I have been messing with Mach3 for a while. I have been using it on a roter table with ballscrew X-axis and rack gaer Y-axis (Z ballscrew) I have never been able to get a good repeat on the machine it seems to allways be out a little, even when I try moving in one direction with .01 incramrnts, I have a dial indicator on it and each time I move 1 incrament it seems to lose or gain a little even in he same direction. The machine is ridiged and I have checkd the backlash. If I move using a manual wheel and a scale on the wheel it works fine. Can someone let me know something else to check, maybe a seting in the computer or frequency problem. Colud it be wires or even paralell port seting. Any help would be greatly apriciated. I am using zylotex controller and motors (269oz) the machine is a 3x3 table to router, my computer is a dell 1.5ghtz with WindowXP PRO and 1 gig of ram.

Thanks

Matt

What is your number of steps per unit?

Brian

Sorry it took so long. I've been out of town. X is 7900, Y is 1018.589 on a rack and pinion, and Z is 6400.

Thanks for the help.

Matt

in the y axis you have 1/1018.589 = .0009 units per step. but you are doing micro step so it is only going to be accutate to about .009*10 = .009 . You should see much better results on your X axis... How is the X axis? I think you need to add about a 4-5 to 1 reduction to get it as good as the other axis

Thanks
Brian