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General Mach Discussion / Need Help - All Dimensions coming out small
« on: February 19, 2011, 09:22:31 AM »
I'm having a problem with my wood router running Mach3. When I make my cuts everything is coming out smaller than it should be. If I make a 2"X2" square it actually is coming out 1.994x1.994. I first thought that maybe my cutting tool size was off so I then tried a 2"x2" pocket. That came out 1.988 x 1.988. This is really confusing me. If my tool was too big then the OD on the profile would be undersize and the ID on the pocket would be oversize. They are both coming out undersize. The pockets appear to be 2x as far off as the profiles for finish dimension. Any ideas on what could be causing this? I am running probotix drivers and powermax II stepper motors and 1/2-10 acme 1 start screws. My motor tuning has steps set to 2000 per inch. The machine doesn't have any measurable backlash that I can find. I put a dial indicator on each axis and jogged it 1" forward and 1" back and it came right back to zero. There doesn't appear to be any tool offsets setup in Mach3. Any ideas what else to check?
Keith
Keith