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OpenSCAD source code: CNC 3018-Pro Run-Hold switch mount block
// CNC 3018-Pro Run-Hold Switches
// Ed Nisley - KE4ZNU - 2020-01
Layout = "Build"; // [Show,Build,ProjectionX,ProjectionY,ProjectionZ,Block]
/* [Hidden] */
ThreadThick = 0.25;
ThreadWidth = 0.40;
HoleWindage = 0.2;
Protrusion = 0.1; // make holes end cleanly
function IntegerMultiple(Size,Unit) = Unit * ceil(Size / Unit);
ID = 0;
OD = 1;
LENGTH = 2;
inch = 25.4;
//----------------------
// Dimensions
RodScrewOffset = [22,0,-14.5]; // X=left edge, Y=dummy, Z=from top edge
BeamScrewOffset = [50,0,-10];
LeadScrewOffset = [RodScrewOffset.x,0,-45]; // may be off the bottom; include anyway
LeadScrew = [8.0,10.0,5.0]; // ID=actual, OD=clearance, LENGTH=stick-out
Screw = [5.0,10.0,6.0]; // M5 SHCS, OD=washer, LENGTH=washer+head
ScrewSides = 8; // hole shape
WallThick = 3.0; // minimum wall thickness
FlangeThick = 5.0; // flange thickness
Switch = [15.0 + 2*HoleWindage,15.0 + 2*HoleWindage,12.5]; // switch body
SwitchCap = [17.5,17.5,12.0]; // ... pushbutton
SwitchClear = SwitchCap + [2*2.0,2*2.0,Screw[OD]/(2*cos(180/ScrewSides))];
SwitchContacts = 5.0; // contacts below switch
SwitchBase = SwitchContacts + Switch.z; // bottom to base of switch
MountOffset = abs(RodScrewOffset.z) + SwitchClear.z; // top of switch mounting plate
FrameWidth = 60.0; // CNC 3018-Pro upright
FrameRadius = 10.0; // ... front corner rounding
CornerRadius = 5.0; // pretty part rounding
CornerSquare = 10; // dummy for square corner
MountOAL = [FrameWidth, // covers machine frame
2*FlangeThick + 2*Screw[LENGTH] + SwitchClear.y, // clear screw heads
MountOffset + Switch.z + SwitchContacts
];
echo(str("MountOAL: ",MountOAL));
SwitchOC = [MountOAL.x/2,FlangeThick + 2*Screw[LENGTH] + SwitchClear.y/2,0];
CableOD = 5.0;
NumSides = 2*3*4;
Gap = 2.0; // between build layout parts
//----------------------
// 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,
$fn=Sides);
}
// Projections for intersections
module ProjectionX() {
sr = CornerSquare/2;
rotate([0,90,0]) rotate([0,0,90])
linear_extrude(height=FrameWidth,convexity=3)
// mirror([1,0]) // mount on motor side of gantry
union() {
translate([0,-MountOAL.z])
square([FlangeThick,MountOAL.z]);
hull() {
translate([MountOAL.y - CornerRadius,-MountOffset + SwitchCap.z - CornerRadius])
circle(r=CornerRadius,$fn=NumSides);
translate([sr,-MountOffset + SwitchCap.z - sr])
square(CornerSquare,center=true);
translate([sr,-MountOAL.z + sr])
square(CornerSquare,center=true);
translate([MountOAL.y - sr,-MountOAL.z + sr])
square(CornerSquare,center=true);
}
}
}
module ProjectionY() {
sr = CornerSquare/2;
rotate([90,0,0])
translate([0,0,-FrameWidth])
difference() {
linear_extrude(height=2*FrameWidth,convexity=3)
hull() {
translate([FrameRadius,-FrameRadius])
circle(r=FrameRadius,$fn=NumSides);
translate([FrameWidth - sr,-sr])
