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Added pulleys on Y sliders

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TQ Hirsch
2022-03-03 09:53:56 +01:00
parent 11116136f2
commit a7119fd012
3 changed files with 107 additions and 16 deletions
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37
stock_parts.scad
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@@ -60,10 +60,15 @@ module nema17(depth = 23.5) {
// belts and pulleys
belt_pitch = 2; // 2mm tooth width for GT2 = 2mm pitch
belt_width = 6;
belt_thickness = 3;
tooth_height = 2;
belt_thickness = 1.38;
belt_pld = 0.254; // distance between line of fixed length and tips of gear teeth
belt_backing = 0.63 - belt_pld;
tooth_height = 0.75;
module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
pulley_od = 13;
pulley_clearance_rad = pulley_od / 2 + 2.5;
module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true, od = 0) {
bom_item(printable=false, label=str(
toothed ? "pulley(" : "idler(",
"teeth=", teeth, ", ",
@@ -73,10 +78,12 @@ module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
"shaft=", shaft, "mm",
")"
));
inner_rad = belt_pitch * teeth / TAU;
outer_rad = inner_rad + belt_thickness;
nominal_rad = belt_pitch * teeth / TAU;
inner_rad = nominal_rad - belt_pld;
outer_rad = (od > 0) ? od / 2 : nominal_rad + belt_backing;
minor_rad = inner_rad - tooth_height;
mid_rad = inner_rad - tooth_height / 2;
idler_rad = nominal_rad - belt_backing;
dtheta = 180 / teeth;
@@ -105,7 +112,7 @@ module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
linear_extrude(belt_width)
polygon(tooth_points, convexity = teeth * 2 + 4);
} else {
cylinder(r = minor_rad, h = belt_width);
cylinder(r = idler_rad, h = belt_width);
}
translate([0,0,lrim + belt_width])
@@ -117,4 +124,22 @@ module pulley(teeth, lrim, urim, belt_width, shaft=5, toothed=true) {
}
}
idler_zmargin = [ 6.4 / 2 + 1.05, 6.4 / 2 + 1.05 ];
module idler(height=0, toothed=false) {
// pulley(20, 1.05, 1.05, 6.4, toothed=toothed, od=18);
translate([0,0, height-idler_zmargin[0]])
pulley(16, 1.05, 1.05, 6.4, shaft=3, toothed=toothed, od=13);
}
active_pulley_zmargin = [ 9.5, 4.5 ];
module active_pulley(height=0) {
translate([0,0,-active_pulley_zmargin[0] + height])
pulley(16,6,1,7, od=13);
}
// required distance between centers of pulley and idler for an S-bend with right angles.
pulley_sbend_offset = (9.5 + 9.7) / 2 + 0.63;
//!pulley(12, 6, 2, toothed=false);