Few pics of my homemade CNC mill

[wiatroda]

I use T2.5x6mm Synchroflex timing belts to transfer power from stepper to lead screw.X and Y axes have two motors to rotate the screws. And yesterday the belt snapped, not for the first time I gotta say. So now I'm planning to replace two 2.5mm pitch belts with one 5mm pitch on Y axis but still leaving two motors to steer two lead screws. Of course I'll need to replace timing pulleys and make some tensioners. Stuff ordered,hope it will work.

[Jonathan]

Looking good

I use T2.5x6mm Synchroflex timing belts to transfer power from stepper to lead screw...

I've used XL pitch belts, at least 1/2" wide and have never had any problems. Can also make your own pulleys for them with a bit of care which saves a bit.

What have you used for the nuts on, I think, the X axis? Is it just a brass/bronze bar tapped with the hole for oil or something more elaborate?

[wiatroda]

I don't have rotary table to cut the pulleys :( . Money are sometimes an issue so I went for smaller pitch, cheaper belts and pulleys. On all axis I've got M16x2 lead screws. Nuts I've made myself from 32mm dia steel bar. They are 60mm long with a grease nipple re-drilled to fit 4mm nylon tube for oiling. Very simple, good and cheap solution, with no backlash at all.