CNC Router

I have just bought the parts for a CNC router, which I hope to use for PCB milling and maybe some other routing type stuff. It's a 3040 type and I have an air cooled 2.2kW spindle (which is admittedly a bit large) and a 400W smaller spindle on order. I'm going to have to make a spindle mount for the larger spindle as the one on the 3040 is a 52mm diameter and I need 80mm.

I have a TinyG controller so I should be able to use USB as a connection to a host PC (which I also have to cobble together), which will be better than a parallel port.

The TinyG controller PCB:

I'm currently mounting the bits and bobs onto a shelf above the cnc. There's quite a few boxes, PSUs, controllers etc.