On a manual mill you would lock down the table and put the dial indicator against the table in the direction of the test. then you would turn the hand wheel for that axis and the indicator would read the backlash....you would do the same for both axis'. With a CNC....I would do some pragmatic test...like mill a square of x dimensions and measure it....do the same thing with a circle....and a circle inscribed by a square....a 30 degree ramp and a 60 degree ramp..... |