The New Hotness

This will eventually end up on a board supporting the GRBL controller box:

Control Box - Connector Mount - Slic3r — Control Box – Connector Mount – Slic3r

It’s a direct cut-n-paste descendant of the old NEMA motor mount.

The nut threads onto the connector behind the bulkhead, so you must either wire it in place or make very sure you can feed all the terminations through the hole:

Given the previous hairball, I think in-situ soldering has a lot to recommend it:

The OpenSCAD source code as a GitHub Gist:

	// Circular connector bracket
	// Ed Nisley KE4ZNU 2018-02-22

	//– Extrusion parameters

	ThreadThick = 0.25;
	ThreadWidth = 0.4;

	HoleWindage = 0.3; // enlarge hole dia by this amount

	function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);

	Protrusion = 0.1; // make holes look good and joints intersect properly

	//– Useful sizes

	inch = 25.4;

	Tap10_32 = 0.159 * inch;
	Clear10_32 = 0.190 * inch;
	Head10_32 = 0.373 * inch;
	Head10_32Thick = 0.110 * inch;
	Nut10_32Dia = 0.433 * inch;
	Nut10_32Thick = 0.130 * inch;

	ID = 0;
	OD = 1;
	LENGTH = 2;

	//– Mount Sizes

	Connector = [14.6,15.5,4.0]; // connector thread; ID = dia at flat
	Screw = [5.1,10.0,3.0]; // screw size, more-or-less 10-32, OD & LENGTH for head

	MountWidth = IntegerMultiple(2*Connector[OD],ThreadWidth); // use BCD for motor clearance
	MountThick = IntegerMultiple(Connector[LENGTH],ThreadThick); // for stiffness

	WallThick = 3.0; // default wall thickness

	StandThick = IntegerMultiple(WallThick,ThreadWidth); // baseplate
	StrutThick = IntegerMultiple(WallThick,ThreadWidth); // sides holding motor mount

	UprightLength = MountWidth + 2*StrutThick;

	StandBoltHead = IntegerMultiple(Head10_32,5); // bolt head rounded up
	StandBoltOC = IntegerMultiple(UprightLength + 2*StandBoltHead,5);

	StandLength = StandBoltOC + 2*StandBoltHead;
	StandWidth = 2*StandBoltHead;

	StandBoltClear = (StandLength – UprightLength)/2; // flat around bolt head

	Recess = StandWidth – MountThick;

	echo(str("Stand Base: ",StandLength," x ",StandWidth," x ",StandThick));
	echo(str("Stand Bolt OC: ",StandBoltOC));
	echo(str("Strut Thick: ",StrutThick));

	//———————-
	// Useful routines

	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=(FixDia + HoleWindage)/2,
	h=Height,
	$fn=Sides);
	}

	//———————-
	// Model

	module MotorMount() {

	difference() {
	translate([StandThick/2,0,StandWidth/2])
	cube([(MountWidth + StandThick),StandLength,StandWidth],center=true);

	translate([-Protrusion/2,0,StandWidth – (Recess – Protrusion)/2])
	cube([(MountWidth + Protrusion),MountWidth,(Recess + Protrusion)],center=true);
	translate([0,0,-Protrusion])
	PolyCyl(Connector[OD],StandWidth,4*4);
	for (j=[-1,1]) // cutouts over bolts
	translate([-Protrusion/2,
	j*((StandLength – StandBoltClear)/2 + Protrusion/2),
	StandWidth/2])
	cube([(MountWidth + Protrusion),
	(StandBoltClear + Protrusion),
	(StandWidth + 2*Protrusion)],center=true);
	for (j=[-1,1]) // stand bolt holes
	translate([(MountWidth/2 – Protrusion),j*StandBoltOC/2,StandWidth/2])
	rotate([0,90,0])
	rotate(180/6)
	PolyCyl(Clear10_32,StandThick + 2*Protrusion,6);

	translate([0,-(UprightLength/2 – ThreadWidth/2),StandWidth/2])
	rotate([90,180,0])
	linear_extrude(ThreadWidth,convexity=10)
	text(text=str(Connector[OD]),size=6,spacing=1.20,font="Arial",halign="center",valign="center");
	}
	}

	//———————-
	// Build it

	MotorMount();

view raw Connector Mount.scad hosted with ❤ by GitHub

The New Hotness

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