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OpenSCAD source code: Miniblind bottom rail endcap and cord pull cap
// Cap for miniblind cord and bottom rail endcaps
// Ed Nisley KE4ZNU - September 2016
Layout = "BaseEndCap"; // CordCap BaseEndCap
//- Extrusion parameters - must match reality!
ThreadThick = 0.25;
ThreadWidth = 0.40;
Protrusion = 0.1;
HoleWindage = 0.2;
//------
// Dimensions
OD1 = 0;
OD2 = 1;
LENGTH = 2;
//----------------------
//- Build it
if (Layout == "CordCap") {
Cap = [9.0,16.0,25.0];
Cord = [2.5,7.0,Cap[LENGTH] - 5];
NumSides = 8;
difference() {
hull() { // overall shape
translate([0,0,Cap[LENGTH] - Cap[OD1]/2])
sphere(d=Cap[OD1],$fn=NumSides);
translate([0,0,0.5*Cap[OD2]/2])
sphere(d=Cap[OD2],$fn=2*NumSides); // round the bottom just a bit
}
translate([0,0,-Cap[LENGTH]/2]) // trim bottom
cube([2*Cap[OD2],2*Cap[OD2],Cap[LENGTH]],center=true);
translate([0,0,Cap[LENGTH] + 0.8*Cap[OD1]]) // trim top (arbitrarily)
cube([2*Cap[OD1],2*Cap[OD1],2*Cap[OD1]],center=true);
translate([0,0,-Protrusion])
cylinder(d=Cord[OD1],h=(Cap[LENGTH] + 2*Protrusion),$fn=NumSides);
translate([0,0,-Protrusion])
cylinder(d1=Cord[OD2],d2=Cord[OD1],h=(Cord[LENGTH] + Protrusion),$fn=NumSides);
}
}
if (Layout == "BaseEndCap") {
Base = [25.2,9.0,12.2]; // base outside dimensions
Edge = 8.0; // size of sqare ends
CornerRadius = 0.75;
Wall = 3; // wall thickness in threads
ChordHeight = (Base[1] - Edge) / 2;
ChordRadius = (pow(ChordHeight,2) + pow(Base[0],2)/4) / (2*ChordHeight);
NumSides = 4*4;
echo(str("Chord height: ",ChordHeight," radius: ",ChordRadius));
difference() {
linear_extrude(height=Base[2],convexity=2) {
hull() {
for (i=[-1,1], j=[-1,1])
translate([i*(Base[0]/2 - CornerRadius + Wall*ThreadWidth),j*(Base[1]/2 - CornerRadius + Wall*ThreadWidth)])
circle(r=CornerRadius,$fn=4*4,center=true);
for (j=[-1,1])
translate([0,j*(ChordHeight + Base[1]/2 - CornerRadius + Wall*ThreadWidth)])
rotate(180/(2*4))
circle(r=CornerRadius,$fn=2*4,center=true);
}
}
translate([0,0,3*ThreadThick])
linear_extrude(height=Base[2],convexity=2)
intersection() {
intersection_for (j=[-1,1])
translate([0,j*(ChordHeight + Base[1]/2 - ChordRadius)])
circle(r=ChordRadius,$fn=32*4,center=true);
square([Base[0],2*Base[1]],center=true);
}
}
}
@ednisley

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@ednisley ednisley commented Sep 7, 2016

More detail on my blog at http://wp.me/poZKh-6aL

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