The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

Category: Machine Shop

Mechanical widgetry

  • EMC2 HAL Configuration by Eagle Schematics: The Code

    As part of that renaming adventure with the Logitech Gamepad configuration, I realized I hadn’t put my version of Martin Shoeneck’s Eagle-to-HAL conversion script anywhere useful.

    Herewith, the script that you’ll apply to schematics built with parts from the hal-config-2.4.lbr.odt library (which you must rename to get ride of the ODT extension):

    /******************************************************************************
     * HAL-Configurator
     *
     * Author: Martin Schoeneck 2008
     * Additional gates and tweaks: Ed Nisley KE4ZNU 2010
     *****************************************************************************/
    #usage "<h1>HAL-Configurator</h1>Start from a Schematic where symbols from hal-config.lbr are used!";
    
    string output_path =    "./";
    string dev_loadrt =     "LOADRT";
    string dev_loadusr =    "LOADUSR";
    string dev_thread =     "THREAD";
    string dev_parameter =  "PARAMETER";
    
    string dev_names[] = {
    "CONSTANT",								// must be first entry to make set_constants() work
    "ABS",				// 2.4
    "AND2",
    "BLEND",			// 2.4
    "CHARGE-PUMP",		// 2.4
    "COMP",
    "CONV_S32_FLOAT",	// 2.4
    "DDT",				// 2.4
    "DEADZONE",			// 2.4
    "DEBOUNCE",			// 2.4
    "EDGE",
    "ENCODER",			// 2.4
    "ENCODER-RATIO",	// 2.4
    "ESTOP-LATCH",
    "FLIPFLOP",
    "FREQGEN",			// 2.4
    "LOWPASS",
    "MULT2",			// 2.4
    "MUX2",
    "MUX4",				// 2.4
    "MUX8",				// 2.4
    "NEAR",				// 2.4
    "NOT",
    "ONESHOT",
    "OR2",
    "SAMPLER",			// 2.4
    "SCALE",			// 2.4
    "SELECT8",			// 2.4
    "SUM2",
    "TIMEDELAY",		// 2.4
    "TOGGLE",			// 2.4
    "WCOMP",			// 2.4
    "XOR2",				// 2.4
    ""					// end flag
    };
    
    /*******************************************************************************
     * Global Stuff
     ******************************************************************************/
    
    string FileName;
    string ProjectPath;
    string ProjectName;
    
    void Info(string Message) {
    	dlgMessageBox(";<b>Info</b><p>\n" + Message);
    }
    
    void Warn(string Message) {
    	dlgMessageBox("!<b>Warning</b><p>\n" + Message + "<p>see usage");
    }
    
    void Error(string Message) {
    	dlgMessageBox(":<hr><b>Error</b><p>\n" + Message + "<p>see usage");
    	exit(1);
    }
    
    string replace(string str, char a, char b) {
    	// in string str replace a with b
    	int pos = -1;
    	do {
    		// find that character
    		pos = strchr(str, a);
    		// replace if found
    		if(pos >= 0) {
    			str[pos] = b;
    		}
    	} while(pos >= 0);
    
    	return str;
    }
    
    // the part name contains an index and is written in capital letters
    string get_module_name(UL_PART P) {
    	// check module name, syntax: INDEX:NAME
    	string mod_name = strlwr(P.name);
    	// split string at the : if exists
    	string a[];
    	int c = strsplit(a, mod_name, ':');
    	mod_name = a[c-1];
    	// if name starts with '[' we need uppercase letters
    	if(mod_name[0] == '[') {
    		mod_name = strupr(mod_name);
    	}
    
    	return mod_name;
    }
    
    string comment(string mess) {
    	string str = "\n\n####################################################\n";
    	if(mess != "") {
    		str += "# " + mess + "\n";
    	}
    
    	return str;
    }
    
    // if this is a device for loading a module, load it (usr/rt)
    string load_module(UL_PART P) {
    	string str = "";
    
    	// it's a module if the device's name starts with LOADRT/LOADUSR
    	if((strstr(P.device.name, dev_loadrt) == 0) ||
    	   (strstr(P.device.name, dev_loadusr) == 0)) {
    
    		// now add the string to our script
    		str += P.value + "\n";
    	}
    
    	return str;
    }
    
    // count used digital gates (and, or, etc) and load module if neccessary
    string load_blocks() {
    	string str = "";
    
    	int index;
    
    	int dev_counters[];
    	string dname[];
    
    	// count the gates that are used
    	schematic(S) { S.parts(P) {
    		strsplit(dname,P.device.name,'.');		// extract first part of name
    		if ("" != lookup(dev_names,dname[0],0)) {
    			for (index = 0;  (dname[0] != dev_names[index]) ; index++) {
    				continue;
    			}
    			dev_counters[index]++;
    		}
    	} }
    
    // force lowercase module names...
    
    	for (index = 0; ("" != dev_names[index]) ; index++) {
    		if (dev_counters[index]) {
    			sprintf(str,"%sloadrt %s\t\tcount=%d\n",str,strlwr(dev_names[index]),dev_counters[index]);
    		}
    	}
    
    	return str;
    }
    
    string hook_function(UL_NET N) {
    	string str = "";
    
    	// is this net connected to a thread (work as functions here)?
    	int    noclkpins       = 0;
    	string thread_name     = "";  // this net should be connected to a thread
    	string thread_position = "";
    	N.pinrefs(PR) {
    		// this net is connected to a clk-pin
    		if(PR.pin.function == PIN_FUNCTION_FLAG_CLK) {
    			// check the part: is it a thread-device?
    			if(strstr(PR.part.device.name, dev_thread) == 0) {
    				// we need the name of the thread
    				thread_name = strlwr(PR.part.name);
    				// and we need the position (position _ is ignored)
    				thread_position = strlwr(PR.pin.name);
    				thread_position = replace(thread_position, '_', ' ');
    			}
    		} else {
    			// no clk-pin, this is no function-net
    			noclkpins++;
    			break;
    		}
    	}
    
    	// found a thread?
    	if(noclkpins == 0 && thread_name != "") {
    		// all the other pins are interesting now
    		N.pinrefs(PR) {
    			// this pin does not belong to the thread
    			if(strstr(PR.part.device.name, dev_thread) != 0) {
    				// name of the pin is name of the function
    				//string function_name = strlwr(PR.pin.name);
    				string function_name = strlwr(PR.instance.gate.name);
    				// if functionname starts with a '.', it will be appended to the modulename
    				if(function_name[0] == '.') {
    					// if the name is only a point, it will be ignored
    					if(strlen(function_name) == 1) {
    						function_name = "";
    					}
    					function_name = get_module_name(PR.part) + function_name;
    				}
    				str += "addf " + function_name + "\t\t" + thread_name + "\t" + thread_position + "\n";
    			}
    		}
    	}
    
    	return str;
    }
    
    string set_parameter(UL_NET N) {
    	string str = "";
    
