Just sitting you gantry on the rails is asking for trouble. As the router plunges the gantry will want to lift. If you used an over half cube then that would be OK.
You might want a few lengthways stiffeners in the bed to stop it drooping in the middle.
You could also do with some bracing of the Z axis. A back plate and then some gussets would be OK. Four slides on the Z would also be preferable.
Other than that get building.
Graham
p.s. You can mount your steppers outboard if it helps but make the ends of the leadscrews inboard. |