A concept design for a cnc machine

[madprof1]

Hi all

If anyone could point out any flaws in this design please let me know.

The idea is to sync up 2 motors per axis except for Z. (EvoDrive ST-23 looks very interesting for the job). Reduce weight and stress on rails and leadscrews by offloading it length wise onto the side supports which might have its own rail system as well. The end holders for the rail and leadscrews use a solid slab of aluminium while retaining its accuracy under compression of the cross supports (they can never sag at all as the cross extrusion maintains vertical accuracy even if the bolts are not aligned correctly). These use 4 x m6 bolts. All structural key points are using 45 degree or L brackets for additional rigidity. The bed allows 600 x 450 and around 150mm Z height. I will redesign the Z axis to protect the rails and leadscrews from dust and wot not. The unit has enough room for surrounding clamps and a decent size bed for most people. Past the Y support I think the Z height could be increased to allow for a 4th axis at 200mm diameter (inner Z axis rail is 300mm with 80mm Spindle carriage support).

I think there are many options to include a gear reducer for 10mm leadscrew with some kind of pulley system. (2:1). A replacement of the gear to 1:1 for 10mm usage vs 5mm depending on material (as advised by jazzcnc)






Would like to hear your thoughts on this

Thanks

Madprof1