    	// is this net connected to a parameter-device?
    	int    nodotpins       = 0;
    	string parameter_value = "";
    	N.pinrefs(PR) {
    		// this net is connected to a dot-pin
    		if(PR.pin.function == PIN_FUNCTION_FLAG_DOT) {
    			// check the part: is it a parameter-device?
    //			str += "** dev name [" + PR.part.device.name + "] [" + dev_parameter + "]\n";
    			if(strstr(PR.part.device.name, dev_parameter) == 0) {
    				// we need the value of that parameter
    				parameter_value = PR.part.value;
    //				str += "**  value [" + PR.part.value +"]\n";
    			}
    		} else {
    			// no clk-pin, this is no function-net
    			nodotpins++;
    			break;
    		}
    	}
    
    	// found a parameter?
    	if(nodotpins == 0 && parameter_value != "") {
    		// all the other pins are interesting now
    		N.pinrefs(PR) {
    //			str += "** dev name [" + PR.part.device.name + "] [" + dev_parameter + "]\n";
    			// this pin does not belong to the parameter-device
    			if(strstr(PR.part.device.name, dev_parameter) != 0) {
    				// name of the pin is name of the function
    				//string parameter_name = strlwr(PR.pin.name);
    				string parameter_name = strlwr(PR.instance.gate.name);
    				// if functionname starts with a '.', it will be appended to the modulename
    //				str += "** param (gate) name [" + parameter_name + "]\n";
    				if(parameter_name[0] == '.') {
    					// if the name is only a point, it will be ignored
    					if(strlen(parameter_name) == 1) {
    						parameter_name = "";
    					}
    					parameter_name = get_module_name(PR.part) + parameter_name;
    //					str += "** param (part) name [" + parameter_name + "]\n";
    				}
    				str += "setp " + parameter_name + "\t" + parameter_value + "\n";
    			}
    		}
    	}
    
    	return str;
    }
    
    // if this is a 'constant'-device, set its value
    // NOTE: this is hardcoded to use the first entry in the dev_names[] array!
    string set_constants(UL_PART P) {
    	string str = "";
    
    	// 'constant'-device?
    	if(strstr(P.device.name, dev_names[0]) == 0) {
    		str += "setp " + get_module_name(P) + ".value\t" + P.value + "\n";
    	}
    
    	return str;
    }
    
    string connect_net(UL_NET N) {
    	string str = "";
    
    	// find all neccessary net-members
    	string pins = "";
    	N.pinrefs(P) {
    		// only non-functional pins are connected
    		if(P.pin.function == PIN_FUNCTION_FLAG_NONE) {
    			string pin_name =  strlwr(P.pin.name);
    			string part_name = strlwr(P.part.name);
    			pin_name =  replace(pin_name,  '$', '_');
    			part_name = replace(part_name, '$', '_');
    			pins += part_name + "." + pin_name + " ";
    		}
    	}
    
    	if(pins != "") {
    		string net_name = strlwr(N.name);
    		net_name = replace(net_name, '$', '_');
    		str += "net " + net_name + " " + pins + "\n";
    	}
    
    	return str;
    }
    
    /*******************************************************************************
     * Main program.
     ******************************************************************************/
    // is the schematic editor running?
    if (!schematic) {
    	Error("No Schematic!<br>This program will only work in the schematic editor.");
    }
    
    schematic(S) {
    	ProjectPath = filedir(S.name);
    	ProjectName = filesetext(filename(S.name), "");
    }
    
    // build configuration
    
    string cs = "# HAL config file automatically generated by Eagle-CAD ULP:\n";
    cs += "# [" + argv[0] + "]\n";
    cs += "# (C) Martin Schoeneck.de 2008\n";
    cs += "# Mods Ed Nisley 2010\n";
    
    FileName = ProjectPath + ProjectName + ".hal";
    
    cs += "# Path        [" + ProjectPath + "]\n";
    cs += "# ProjectName [" + ProjectName + "]\n";
    
    //cs += "# File name: [" + FileName + "]\n\n";
    
    // ask for a filename: where should we write the configuration?
    
    FileName = dlgFileSave("Save Configuration", FileName, "*.hal");
    
    if(!FileName) {
    	exit(0);
    }
    
    cs += "# File name   [" + FileName + "]\n";
    cs += "# Created     [" + t2string(time(),"hh:mm:ss dd-MMM-yyyy") + "]\n\n";
    
    schematic(S) {
    	// load modules
    	cs += comment("Load realtime and userspace modules");
    	S.parts(P) {
    		cs += load_module(P);
    	}
    
    	// load blocks
    	cs += load_blocks();
    
    	// add functions
    	cs += comment("Hook functions into threads");
    	S.nets(N) {
    		cs += hook_function(N);
    	}
    
    	// set parameters
    	cs += comment("Set parameters");
    	S.nets(N) {
    		cs += set_parameter(N);
    	}
    
    	// set constant values
    	cs += comment("Set constants");
    	S.parts(P) {
    		cs += set_constants(P);
    	}
    
    	// build nets and connect them
    	cs += comment("Connect Modules with nets");
    	S.nets(N) {
    		cs += connect_net(N);
    	}
    }
    
    // open/overwrite the target file to save the configuration
    output(FileName, "wt") {
    	printf(cs);
    }
    
  • SX230HS Adapter: Main Tube and Assembly

    The main tube connects the camera mounting plate and the snout on the front, so it’s a structural element of a sort. The ID fits over the non-moving lens turret base on the camera and the inner length is a few millimeters longer than the maximum lens turret extension:

    Camera mount tube - interior
    Camera mount tube – interior

    As you might expect by now, the front bulkhead has four alignment peg holes for the snout:

    Camera mount tube
    Camera mount tube

    The OpenSCAD code sets the wall thickness to 3 thread widths, but Skeinforge prints two adjacent threads with no fill at all. I think the polygon corners eliminate the one-thread-width fill and the perimeter threads wind up near enough to merge properly.

