"Is Acme threading the same as Hi-Lead? I was looking at Roton and looking at 1/2"-10 lead screws. All multi-start screws are listed as Hi-Lead. The reason I want to know is to determine if I can buy the anti-backlash nuts from dumpstercnc.com which state they are for acme thread"
The Dumpster nuts will fit the Roton 1/2" 2 start 10 TIP screws and the Mc-Master screws but all 4 of my nuts from Dumpster had backlash I had to replace them with the nuts that Roton sells.
The Roton screws work fine and the standard metal is fine.
If you want over 75 IPM you might go with a faster screw and then you will have to get your nuts from Dumpster if you are direct driving your screws with a stepper.
The 1/2" 10 TPI 2 start (5 TPI) is a good starting point for many router tables but if you only plan on wood you might get a faster screw.