Can anyone help me choose components for a belt-drive design for my 7x10 mini-lathe? I want to reduce by 1:2 for now, and have the option to reduce 1:3 or 1:4 if I need more torque. I'll live with the lower speed if necessary.
What size and types of belts/pulleys are good to use? I looked thru sdp-si.com, and somewhat randomly chose from the sizes available for the shaft size on my stepper. I came up with a MXL-pitch (.080) belt with .375" width, and pulleys with 15 and 30 grooves and 20 and 40 grooves for 1:2 reduction.
Is this wide enough? Strong enough? Should I use plastic or aluminium pulleys? What about the belt -- kevlar, fiberglass, polyester, or ... ???
The Z-axis shaft on the lathe is 9mm I believe -- should I just drill out a 5/16" pulley for this? Or can I find a matching-groove-size pulley with a metric hub somewhere?
Is there a good resource that would help me choose/design this properly? I've already done a decent mechanical design, but I just need to pick the right components.
Thanks,
-Neil.