53 lines
1.4 KiB
OpenSCAD
53 lines
1.4 KiB
OpenSCAD
// epicyclic.scad
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// an epicyclic gearbox, similar to a Rohloff or Shimano Nexus 11
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// dimensions in millimetres, mostly from https://www.rohloff.de/en/service/handbook/speedhub/technical-data
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// (c) Simon Brooke 2025; CC-BY-SA
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include <SprocketGenerator2/files/Sprocket_Generator_v2_example_10.scad>
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module epicyclic (olnd=135, disc=1) {
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body_width=116;
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spoke_flange_width=3.2;
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// axle
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color("grey")
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cylinder(h=(olnd + 12), r=6, center=true);
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// locknuts, etc
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color("black")
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cylinder(h=olnd, r=15, center=true);
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// epicyclic body
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color("red")
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cylinder(h=body_width, r=46, center=true);
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// spoke flanges. TODO: yes, they need spoke holes.
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translate([0, 0, (body_width/2) - spoke_flange_width])
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color("red")
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cylinder(h=spoke_flange_width, r=54);
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translate([0, 0, 0 - (body_width/2)])
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color("red")
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cylinder(h=spoke_flange_width, r=54);
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// primary chain sprocket, obvs
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translate([0, 0, 3 - (olnd/2)])
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color("grey")
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sprocket(teeth=20, roller=7.9, pitch=12.7);
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translate([0, 0, 0 - ((body_width/2) - spoke_flange_width)])
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color("grey")
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sprocket(teeth=30, roller=7.9, pitch=12.7);
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// disc brake, if present. TODO: details of disc spider
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if (disc==1) {
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translate([0, 0, (olnd/2) - 7])
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color("silver")
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cylinder(h=1.5, r=75);
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}
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}
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// rotate([90, 0, 0])
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// epicyclic(); |