Low cost 0 backlash transmission - Ball bearing + trapezoidal screw

[M250cnc]

Belt would certainly be a lot easier, not to mention faster. The 'Rapman' machine at school was pretty poor to be honest, mainly due to not being put together very well though I think! It only used 5mm belts and the pulleys were laser cut from acrylic.

Your not agreeing with me are you.

I use these belts on my lathe the Z is about 300mm BC

I was cutting some tool steel and a bit too hard it pushed the bar in the lathe chuck but the pulleys are about £30/40 each, built it has awesome power. Backlash is 0.05mm

Phil