    I assembled snouts to main tubes first, because it was easier to clamp bare cylinders to the bench:

    Microscope eyepiece adapter - snout clamping
    Microscope eyepiece adapter – snout clamping

    Then glue the tube to the mounting plate using a couple of clamps:

    Microscope eyepiece adapter - baseplate clamping
    Microscope eyepiece adapter – baseplate clamping

    The alignment is pretty close to being right, but if when I do this again I’ll add alignment pegs along the trench in the mounting plate to make sure the tube doesn’t ease slightly to one side, thusly:

    SX230HS Macro Lens mount - solid model - exploded with pegs
    SX230HS Macro Lens mount – solid model – exploded with pegs

    You can see the entrance pupil isn’t quite filled in the last picture there, so a bit more attention to detail is in order. A bigger doublet lens would help, too.

    The current version of the OpenSCAD source code with those pegs:

    // Close-up lens mount & Microscope adapter for Canon SX230HS camera
    // Ed Nisley KE4ZNU - Nov 2011
    
    Mount = "LEDRing";			// End result: LEDRing Eyepiece
    
    Layout = "Show";			// Assembly: Show
    							// Parts: Plate Tube LEDRing Camera Eyepiece
    							// Build Plates: Build1..4
    
    Gap = 10;					// between "Show" objects
    
    include </home/ed/Thing-O-Matic/lib/MCAD/units.scad>
    include </home/ed/Thing-O-Matic/Useful Sizes.scad>
    include </home/ed/Thing-O-Matic/lib/visibone_colors.scad>
    
    //-------
    //- Extrusion parameters must match reality!
    //  Print with +1 shells, 3 solid layers, 0.2 infill
    
    ThreadThick = 0.33;
    ThreadWidth = 2.0 * ThreadThick;
    
    HoleFinagle = 0.2;
    HoleFudge = 1.00;
    
    function HoleAdjust(Diameter) = HoleFudge*Diameter + HoleFinagle;
    
    Protrusion = 0.1;			// make holes end cleanly
    
    function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
    
    //-------
    // Dimensions
    
    // doublet lens
    
    LensDia = 25.0;
    LensRad = LensDia/2;
    LensClearance = 0.2;
    
    LensEdge = 6.7;
    LensThick = 8.6;
    LensRimThick = IntegerMultiple((2.0 + LensThick),ThreadThick);
    
    // LED ring light
    
    LEDRingOD = 50.0;
    LEDRingID = 36.0;
    LEDBoardThick = 1.5;
    LEDThick = 4.0;
    LEDRingClearance = 0.5;
    LEDWireHoleDia = 3.0;
    
    // microscope eyepiece
    
    EyepieceOD = 30.0;
    EyepieceID = 24.0;
    EyepieceLength = 25.0;
    
    // camera
    // Origin at base of [0] ring, Z+ along lens axis, X+ toward bottom, Y+ toward left
    
    CameraBodyWidth = 2*10.6;							// 2 x center-to-curve edge
    CameraBaseWidth = 15.5;								// flat part of bottom front to back
    CameraBaseRadius = (CameraBodyWidth - CameraBaseWidth)/2;	// edge rounding
    CameraBaseLength = 60.0;							// centered on lens axis
    CameraBaseHeight = 55.0;							// main body height
    CameraBaseThick = 0.9;								// downward from lens ring
    
    echo(str("Camera base radius: ",CameraBaseRadius));
    
    TripodHoleOffset = -19.0;							// mount screw wrt lens centerline
    TripodHoleDia = Clear025_20;						// clearance hole
    
    TripodScrewHeadDia = 14.5;							// recess for screw mounting camera
    TripodScrewHeadRad = TripodScrewHeadDia/2;
    TripodScrewHeadThick = 3.0;
    
    // main lens tube
    
    TubeDia = 		[53.0,	44.0,	40.0,	37.6];		// lens rings, [0] is fixed to body
    TubeLength = 	[8.1,	20.6,	17.6,	12.7];
    
    TubeEndClearance = 2.0;								// camera lens end to tube end
    TubeEndThickness = IntegerMultiple(1.5,ThreadThick);
    TubeInnerClearance = 0.5;
    
    TubeInnerLength = TubeLength[0] + TubeLength[1] + TubeLength[2] + TubeLength[3] +
    				  TubeEndClearance;
    TubeOuterLength = TubeInnerLength + TubeEndThickness;
    
    TubeID = TubeDia[0] + TubeInnerClearance;
    TubeOD = TubeID + 6*ThreadWidth;
    TubeWall = (TubeOD - TubeID)/2;
    TubeSides = 48;
    
    echo(str("Main tube outer length: ",TubeOuterLength));
    echo(str("          ID: ",TubeID," OD: ",TubeOD," wall: ",TubeWall));
    
    // camera mounting base
    
    BaseWidth = IntegerMultiple((CameraBaseWidth + 2*CameraBaseRadius),ThreadThick);
    BaseLength = 60.0;
    BaseThick = IntegerMultiple((1.0 + Nut025_20Thick + CameraBaseThick),ThreadThick);
    
    // LED ring mount
    
    LEDBaseThick = IntegerMultiple(2.0,ThreadThick);	// base under lens + LED ring
    LEDBaseRimWidth = IntegerMultiple(6.0,ThreadWidth);
    LEDBaseRimThick = IntegerMultiple(LensThick,ThreadThick);
    
    LEDBaseOD = max((LEDRingOD + LEDRingClearance + LEDBaseRimWidth),TubeOD);
    
    echo(str("LED Ring OD: ",LEDBaseOD));
    
    // alignment pins between tube and LED ring / microscope eyepiece
    
    AlignPinOD = 2.9;
    
    SnoutPins = 4;
    SnoutPinCircleDia = TubeOD - 2*TubeWall - 2*AlignPinOD;		// 2*PinOD -> more clearance
    
    // alignment pins between tube and base plate
    
    BasePins = 2;
    BasePinOffset = 10.0;
    BasePinSpacing = BaseLength/3;
    
    //-------
    
    module PolyCyl(Dia,Height,ForceSides=0) {			// based on nophead's polyholes
    
      Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
    
      FixDia = Dia / cos(180/Sides);
    
      cylinder(r=HoleAdjust(FixDia)/2,h=Height,$fn=Sides);
    }
    
    module ShowPegGrid(Space = 10.0,Size = 1.0) {
    
      Range = floor(50 / Space);
    
    	for (x=[-Range:Range])
    	  for (y=[-Range:Range])
    		translate([x*Space,y*Space,Size/2])
    		  %cube(Size,center=true);
    
