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// Mendel ball chain pulley for the Y axis. Designed for 3.2-3.5mm chain. Takes a piece of 3/16" brass tube in the centre as a bushing.
//
// GPL V3 Licenced, by Vik Olliver 2010-03-16
pulley_min_rad=5;
pulley_max_rad=8;
pulley_height=7;
pulley_bushing_rad=2.9;
translate ([0,0,pulley_height/2]) difference () {
union () {
translate ([0,0,pulley_height/4])
cylinder(pulley_height/2,r1=pulley_min_rad,r2=pulley_max_rad,center=true);
translate ([0,0,-pulley_height/4])
cylinder(pulley_height/2,r2=pulley_min_rad,r1=pulley_max_rad,center=true);
}
cylinder(h=pulley_height*2,r=pulley_bushing_rad, center=true);
}
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