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OpenSCAD source code: TCRT5000 optical proximity sensor endstop mount for MPCNC Z Axis
// TCRT5000 Z Axis Endstop Mount
// Ed Nisley KE4ZNU - 2017-12-04
/* [Build Options] */
Layout = "Show"; // [Build, Show, Block]
Section = true; // show internal details
/* [Extrusion] */
ThreadThick = 0.25; // [0.20, 0.25]
ThreadWidth = 0.40; // [0.40]
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
/* [Hidden] */
Protrusion = 0.01; // [0.01, 0.1]
HoleWindage = 0.2;
ID = 0;
OD = 1;
LENGTH = 2;
/* [Sizes] */
RailOD = 23.5; // actual rail OD
OptoPCB = [32.5,14.2,1.6]; // prox sensor PCB
ComponentHeight = 5.0; // max component height above PCB
OptoSensor = [5.8,10.2,10.5]; // sensor head below PCB
OptoOffset = 3.0; // sensor head center from PCB edge
OptoRange = 2.0; // sensor to rail distance
TapeThick = 1.0; // foam mounting tape
WallThick = 4.0; // basic wall thickness
Block = [WallThick + OptoRange + RailOD/2 + (OptoPCB[0] - OptoOffset),
RailOD/2 + OptoRange + OptoSensor[2] - TapeThick,
IntegerMultiple(OptoPCB[1] + 2*WallThick,2.0)]; // basic block shape
echo(str("Block: ",Block));
NumSides = 6*4;
//- Adjust hole diameter to make the size come out right
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);
}
//- Shapes
// Main block constructed with PCB along X, opto sensor at Y=0
module PCBBlock() {
difference() {
translate([-(WallThick + OptoRange + RailOD/2),
(-Block[1] + RailOD/2 + OptoRange),
-Block[2]/2])
cube(Block,center=false);
for (i=[-(RailOD/2 + OptoRange + WallThick),
(OptoPCB[0] - OptoOffset)])
translate([i,0,0])
rotate([90,0,0]) rotate(45)
cube([2*ThreadWidth,2*ThreadWidth,2*Block[2]],center=true);
translate([0,(RailOD/2 + OptoRange),0])
cylinder(d=(RailOD + 2*OptoRange),
h=(Block[2] + 2*Protrusion),
$fn=NumSides,center=true);
rotate([90,0,0])
cube(OptoSensor + [0,0,Block[1]],center=true);
}
}
//- Build things
if (Layout == "Block")
PCBBlock();
if (Layout == "Show") {
translate([0,-(RailOD/2 + OptoRange),0])
PCBBlock();
color("Yellow",0.5)
cylinder(d=RailOD,h=2*Block[2],$fn=NumSides,center=true);
}
if (Layout == "Build")
translate([0,0,OptoSensor[2] - TapeThick])
rotate([90,0,0])
PCBBlock();
@ednisley

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ednisley commented Dec 5, 2017

More details on my blog at https://wp.me/poZKh-7cC

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