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General Mach Discussion / Can anyone help with jog increment and circles?

« on: August 05, 2010, 08:28:19 AM »

Hi bit new to this CNC stuff and recently purchased a machine just setting it up, only problem I am having at the moment is I can't appear to jog in increments of .001, .01 etc ie decimal devisions of 1, it jogs .00035.  Now I know this is the min step distance of the machine but I thought Mach could compensate for this.  I.e 266,85 steps per mm,  Is there a setting I have missed?    Also when I cut a circle and square to test setup the square is more or less accurate to within .05 but the circle fluctuates to maybe 0.2, I have used various means to evaluate backlash and this appears to make little difference, Is there another setting I have missed here?

Thanks Nick