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// This KeyBak lifter works with
// It is designed to rest on the top of a Kossel-style Delta printer.
// It assumes that the top of the printer is made from 20x20mm aluminum
// extrusion.
// An M5x8 button socket head screw holds each side of the holder in place,
// and an M3x10 to M3x20 SHCS attaches the crossbar to it.
//
// This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
// International License.
// Visit: http://creativecommons.org/licenses/by-sa/4.0/
//
// Haydn Huntley
// haydn.huntley@gmail.com
$fn = 360/4;
include <configuration.scad>;
// All measurements in mm.
debug = false;
xSize = extrusionWidth;
ySize = extrusionWidth * 1.5;
topDiameter = 13;
height = 46;
baseHeight = 3.0;
keyWidth = 6.5;
keyDepth = 2.4;
keyLength = 0.25 * ySize;
module keyBakLifter()
{
difference()
{
union()
{
hull()
{
// The circular top.
translate([0, 0, height-smidge])
cylinder(d=topDiameter, h=smidge);
// The rectangular base.
translate([-xSize/2, -ySize/2, 0])
cube([xSize, ySize, smidge]);
}
// Add two trapezoids as keys on the bottom.
color("blue")
for (y = [1, -1])
translate([0, y*ySize*0.30, 0])
{
size = keyWidth * cos(45);
intersection()
{
rotate([0, 45, 0])
cube([size, keyLength, size], true);
cube([keyWidth, keyLength, keyDepth], true);
}
}
}
// Tapering hole for an M3x10 to M3x20 screw to attach the crossbar
// supporting the KeyBak.
translate([0, 0, height-20-smidge/2])
cylinder(r1=m3Radius-4*smidge, r2=m3TightRadius+2*smidge, h=20+smidge);
// Hole for M5x8 button head screw to attach it to the top of the
// frame.
translate([0, 0, -smidge/2])
cylinder(r=m5LooseRadius, h=baseHeight+smidge);
// Angled hole for accessing and inserting the M5x8.
hull()
{
translate([16, 0, 46])
scale([1.2, 1, 1])
cylinder(r=m5ButtonHeadRadius, h=smidge);
translate([0, 0, baseHeight+m5HeadHeight])
scale([1.2, 1, 1])
cylinder(r=m5ButtonHeadRadius, h=smidge);
}
translate([0, 0, baseHeight])
scale([1.2, 1, 1])
cylinder(r=m5ButtonHeadRadius, h=m5HeadHeight+smidge);
}
}
if (debug)
{
keyBakLifter();
}
else
{
// Rotate for printing, and do two of them.
translate([-height/2, -(ySize/2-3), xSize/2])
rotate([0, 90+atan((xSize-topDiameter)/(2*height)), 0])
keyBakLifter();
translate([height/2, ySize/2-3, xSize/2])
rotate([0, 90+atan((xSize-topDiameter)/(2*height)), 180])
keyBakLifter();
}
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