Thanks, I have opted to try a direct drive version now, linear guides, rack and pinion with 15T pinion.

Part of the issue I have now is caused by the belts so I don't want to add that back into the mix.

I have also got some larger motors coming - 4Nm with DSP drivers and a higher voltage PSU, that all means i can build more of the new table before removing bits from the old one.

Ballscrews are out for the present.

If the direct drive fails then an easy upgrade to belt reduction boxes is made. Rack and pinion seems to be the industry standard, a few are direct drive, we will see what happens I think.

The gantry is looking like 50x75x3mm steel, with a strengthening strip inside where the rail and rack screws on.

Aluminium was looked at, and is lighter, but stiffness suffers as a result and I want it rigid this time ;)