Hi,

I'm in the end of my BT30 spindle project. For this spindle I want to build a machine which will be able cutting metals (even carbon steels) but I want big machining area like 50x50x20cm. I have trouble on deciding how the frame will be. I'll probably use thick tubular steel and maybe fill the tubes with something (epoxy granite or concrete). I don't think filled tubes will make the machine more rigid but maybe helps on emitting the vibes? The biggest question is should the gantry be fixed in that size?

Other question is, I hate ball screws as they always get bent when I cut the ends in my lathe. Having said that I may use pinion-rack, at lease on the longest axis (Y).

You see I really don't know what to build. Please help to shape the machine in my mind.

Best