    }
    
    //-------
    
    //- Camera body segment
    //	Including lens base and peg for tripod hole access
    //	Z=0 at edge of lens base ring, X=0 along lens axis
    
    module CameraBody() {
    
      translate([0,0,-CameraBaseThick])
    	rotate(90)
    	  union() {
    		translate([0,0,(CameraBaseHeight/2 + CameraBaseRadius)])
    		  minkowski() {
    			cube([CameraBaseWidth,
    				  (CameraBaseLength + 2*Protrusion),
    				  CameraBaseHeight],center=true);
    			rotate([90,0,0])
    			  cylinder(r=CameraBaseRadius,h=Protrusion,$fn=8);
    		  }
    
    		translate([0,0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			rotate(180/TubeSides)
    			  cylinder(r=(TubeDia[0]/2 + CameraBaseThick),
    					  h=(CameraBodyWidth/2 + Protrusion),
    					  $fn=TubeSides);
    
    		translate([CameraBodyWidth/2,0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[0]/2,h=TubeLength[0]);
    
    		translate([(TubeLength[0] + CameraBodyWidth/2),
    				  0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[1]/2,h=TubeLength[1]);
    
    		translate([(TubeLength[0] + TubeLength[1] + CameraBodyWidth/2),
    				  0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[2]/2,h=TubeLength[2]);
    
    		translate([(TubeLength[0] + TubeLength[1] + TubeLength[2] + CameraBodyWidth/2),
    				  0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[3]/2,h=TubeLength[3]);
    
    		translate([0,TripodHoleOffset,-BaseThick])
    		  PolyCyl(TripodHoleDia,(BaseThick + 2*Protrusion));
    
    	  }
    }
    
    //- Main tube
    
    module Tube() {
    
      difference() {
    	cylinder(r=TubeOD/2,h=TubeOuterLength,$fn=TubeSides);
    
    	translate([0,0,TubeEndThickness])
    	  PolyCyl(TubeID,(TubeInnerLength + Protrusion),TubeSides);
    
    	translate([0,0,-Protrusion]) {
    	  if (Mount == "LEDRing")
    		cylinder(r=LensRad,h=(TubeEndThickness + 2*Protrusion));
    	  if (Mount == "Eyepiece")
    		cylinder(r=EyepieceID/2,h=(TubeEndThickness + 2*Protrusion));
    	}
    
    	for (Index = [0:SnoutPins-1])
    	  rotate(Index*90)
    		translate([(SnoutPinCircleDia/2),0,-ThreadThick])
    		  rotate(180)			// flat sides outward
    			PolyCyl(AlignPinOD,TubeEndThickness);
    
    	for (Index = [0:BasePins-1])
    		translate([0,-(TubeOD/2 + Protrusion),
    				  (TubeOuterLength - BasePinOffset - Index*BasePinSpacing)])
    		  rotate([-90,90,0])					// y = flat toward camera
    			PolyCyl(AlignPinOD,(TubeWall + 2*Protrusion));
      }
    
    }
    
    //- Base plate
    
    module BasePlate() {
    
      union() {
    	difference() {
    		linear_extrude(height=BaseThick)
    		  hull() {
    			translate([-(BaseLength/2 - BaseWidth/2),0,0])
    			  circle(BaseWidth/2);
    			translate([ (BaseLength/2 - BaseWidth/2),0,0])
    			  circle(BaseWidth/2);
    			translate([0,(0.75*BaseLength),0])
    			  circle(BaseWidth/2);
    		  }
    
    		translate([0,0,BaseThick])
    		  CameraBody();
    
    		translate([0,(TubeOuterLength + CameraBodyWidth/2),
    				  (BaseThick + TubeDia[0]/2)])
    		  rotate([90,0,0])
    			PolyCyl(TubeOD,TubeOuterLength,$fn=TubeSides);
    
    		for (Index = [0:BasePins-1])
    			translate([0,(CameraBodyWidth/2 + BasePinOffset + Index*BasePinSpacing),
    					  3*ThreadThick])
    			  rotate(90)										// flat toward camera
    				PolyCyl(AlignPinOD,BaseThick);
    
    		translate([0,0,3*ThreadThick])
    		  PolyCyl((Nut025_20Dia*sqrt(3)/2),2*Nut025_20Thick,6);	// dia across hex flats
    
    		translate([0,0,-Protrusion])
    		  PolyCyl(Clear025_20,(BaseThick + 2*Protrusion));
    
    		translate([TripodHoleOffset,0,3*ThreadThick])
    		  PolyCyl((Nut025_20Dia*sqrt(3)/2),2*Nut025_20Thick,6);	// dia across hex flats
    
    		translate([TripodHoleOffset,0,-Protrusion])
    		  PolyCyl(Clear025_20,(BaseThick + 2*Protrusion));
    
    		translate([-TripodHoleOffset,0,-Protrusion])
    		  PolyCyl(TripodScrewHeadDia,(TripodScrewHeadThick + Protrusion));
    	}
    
    	translate([-TripodHoleOffset,0,0]) {				// support for tripod screw hole
    	  for (Index=[0:3])
    		rotate(Index*45)
    		  translate([-ThreadWidth,-TripodScrewHeadRad,0])
    			cube([2*ThreadWidth,TripodScrewHeadDia,TripodScrewHeadThick]);
    
    	  cylinder(r=0.4*TripodScrewHeadRad,h=(BaseThick - CameraBaseThick),$fn=9);
    	}
      }
    }
    
    //- LED mounting ring
    
    module LEDRing() {
    
      difference() {
    	cylinder(r=LEDBaseOD/2,h=LensRimThick,$fn=48);
    
    	translate([0,0,-Protrusion])
    	  PolyCyl((LensDia + LensClearance),
    			  (LensRimThick + 2*Protrusion));
    
    	translate([0,0,LEDBaseRimThick])
    	  difference() {
    		PolyCyl(LEDBaseOD,LensThick);
    		PolyCyl(LEDRingID,LensThick);
    	  }
    
    	translate([0,0,LEDBaseThick])
    	  difference() {
    		PolyCyl((LEDRingOD + LEDRingClearance),LensThick);
    		cylinder(r1=HoleAdjust(LEDRingID - LEDRingClearance)/2,
    				 r2=HoleAdjust(LensDia + LensClearance)/2 + 2*ThreadWidth,
    				 h=LensThick);
    	  }
    
    	for (Index = [0:SnoutPins-1])
    	  rotate(Index*90)
    		translate([(SnoutPinCircleDia/2),0,-ThreadThick])
    		  rotate(180)			// flat sides outward
    			PolyCyl(AlignPinOD,LEDBaseThick);
    
    	rotate(45)
    	  translate([0,LEDRingID/2,(LEDBaseThick + 1.2*LEDWireHoleDia/2)])
    		rotate([0,-90,0])			// flat side down
    		  rotate([-90,0,0])
    			PolyCyl(LEDWireHoleDia,2*LEDBaseRimWidth);
      }
    
