From the Loftsmith community

72T 24DP gear, 1" keyed bore

A big spur gear for when you need to step a motor's speed down or share a shaft's turning with something else. It has a round hub with a keyway to lock onto a 1" shaft, and six round cutouts in the web. Tweak the bore and keyway clearance to get the fit you like.

1 part · 17 g · 78 × 78 × 10 mm

Round orange spur gear with six round holes around a central hub with a keyway
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No adjustable sizes

Ask for the sizes you want to tweak, e.g. “make the width adjustable”.

Change it in the Studio

Parts

  • gear · PLA · Flat on either face

    No supports needed

Print settings

Layer height
0.16 mm (finer teeth)
Walls
4
Infill
25%
Supports
none
Notes
4 walls make the teeth and keyway walls basically solid.

Hardware

  • 1/8" square key · At least 3/8" long

Assembly

  1. Slide the gear onto the 1" shaft with the keyway lined up with the key seat.
  2. Tap in the 1/8" key. Hold the gear in place along the shaft with a set collar or a shoulder.

Good to know

  • The design check flags thin ledges on the teeth. Those are just the flat tops of the teeth, which a 24-pitch gear needs, so they're not a problem.
  • PLA teeth are good for light loads, up to about 1.5 N·m at 3/8" thick. Sliders on the Adjust tab change the fit: if the shaft or key is too tight or too loose, change Bore clearance or Keyway clearance. If the gear binds against its mate, raise Backlash.
I printed this Remix

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