gjhammer,

Welcome to the forum! I would offer one piece of advice on your build so far, and that is to use multi-start ACME screws rather than the single start ones you have now. With a 60" screw, you're going to get whip like crazy at even moderate speeds. This can be mitigated somewhat by using a 5 start screw, since your screw only needs to turn 1/5 the speed for the same linear speed. Really , about 4 feet is the max for most 1/2" screws, which is why I came out with my R&P drive system, although I have seen people get a 60" axis to work with multi-start ACME.

Best regards,

Ahren
www.cncrouterparts.com