    }
    
    //- Microscope eyepiece adapter
    
    module EyepieceMount() {
    
      difference() {
    	cylinder(r1=TubeOD/2,
    			 r2=(EyepieceOD + 8*ThreadWidth)/2,
    			 h=EyepieceLength,
    			 $fn=TubeSides);
    
    	translate([0,0,-Protrusion])
    	  PolyCyl(EyepieceOD,(EyepieceLength + 2*Protrusion));
    
    	for (Index = [0:SnoutPins-1])
    	  rotate(Index*90)
    		translate([(SnoutPinCircleDia/2),0,-ThreadThick])
    		  rotate(180)			// flat sides outward
    			PolyCyl(AlignPinOD,6*ThreadThick);
      }
    
    }
    
    //-------
    // Build it!
    
    if (Layout != "Show")
      ShowPegGrid();
    
    if (Layout == "Tube")
      Tube();
    
    if (Layout == "LEDRing")
      LEDRing();
    
    if (Layout == "Plate")
      BasePlate();
    
    if (Layout == "Camera")
      CameraBody();
    
    if (Layout == "Eyepiece")
      EyepieceMount();
    
    if (Layout == "Build1")
      translate([0,-BaseLength/3,0])
    	BasePlate();
    
    if (Layout == "Build2")
      Tube();
    
    if (Layout == "Build3")
      LEDRing();
    
    if (Layout == "Build4")
      EyepieceMount();
    
    if (Layout == "Show") {
      translate([0,TubeOuterLength,TubeDia[0]/2]) {
    	rotate([90,0,0])
    	  color(LTC) Tube();
    	translate([0,(Gap/2 - TubeEndThickness - Protrusion),0])
    	  rotate([-90,0,0])
    		for (Index = [0:SnoutPins-1])
    		  rotate(Index*90)
    			translate([(SnoutPinCircleDia/2),0,0])
    			  rotate(180)			// flat sides outward
    				PolyCyl(AlignPinOD,(TubeEndThickness + LEDBaseThick));
    
    	translate([0,Gap,0])
    	  rotate([-90,0,0]) {
    		if (Mount == "LEDRing")
    		  color(OOR) LEDRing();
    		if (Mount == "Eyepiece")
    		  color(OOR) EyepieceMount();
    	  }
      }
    
      translate([0,-CameraBodyWidth/2,0])
    	color(PG) CameraBody();
    
      color(PDA)
    	render()
    	translate([0,-CameraBodyWidth/2,-(BaseThick + Gap)])
    	  BasePlate();
    
      for (Index = [0:BasePins-1])
    	  translate([0,(BasePinOffset + Index*BasePinSpacing),
    				-Gap/2])
    		rotate([180,0,90])										// flat toward camera
    		  PolyCyl(AlignPinOD,BaseThick/2);
    
    }
    
  • SX230HS Adapter: Microscope Snout

    The microscope eyepiece adapter was easy enough: a cone with a cylinder punched out of it:

    Microscope eyepiece adapter - front view
    Microscope eyepiece adapter – front view

    The thin part of the tip is four threads wide around the eyepiece OD, which makes for good fill.

    The bottom has the usual four alignment pin holes:

    Microscope eyepiece adapter - bottom view
    Microscope eyepiece adapter – bottom view

    The main tube opening ID is equal to the diameter of the flat rim around the microscope eyepiece, which provides a positive stop with plenty of surface area.

    It looks about like you’d expect on the microscope, with the LED ring light from Planet Barbie around the objective lenses:

    SX230HS on microscope
    SX230HS on microscope

    The lowest magnification is much higher than I expected; it’s about 2.5 mm across. This is a 1206 SMD resistor:

    Microscope adapter - minimum magnification
    Microscope adapter – minimum magnification

    The highest magnification shows details of a laser etched numeral:

    Microscope adapter - maximum magnification
    Microscope adapter – maximum magnification

    The alignment obviously isn’t up to par and I think the exposure needs some work. All in all, though, it’s usable as-is.

  • SX230HS Adapter: Macro Lens Snout

    The macro lens adapter took shape around a nice 25 mm doublet lens from the Box o’ Lenses. The Canon SX230HS has a lens opening that’s just about 25 mm in diameter and a larger lens would be better, but at maximum zoom the image pretty much fills the camera’s entrance pupil. I ordered a pair of 50 mm LED ring lights from halfway around the planet and built the snout to hold the ring around the lens:

    Macro lens snout with LED ring light
    Macro lens snout with LED ring light

    That’s the first pass to get the sizes right and work out some details. In particular, that small white ring inside the aperture below the lens didn’t work at all, so I made the main tube opening a bit smaller.

    The solid model shows the details a bit better:

    Macro adapter snout - solid model - front view
    Macro adapter snout – solid model – front view

    The inner cone shields the lens edges from (most of the) scattered LED light. I considered angling the side walls to concentrate the ring light, but wasn’t convinced it’d be worth the effort because the LEDs have such a broad beamwidth anyway. The little hole is for the LED power cable, which goes to a 12 V switching wall wart. The 5 strings of 3 LEDs draw about 70 mA, which suggests I should hack the ballast resistors down a bit to boost the current up to 20 mA per string. FWIW, the resistors give 25 mA per string at 13.8 V, so I could probably goose the current a lot higher.

    The bottom has four shallow holes for the alignment pegs cut from ABS filament:

    Macro adapter snout - solid model - bottom view
    Macro adapter snout – solid model – bottom view

    The hole in the front end of the main tube is marginally smaller than the lens diameter, as I used the OpenSCAD cylinder primitive instead of the PolyCyl module that slightly enlarges holes to make the answer come out right. The difference is just enough to form a solid stop that aligns the lens and prevents it from sliding into the body before the glue cures.

    The whole affair looks pretty scary from the victim’s point of view:

    SX230HS macro adapter LED ring light - front view
    SX230HS macro adapter LED ring light – front view

    But the camera’s view seems OK, albeit with some vignetting:

    Canon NB-5L battery through macro lens adapter
    Canon NB-5L battery through macro lens adapter

    Limited by vignetting & entrance pupil filling, zooming controls the horizontal subject size from 25 mm to about 10 mm. Depth of field is a few mm, at best; the printing on the far end of that battery is fuzzier than it seems.

