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64:1 Gearbox v.2.0

by MaskedRetriever Mar 22, 2009
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I'm using this as my first attempt at making a mess of stuff at once, also my first attempt using fine resolution.

printing at 150% right now I could not print at 100%

Too small of parts. The smallest gear was just a blob with teeth when I finished.

The gears are made well, but the top piece and the bottom piece are not going well. The pieces should be redesigned. I have doubts on the pins of the gears ... maybe need to replace them with a hole and use a metal pin. The idea is still beautiful, but unfortunately not functional. Another problem is related to the gear outside ... its diameter is large and would cause too much friction.

The concept is interesting but when printed the size of the moving parts is exactly the size of the wholes (so they don't fit). I tried importing the .stl into OpenSCAD to make the wholes bigger but unfortunately I hit an error in openSCAD (some exception when rendering).

I might need to create my own openscad files from scratch for the upper and lower plates.

Hi MaskedRetriever / All.

Have you printed this? The info suggests you / others have. I would love to see some pics of your gears, mine didn't come out too well.

If you could squeeze in a rotor encoder between the motor and gearbox, this would make the unit more usable as a substitute for a stepper motor. I picture a flat reprapped disk with cut out areas that would let light pass from an LED to a photocell.

If you could divide the rotation into 8 readable positions going in, that would give you a 512 position output, which would be slightly better than the 200-step steppers (400 half steps) that some repraps are using. Question is, would it match the stepper's speed?

Great design. I like the servo horns (too)!