Originally Posted by
sailnsea
Yes,in theory a cnc machine is accurate, in reality there are always small deviations.
For example:
Position the X axis in machine coordinates to position 10, 20, 30, 50, 60 mm and so on and measure with an accurate tool the movement of the axis and you will find maybe 9.99, 20.02, 30.05, 39.98, 50.01, 60.02 mm and so on.
So you will get an error list -0.01, 0.02, 0.05, -0.02, 0.02 mm at the testpoints.
Same for Y-axis and Z-axis.
If this error characteristic is repeatable it can be compensated by software and thus improve the machine's accuracy. Thanks for responses AHorn