    Best results so far come from:

    • Manual aperture at f/8
    • Manual focus at infinity (move the subject to focus)
    • Shutter delay = 2 seconds to let the camera stop shaking
  • SX230HS Adapter: Mounting Screws

    The microscope adapter needs a single screw to hold the camera to the mount. I used the same aluminum knob as on the adapter for my previous camera, shortening the screw so it didn’t bottom out in the camera socket:

    Shortened camera mount knob screw
    Shortened camera mount knob screw

    The boss is slightly shorter than the recess, so the knob body seats on the plate and works like this:

    SX230HS microscope adapter - side view
    SX230HS microscope adapter – side view

    When the camera isn’t on the adapter, the screw stores neatly in the 1/4-20 nut sunk in the middle of the mounting plate.

    Although I can hand-hold the macro lens adapter, it’s much more stable on a real tripod. That requires a flat camera-mount screw that sits within the recess so the mounting plate can sit flush atop the tripod head:

    Camera mount plate with screw - bottom view
    Camera mount plate with screw – bottom view

    However, it’ll be much easier to use the knob screw when I’m hand-holding the thing, so I drilled-and-tapped a hole in the knob for a place to store the flat screw when it’s not in use:

    Camera mounting screws - end view
    Camera mounting screws – end view

    The threads in the knob don’t go quite far enough to seat the screw head against the knob, but that crude hack wouldn’t work in aluminum. Fortunately, it doesn’t matter:

    Camera mounting screws - joined
    Camera mounting screws – joined

    This being a low-torque application, I filed the top off the already-pretty-flat truss head so the mounting plate recess didn’t have to be all that deep.

    The knob+screw stores in the 1/4-20 nut between uses, too:

    Knob and screw stored in macro adapter
    Knob and screw stored in macro adapter

    Yeah, yellow probably isn’t appropriate for an optical structure; I’ll shoot a black rattle-can coat inside there after the weather warms up…

  • SX230HS Adapter: Mounting Plate

    The Canon SX230HS tripod mounting screw sits offset from the lens axis, presumably because there’s no way to jam the screw socket under all the machinery that retracts the lens turret. I laid out the mounting plate as a round-cornered triangle with a 1/4-20 clearance hole for the screw that holds the camera to the plate and a 1/4-20 nut sunk under the lens axis for a tripod screw. The main adapter tube supporting the microscope mount or macro lens holder glues into the shallow trench:

    Camera mount baseplate - top view
    Camera mount baseplate – top view

    The barely visible trench along the back edge matches the bottom of the camera closely enough to align it against the main tube. This exploded view shows how that works:

    Mounting plate camera interface - solid model
    Mounting plate camera interface – solid model

    In fact, that trench and the hole under the camera’s tripod socket come from subtracting the whole camera model from the mounting plate. I added the fully extended lens turret just for completeness; the body is no wider then necessary to carve that trench:

    Canon SX230HS Camera - solid model
    Canon SX230HS Camera – solid model

    The Z=0 plane cuts through the top of the curved bottom shell to simplify the subtraction. The post diameter clears the 1/4-20 tripod screw and is long enough to punch through the mounting plate.

    The bottom view shows the recess for the camera tripod screw head, with the support material (which blocks the hole in the picture above) removed:

    Camera mount baseplate - support removed
    Camera mount baseplate – support removed

    It looks like this with the support plug in place:

    Camera mount baseplate - bottom view - with support
    Camera mount baseplate – bottom view – with support

    Removing the support plug involves twisting the legs with a needle-nose pliers.

    The yellow layer comes from switching colors in mid-print, but it certainly adds some much-needed contrast to the image.

    The OpenSCAD code there sinks a second 1/4-20 nut that might be useful for an offset tripod mount if you need such a thing.

  • Canon SX230HS Microscope and Close-up Macro Adapters

    The deal was, if my Shop Assistant repaired my pocket camera, she could have it. She did, which meant I lost the ability to take pix through the microscope. While I was conjuring up a replacement, it occurred to me that I should also build a gadget to hold a close-up lens in front of the camera for tighter macro shots that don’t quite require a microscope’s magnification.

    The solid model of the microscope adapter:

    Microscope mount - solid model
    Microscope mount – solid model

    The close-up macro adapter, with an LED ring light around the snout:

    LED Ring mount - solid model
    LED Ring mount – solid model

    They have a common camera mounting plate, with a hex recess for a 1/4-20 nut that mates with a standard tripod screw and some support material sticking up through the hole for the screw that holds the camera to the plate:

    Mounting plate - solid model - top view
    Mounting plate – solid model – top view

    The main tube glues into the plate’s cutout and is long enough to accommodate the fully extended lens turret, with four shallow holes for filament snippet locating pins to align the snout:

    Main tube - solid model - bottom view
    Main tube – solid model – bottom view

    An exploded view shows how everything fits together, with the stud below the camera representing its tripod mounting screw:

    LED Ring mount - solid model - exploded view
    LED Ring mount – solid model – exploded view

    More details on the parts will appear over the next few days, but here’s the view through the macro adapter:

    Dahlia through macro adapter
    Dahlia through macro adapter

    Yeah, some slight vignetting, but overall it’s pretty good.

    The OpenSCAD source code that builds both adapters:

    // Close-up lens mount & Microscope adapter for Canon SX230HS camera
    // Ed Nisley KE4ZNU - Nov 2011
    
    Mount = "Eyepiece";			// End result: LEDRing Eyepiece
    
    Layout = "Show";			// Assembly: Show
    							// Parts: Plate Tube LEDRing Camera Eyepiece
    							// Build Plates: Build1..4
    
    Gap = 12;					// between "Show" objects
    
    include </home/ed/Thing-O-Matic/lib/MCAD/units.scad>
    include </home/ed/Thing-O-Matic/Useful Sizes.scad>
    include </home/ed/Thing-O-Matic/lib/visibone_colors.scad>
    
    //-------
    //- Extrusion parameters must match reality!
    //  Print with +1 shells, 3 solid layers, 0.2 infill
    
    ThreadThick = 0.33;
    ThreadWidth = 2.0 * ThreadThick;
    
    HoleFinagle = 0.2;
    HoleFudge = 1.02;
    
    function HoleAdjust(Diameter) = HoleFudge*Diameter + HoleFinagle;
    
