I'm using a Keling Power Supply KL- 7220, Unregulated Power Supply 1440W, 72VDC/20A, I'm using it with 120VAC. It's on this page
http://www.kelinginc.net/SwitchingPowerSupply.html. I'm using a CNC4PC BOB C10
http://www.cnc4pc.com/Store/osc/product_info.php?cPath=33&products_id=45. I'm using all shielded wire. I don't have the shield part terminated anywhere, but I don't get any noise problem otherwise. The Problem is not flaky it's pretty much static, if I run it too fast X and Y at the same time where the one of the axis is shallow and no load I get the problem at about 65 IPM, if I'm hogging out material then 30 IPM. Seems pretty consistent to me.
Himy I don't have a scope, but I might be able to borrow one, if I use a multimeter what would I be looking for and what would I run on my machine to test it?