square(CornerSquare,center=true);
translate([sr,-MountOAL.z + sr])
square(CornerSquare,center=true);
translate([MountOAL.x - sr,-MountOAL.z + sr])
square(CornerSquare,center=true);
}
translate([RodScrewOffset.x,RodScrewOffset.z,-Protrusion])
rotate(180/ScrewSides) PolyCyl(Screw[ID],2*(FrameWidth + Protrusion),ScrewSides);
for (j=[-FlangeThick,FrameWidth + FlangeThick])
translate([RodScrewOffset.x,RodScrewOffset.z,j])
rotate(180/ScrewSides) PolyCyl(Screw[OD],FrameWidth,ScrewSides);
translate([BeamScrewOffset.x,BeamScrewOffset.z,-Protrusion])
rotate(180/ScrewSides) PolyCyl(Screw[ID],2*(FrameWidth + Protrusion),ScrewSides);
for (j=[-FlangeThick,FrameWidth + FlangeThick])
translate([BeamScrewOffset.x,BeamScrewOffset.z,j])
rotate(180/ScrewSides) PolyCyl(Screw[OD],FrameWidth,ScrewSides);
translate([LeadScrewOffset.x,LeadScrewOffset.z,FrameWidth - LeadScrew[LENGTH]])
rotate(180/ScrewSides) PolyCyl(LeadScrew[OD],2*LeadScrew[LENGTH],ScrewSides);
}
}
module ProjectionZ() {
translate([0,0,-MountOAL.z])
// mirror([0,1]) // mount on motor side of gantry
difference() {
linear_extrude(height=MountOAL.z,convexity=3)
difference() {
square([MountOAL.x,MountOAL.y]);
translate([SwitchOC.x/2,SwitchOC.y])
square([Switch.x,Switch.y],center=true);
translate([3*SwitchOC.x/2,SwitchOC.y])
square([Switch.x,Switch.y],center=true);
}
for (i=[-1,1])
translate([i*SwitchOC.x/2 + MountOAL.x/2,SwitchOC.y,SwitchBase + MountOAL.z/2])
cube([SwitchClear.x,SwitchClear.y,MountOAL.z],center=true);
translate([-Protrusion,SwitchOC.y - 2*CableOD - Switch.y/2,-Protrusion])
cube([MountOAL.x + 2*Protrusion,CableOD,CableOD + Protrusion],center=false);
for (i=[-1,1])
translate([i*SwitchOC.x/2 + MountOAL.x/2,SwitchOC.y - SwitchCap.y/2,CableOD/2 - Protrusion])
cube([CableOD,SwitchClear.y/2,CableOD + Protrusion],center=true);
translate([SwitchOC.x/2,SwitchOC.y - CableOD/2,-Protrusion])
cube([SwitchOC.x,CableOD,CableOD + Protrusion],center=false);
}
}
module Block() {
intersection() {
ProjectionX();
ProjectionY();
ProjectionZ();
}
}
//- Build things
if (Layout == "ProjectionX")
ProjectionX();
if (Layout == "ProjectionY")
ProjectionY();
if (Layout == "ProjectionZ")
ProjectionZ();
if (Layout == "Block")
Block();
if (Layout == "Show") {
translate([-MountOAL.x/2,-MountOAL.y/2,MountOAL.z]) {
Block();
translate([MountOAL.x/2 + SwitchOC.x/2,SwitchOC.y,SwitchCap.z/2 - MountOAL.z + SwitchBase + 0*Switch.z])
color("Yellow",0.75)
cube(SwitchCap,center=true);
translate([MountOAL.x/2 - SwitchOC.x/2,SwitchOC.y,SwitchCap.z/2 - MountOAL.z + SwitchBase + 0*Switch.z])
color("Green",0.75)
cube(SwitchCap,center=true);
}
}
if (Layout == "Build")
translate([-MountOAL.x/2,-MountOAL.y/2,MountOAL.z])
Block();
@ednisley

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ednisley commented Jan 1, 2020

More details on my blog at https://wp.me/poZKh-8GH

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