    Protrusion = 0.1;			// make holes end cleanly
    
    function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
    
    //-------
    // Dimensions
    
    // doublet lens
    
    LensDia = 25.0;
    LensRad = LensDia/2;
    LensClearance = 0.2;
    
    LensEdge = 6.7;
    LensThick = 8.6;
    LensRimThick = IntegerMultiple((2.0 + LensThick),ThreadThick);
    
    // LED ring light
    
    LEDRingOD = 50.0;
    LEDRingID = 36.0;
    LEDBoardThick = 1.5;
    LEDThick = 4.0;
    LEDRingClearance = 0.5;
    LEDWireHoleDia = 3.0;
    
    // microscope eyepiece
    
    EyepieceOD = 30.0;
    EyepieceID = 24.0;
    EyepieceLength = 25.0;
    
    // camera
    // Origin at base of [0] ring, Z+ along lens axis, X+ toward bottom, Y+ toward left
    
    CameraBodyWidth = 2*10.6;							// 2 x center-to-curve edge
    CameraBaseWidth = 15.5;								// flat part of bottom front to back
    CameraBaseRadius = (CameraBodyWidth - CameraBaseWidth)/2;	// edge rounding
    CameraBaseLength = 60.0;							// centered on lens axis
    CameraBaseHeight = 55.0;							// main body height
    CameraBaseThick = 0.9;								// downward from lens ring
    
    echo(str("Camera base radius: ",CameraBaseRadius));
    
    TripodHoleOffset = -19.0;							// mount screw wrt lens centerline
    TripodHoleDia = Clear025_20;						// clearance hole
    
    TripodScrewHeadDia = 14.5;							// recess for screw mounting camera
    TripodScrewHeadRad = TripodScrewHeadDia/2;
    TripodScrewHeadThick = 3.0;
    
    // main lens tube
    
    TubeDia = 		[53.0,	44.0,	40.0,	37.6];		// lens rings, [0] is fixed to body
    TubeLength = 	[8.1,	20.6,	17.6,	12.7];
    
    TubeEndClearance = 2.0;								// camera lens end to tube end
    TubeEndThickness = IntegerMultiple(1.5,ThreadThick);
    TubeInnerClearance = 0.5;
    
    TubeInnerLength = TubeLength[0] + TubeLength[1] + TubeLength[2] + TubeLength[3] +
    				  TubeEndClearance;
    TubeOuterLength = TubeInnerLength + TubeEndThickness;
    
    TubeID = TubeDia[0] + TubeInnerClearance;
    TubeOD = TubeID + 6*ThreadWidth;
    TubeWall = (TubeOD - TubeID)/2;
    TubeSides = 48;
    
    echo(str("Main tube outer length: ",TubeOuterLength));
    echo(str("          ID: ",TubeID," OD: ",TubeOD," wall: ",TubeWall));
    
    // camera mounting base
    
    BaseWidth = IntegerMultiple((CameraBaseWidth + 2*CameraBaseRadius),ThreadThick);
    BaseLength = 60.0;
    BaseThick = IntegerMultiple((1.0 + Nut025_20Thick + CameraBaseThick),ThreadThick);
    
    // LED ring mount
    
    LEDBaseThick = IntegerMultiple(2.0,ThreadThick);	// base under lens + LED ring
    LEDBaseRimWidth = IntegerMultiple(6.0,ThreadWidth);
    LEDBaseRimThick = IntegerMultiple(LensThick,ThreadThick);
    
    LEDBaseOD = max((LEDRingOD + LEDRingClearance + LEDBaseRimWidth),TubeOD);
    
    echo(str("LED Ring OD: ",LEDBaseOD));
    
    // alignment pins between tube and LED ring / microscope eyepiece
    
    AlignPins = 4;
    AlignPinOD = 2.9;
    AlignPinCircleDia = TubeOD - 2*TubeWall - 2*AlignPinOD;		// 2*PinOD -> more clearance
    
    //-------
    
    module PolyCyl(Dia,Height,ForceSides=0) {			// based on nophead's polyholes
    
      Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2);
    
      FixDia = Dia / cos(180/Sides);
    
      cylinder(r=HoleAdjust(FixDia)/2,h=Height,$fn=Sides);
    }
    
    module ShowPegGrid(Space = 10.0,Size = 1.0) {
    
      Range = floor(50 / Space);
    
    	for (x=[-Range:Range])
    	  for (y=[-Range:Range])
    		translate([x*Space,y*Space,Size/2])
    		  %cube(Size,center=true);
    
    }
    
    //-------
    
    //- Camera body segment
    //	Including lens base and peg for tripod hole access
    //	Z=0 at edge of lens base ring, X=0 along lens axis
    
    module CameraBody() {
    
      translate([0,0,-CameraBaseThick])
    	rotate(90)
    	  union() {
    		translate([0,0,(CameraBaseHeight/2 + CameraBaseRadius)])
    		  minkowski() {
    			cube([CameraBaseWidth,
    				  (CameraBaseLength + 2*Protrusion),
    				  CameraBaseHeight],center=true);
    			rotate([90,0,0])
    			  cylinder(r=CameraBaseRadius,h=Protrusion,$fn=8);
    		  }
    
    		translate([0,0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			rotate(180/TubeSides)
    			  cylinder(r=(TubeDia[0]/2 + CameraBaseThick),
    					  h=(CameraBodyWidth/2 + Protrusion),
    					  $fn=TubeSides);
    
    		translate([CameraBodyWidth/2,0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[0]/2,h=TubeLength[0]);
    
    		translate([(TubeLength[0] + CameraBodyWidth/2),
    				  0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[1]/2,h=TubeLength[1]);
    
    		translate([(TubeLength[0] + TubeLength[1] + CameraBodyWidth/2),
    				  0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[2]/2,h=TubeLength[2]);
    
    		translate([(TubeLength[0] + TubeLength[1] + TubeLength[2] + CameraBodyWidth/2),
    				  0,(TubeDia[0]/2 + CameraBaseThick)])
    		  rotate([0,90,0])
    			cylinder(r=TubeDia[3]/2,h=TubeLength[3]);
    
    		translate([0,TripodHoleOffset,-BaseThick])
    		  PolyCyl(TripodHoleDia,(BaseThick + 2*Protrusion));
    
