Low budget plasma setup,going with 7i96
It might depend a bit on what timing pulleys you can get. I know the small pulleys (and gears no doubt) are hard to mount as if you have to bore them out to suit a shaft, there is no meat there. I bought some so I could get 5:1 or so out of my existing timing pulleys but they would not work for my motor shafts.
rodw wrote: I know the small pulleys (and gears no doubt) are hard to mount as if you have to bore them out to suit a shaft, there is no meat there.
You can glue them on. Loctite 648 works well. It should have 18N/mm shear strength. Bonded area on 6mm shaft (Nema 23 smallest size) and 12mm long is 220mm^2 = 4kN. 4kN @ 3mm = 12Nm.
If you have motors > 12Nm then you will have pulleys more than 12mm wide,and shafts > 6mm dia.
Basically no stepper motor will have a shaft small enough that it can break free a pulley bonded on with 648.
Alternatively, you can bore out the pulley to a taper and draw in a tapered sleeve: photos.app.goo.gl/WfJHqqecYbyZcBvd9
But that's a deal more work, and may not have any advantage.
tecno wrote: Low budget 6:1
Printed in PETG or ABS
Crazy or ??
I wouldn't. But then I can make metal gears easily (though I might be tempted to print the internal gear....)
I would prefer to use a timing belt drive, as they do not introduce backlash.
On my lathe I used motorcycle camchain. Inverted-tooth chain is backlash free and more plasma-spark resistant than polymer belts.
I am tempted to print the rack and pinion just for kicks