Hand-Crank 4:1 Gearbox with Dial
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A compound-gear reduction box. Four turns of the crank turn the output shaft once.
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- Printables
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- Other 3D Objects for Learning
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- Creative Commons — Attribution — Share Alike
A small hand-crank gearbox for learning how gear reduction works. A 12-tooth crank gear drives a 24-tooth gear on a compound shaft, and another 12-tooth-to-24-tooth pair drives the output shaft. The result is a 4:1 reduction you can watch: turn the crank four times and the pointer goes round once. The casing keeps the gears in place and shows off the mesh, while the lid provides an engraved dial with tick marks for both the crank and the output. It was engineered to not require supports while printing.
BOM:
1x Base
1x Lid
1x Arm Lever
1x Pointer
1x Gear 1
1x Gear 2
1x Gear 3
4x M3x6mm screws
Cyanoacrylate superglue or two-part epoxy.
Assembly:
Put the gears on their pins, with the crank gear and output gear meshed to the compound gear.
Place the lid and fasten the four screws.
Dry-fit the pointer and crank lever, set the crank at 12 o'clock with the pointer on "0", then glue them n
Turn and enjoy :)
Tips:
If the teeth bind, increase backlash to .3mm and re-print said gear. Test one gear pair first.
DON'T LET GLUE RUN INTO THE LID HOLE!
Also included a .step file, a .f3d for my fellow Fusion 360 users, and G-code for a Bambu Lab A1.