    	  }
    }
    
    //- Main tube
    
    module Tube() {
    
      difference() {
    	cylinder(r=TubeOD/2,h=TubeOuterLength,$fn=TubeSides);
    
    	translate([0,0,TubeEndThickness])
    	  PolyCyl(TubeID,(TubeInnerLength + Protrusion),TubeSides);
    
    	translate([0,0,-Protrusion]) {
    	  if (Mount == "LEDRing")
    		cylinder(r=LensRad,h=(TubeEndThickness + 2*Protrusion));
    	  if (Mount == "Eyepiece")
    		cylinder(r=EyepieceID/2,h=(TubeEndThickness + 2*Protrusion));
    	}
    
    	for (Index = [0:AlignPins-1])
    	  rotate(Index*90)
    		translate([(AlignPinCircleDia/2),0,-ThreadThick])
    		  rotate(180)			// flat sides outward
    			PolyCyl(AlignPinOD,TubeEndThickness);
      }
    
    }
    
    //- Base plate
    
    module BasePlate() {
    
      union() {
    	difference() {
    		linear_extrude(height=BaseThick)
    		  hull() {
    			translate([-(BaseLength/2 - BaseWidth/2),0,0])
    			  circle(BaseWidth/2);
    			translate([ (BaseLength/2 - BaseWidth/2),0,0])
    			  circle(BaseWidth/2);
    			translate([0,(0.75*BaseLength),0])
    			  circle(BaseWidth/2);
    		  }
    
    		translate([0,0,BaseThick])
    		  CameraBody();
    
    		translate([0,(TubeOuterLength + CameraBodyWidth/2),
    				  (BaseThick + TubeDia[0]/2)])
    		  rotate([90,0,0])
    			PolyCyl(TubeOD,TubeOuterLength,$fn=TubeSides);
    
    		translate([0,0,3*ThreadThick])
    		  PolyCyl((Nut025_20Dia*sqrt(3)/2),2*Nut025_20Thick,6);	// dia across hex flats
    
    		translate([0,0,-Protrusion])
    		  PolyCyl(Clear025_20,(BaseThick + 2*Protrusion));
    
    		translate([TripodHoleOffset,0,3*ThreadThick])
    		  PolyCyl((Nut025_20Dia*sqrt(3)/2),2*Nut025_20Thick,6);	// dia across hex flats
    
    		translate([TripodHoleOffset,0,-Protrusion])
    		  PolyCyl(Clear025_20,(BaseThick + 2*Protrusion));
    
    		translate([-TripodHoleOffset,0,-Protrusion])
    		  PolyCyl(TripodScrewHeadDia,(TripodScrewHeadThick + Protrusion));
    
    	}
    
    	translate([-TripodHoleOffset,0,0]) {				// support for tripod screw hole
    	  for (Index=[0:3])
    		rotate(Index*45)
    		  translate([-ThreadWidth,-TripodScrewHeadRad,0])
    			cube([2*ThreadWidth,TripodScrewHeadDia,TripodScrewHeadThick]);
    
    	  cylinder(r=0.4*TripodScrewHeadRad,h=(BaseThick - CameraBaseThick),$fn=9);
    	}
      }
    }
    
    //- LED mounting ring
    
    module LEDRing() {
    
      difference() {
    	cylinder(r=LEDBaseOD/2,h=LensRimThick,$fn=48);
    
    	translate([0,0,-Protrusion])
    	  PolyCyl((LensDia + LensClearance),
    			  (LensRimThick + 2*Protrusion));
    
    	translate([0,0,LEDBaseRimThick])
    	  difference() {
    		PolyCyl(LEDBaseOD,LensThick);
    		PolyCyl(LEDRingID,LensThick);
    	  }
    
    	translate([0,0,LEDBaseThick])
    	  difference() {
    		PolyCyl((LEDRingOD + LEDRingClearance),LensThick);
    		cylinder(r1=HoleAdjust(LEDRingID - LEDRingClearance)/2,
    				 r2=HoleAdjust(LensDia + LensClearance)/2 + 2*ThreadWidth,
    				 h=LensThick);
    	  }
    
    	for (Index = [0:AlignPins-1])
    	  rotate(Index*90)
    		translate([(AlignPinCircleDia/2),0,-ThreadThick])
    		  rotate(180)			// flat sides outward
    			PolyCyl(AlignPinOD,LEDBaseThick);
    
    	rotate(45)
    	  translate([0,LEDRingID/2,(LEDBaseThick + 1.2*LEDWireHoleDia/2)])
    		rotate([0,-90,0])			// flat side down
    		  rotate([-90,0,0])
    			PolyCyl(LEDWireHoleDia,2*LEDBaseRimWidth);
      }
    
    }
    
    //- Microscope eyepiece adapter
    
    module EyepieceMount() {
    
      difference() {
    	cylinder(r1=TubeOD/2,
    			 r2=(EyepieceOD + 8*ThreadWidth)/2,
    			 h=EyepieceLength,
    			 $fn=TubeSides);
    
    	translate([0,0,-Protrusion])
    	  PolyCyl(EyepieceOD,(EyepieceLength + 2*Protrusion));
    
    	for (Index = [0:AlignPins-1])
    	  rotate(Index*90)
    		translate([(AlignPinCircleDia/2),0,-ThreadThick])
    		  rotate(180)			// flat sides outward
    			PolyCyl(AlignPinOD,6*ThreadThick);
      }
    
    }
    
    //-------
    // Build it!
    
    if (Layout != "Show")
      ShowPegGrid();
    
    if (Layout == "Tube")
      Tube();
    
    if (Layout == "LEDRing")
      LEDRing();
    
    if (Layout == "Plate")
      BasePlate();
    
    if (Layout == "Camera")
      CameraBody();
    
    if (Layout == "Eyepiece")
      EyepieceMount();
    
    if (Layout == "Build1")
      translate([0,-BaseLength/3,0])
    	BasePlate();
    
    if (Layout == "Build2")
      Tube();
    
    if (Layout == "Build3")
      LEDRing();
    
    if (Layout == "Build4")
      EyepieceMount();
    
    if (Layout == "Show") {
      translate([0,TubeOuterLength,TubeDia[0]/2]) {
    	rotate([90,0,0])
    	  color(LTC) Tube();
    	translate([0,Gap,0])
    	  rotate([-90,0,0]) {
    		if (Mount == "LEDRing")
    		  color(OOR) LEDRing();
    		if (Mount == "Eyepiece")
    		  color(OOR) EyepieceMount();
    	  }
      }
    
      translate([0,-CameraBodyWidth/2,0])
    	color(PG) CameraBody();
    
      color(PDA)
    	render()
    	translate([0,-CameraBodyWidth/2,-(BaseThick + Gap)])
    	  BasePlate();
    }
    

    The original doodles & dimensions:

    Close-up Lens Doodles
    Close-up Lens Doodles