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// SJCAM C100+ Camera Mount for Tour Easy seat back rail |
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// Ed Nisley – KE4ZNU |
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// 2023-04 |
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/* [Layout Options] */ |
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LookAngle = -20; // camera angle, looking backwards = 0° |
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Layout = "Show"; // [Show,Build] |
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/* [Hidden] */ |
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ThreadWidth = 0.40; |
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ThreadThick = 0.25; |
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HoleWindage = 0.2; |
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Protrusion = 0.1; |
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ID = 0; |
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OD = 1; |
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LENGTH = 2; |
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//—– |
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// Dimensions |
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ClampScrew = [5.0,10.0,40.0]; // ID=thread OD=washer LENGTH=total |
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ClampInsert = [5.0,7.5,10.5]; // brass insert |
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MountScrew = [5.0,10.0,23.0]; // ID=thread OD=washer LENGTH=under nut |
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MountInsert = [5.0,7.5,10.5]; // ID=screw OD, OD=knurl dia |
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EmbossDepth = 2*ThreadThick + Protrusion; // recess depth + Protrusion beyond surface |
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DebossHeight = EmbossDepth; // text height + Protrusion into part |
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RailOD = 20.0; // slightly elliptical in bent section |
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RailSides = 2*3*4; |
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ClampOA = [60.0,40.0,ClampScrew[LENGTH]]; // set clamp size to avoid weird screw spacing |
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echo(ClampOA = ClampOA); |
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ClampScrewOC = IntegerMultiple(ClampOA.x – ClampScrew[OD] – 10*ThreadWidth,1.0); |
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echo(ClampScrewOC = ClampScrewOC); |
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ClampOffset = 5.0; // in case we need more room on top |
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ClampRadius = 3.0; |
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ClampSides = 8; |
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Kerf = 1.0; // slice through the middle |
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// center mount blade, Z = depth into block |
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MountBlade = [15.0 + 2*HoleWindage, |
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3.0 + 2*HoleWindage, |
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(ClampOA.z – RailOD + ClampOffset)/2 – 4*ThreadThick + Protrusion]; |
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echo(MountBlade = MountBlade); |
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MountRadius = MountBlade.x / 2; |
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MountGap = 9.5; // camera mount gap around center blade |
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MountOffset = [0,0,7.0]; // mount hole offset from block surface |
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FadeColor = "Green"; |
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FadeAlpha = 0.25; |
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//—– |
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// Useful routines |
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function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit); |
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module PolyCyl(Dia,Height,ForceSides=0) { // based on nophead's polyholes |
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Sides = (ForceSides != 0) ? ForceSides : (ceil(Dia) + 2); |
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FixDia = Dia / cos(180/Sides); |
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cylinder(r=(FixDia + HoleWindage)/2, |
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h=Height, |
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$fn=Sides); |
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} |
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//—– |
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// Clamp |
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// Grips seat frame rail |
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// Origin at middle of seat rail, X rearward, Y parallel to seat frame rail |
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// Block offset raises whole thing |
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module Clamp() { |
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difference() { |
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translate([0,0,ClampOffset]) { |
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difference() { |
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union() { |
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hull() // the main block |
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for (i=[-1,1], j=[-1,1], k=[-1,1]) |
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translate([i*(ClampOA.x – 2*ClampRadius)/2, |
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j*(ClampOA.y – 2*ClampRadius)/2, |
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k*(ClampOA.z – 2*ClampRadius)/2]) |
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sphere(r=ClampRadius/cos(180/ClampSides),$fn=ClampSides); |
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hull() // camera mount boss |
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for (k=[0,1]) |
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translate([0,0,k*(MountOffset.z) + ClampOA.z/2]) |
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rotate([0,90,LookAngle + 90]) rotate(180/12) |
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cylinder(r=MountRadius,h=MountScrew[LENGTH],center=true,$fn=12); |
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} |
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for (i=[-1,1]) // clamp inserts |
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translate([i*ClampScrewOC/2,0,-(ClampOA.z/2 + Protrusion)]) |
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rotate(180/6) |
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PolyCyl(ClampInsert[OD],ClampInsert[LENGTH],6); |
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for (i=[-1,1]) // clamp screw holes |
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translate([i*ClampScrewOC/2,0,-ClampOA.z]) |
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rotate(180/6) |
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PolyCyl(ClampScrew[ID],2*ClampOA.z,6); |
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translate([0,0,ClampOA.z/2 – (MountBlade.z/2 – Protrusion/2)]) // camera center blade |
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rotate(LookAngle) |
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cube(MountBlade,center=true); |
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rotate(LookAngle + 90) // camera mount boss slot |
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translate([0,0,ClampOA.z/2 + 2*MountRadius]) |
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cube([MountGap,4*MountRadius,4*MountRadius],center=true); |
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translate([0,0,ClampOA.z/2 + MountOffset.z]) // camera mount boss hole |
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rotate([90,0,LookAngle]) |
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cylinder(d=MountScrew[ID],h=4*MountGap,center=true,$fn=6); |
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translate([0.3*ClampOA.x, // recess for LookAngle legend |
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-(ClampOA.y/2 – (EmbossDepth – Protrusion)/2), |
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ClampOA.z/4]) |
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cube([15,EmbossDepth,8],center=true); |
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translate([0,0,-ClampOA.z/2 + (EmbossDepth – Protrusion)/2]) // recess for ID legend |
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cube([35,10,EmbossDepth],center=true); |
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} |
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translate([0.3*ClampOA.x, // LookAngle legend |
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-ClampOA.y/2 + DebossHeight + Protrusion/2, |
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ClampOA.z/4]) |
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rotate([90,0,00]) |
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linear_extrude(height=DebossHeight,convexity=20) |
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text(text=str(LookAngle),size=6,spacing=1.20, |
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font="Arial:style:Bold",halign="center",valign="center"); |
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translate([0,0,-ClampOA.z/2]) // ID legend |
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linear_extrude(height=DebossHeight,convexity=20) |
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mirror([0,1,0]) |
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text(text="KE4ZNU",size=5,spacing=1.20, |
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font="Arial:style:Bold",halign="center",valign="center"); |
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} |
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cube([2*ClampOA.x,2*ClampOA.y,Kerf],center=true); // split across rail |
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rotate([90,0,0]) // seat rail |
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cylinder(d=RailOD,h=2*ClampOA.y,$fn=RailSides,center=true); |
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} |
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} |
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//—– |
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// Build things |
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// Layouts for design & tweaking |
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if (Layout == "Show") { |
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Clamp(); |
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color(FadeColor,FadeAlpha) |
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rotate([90,0,0]) |
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cylinder(d=RailOD,h=2*ClampOA.y,$fn=RailSides,center=true); |
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} |
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// Build layout |
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if (Layout == "Build") { |
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translate([0,0.7*ClampOA.y,0]) |
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difference() { |
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translate([0,0,-Kerf/2]) |
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Clamp(); |
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translate([0,0,-ClampOA.z]) |
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cube(2*ClampOA,center=true); |
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} |
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translate([0,-0.7*ClampOA.y,-0]) |
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difference() { |
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translate([0,0,-Kerf/2]) |
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rotate([0,180,0]) |
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Clamp(); |
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translate([0,0,-ClampOA.z]) |
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cube(2*ClampOA,center=true); |
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} |
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} |
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