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/* Linear units are mm */
ext_dia = 32.0;
int_dia = 6.2;
h = 10;
mnth_dia = 3.2;
mnth_ins_dia = 6.0;
mnth_ins_h = 2.0;
mnth_center_r = 12.0;
mnth_num = 4;
bearing_od = 19.0;
bearing_h = 6.0;
$fn = 64;
translate([0, 0, h])
rotate(180, [0, 1, 0])
difference() {
cylinder(d=ext_dia, h=h);
cylinder(d=int_dia, h=h);
for (alpha = [0 : 360/mnth_num : 359.9999]) {
rotate(alpha, [0, 0, 1])
translate([-mnth_center_r, 0, 0])
union() {
cylinder(d=mnth_dia, h=h);
translate([0, 0, h-mnth_ins_h]) cylinder(d=mnth_ins_dia, h=mnth_ins_h);
}
}
cylinder(d=bearing_od, h=bearing_h);
}
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