I don't have any problems with the r&p system versus ACME screws. They both have their place and the uses overlap for some size machines. From what I've seen accuracy is not really the issue. My 48" long 1/2-10 5 start ACME screws are happy jogging at 700 ipm and my 144" long r&p system jogs at 1,400 ipm. I don't actually use either of them at over 250 to 300 ipm. Mostly between 150 and 200 ipm.
My r&p system has cut combination composite fiberglass/rhoacell foam/epoxy/solid carbon fiber plate parts that have been within a couple thousandths inch accuracy. I'll be checking the accuracy of the machine again next week for cutting a new set of parts from the same type of material. Paying work when I can get it.
All of the calendars, signs, and Stargate stuff I've cut is just for entertainment and software use education. I really need to move on to Aspire and the more roundy looking stuff. Somehow, Marilyn Monroe just doesn't look quite right as a V carving.
CarveOne
CarveOne
http://www.carveonecncwoodcraft.com