I'm still continuing the design but I'm have a lot of trouble designing a head that will easy to build but is also strong and spaces the spindle nose down a bit for atc capability currently it seems like it might work but I'm not quite sure because the Chinese dimensions are not very specific.
Along with that I'm trying to determine what kind of motors to use. The spindle I am considering the use of an ac servo because they are cheap from china and a 5hp one could be had for about $600. Or I could go with a standard motor and vfd but I'm not sure about minimum and max Rpms that's another situation that I don't know what will work better. I would appreciate if somebody had a rough guide for that. I'll be putting a vfd on my other mill and that info would really help me out.
Axis drive motors I want to be 750watt ac servos but that might not be enough acceleration to get moving as fast as I want. So maybe 1kw would be better. If you guys have a good motor calculator that would be great. Also maybe considering brush D.C. Servos for their ease to get and drive compatibility. Not to mention I have 4 of them around 2hp and a set of dgs2 drives but In this being a fresh design I'll stick to ac servos for now. The plan is 1:1 coupling but I can use a 5mm or 10mm pitch screw.