martin54 wrote:Like Adrian has said your test doesn't prove that it's not a machine issue at all. Photo carving where you have a lot of rapid z moves will show up problems that other forms of machining may not.
Go back to the very start & look at everything again, check for backlash, any tightness, loose couplings etc etc.
What control software are you running? Have you tried reducing the z axis acceleration & velocity? If you are using micro stepping what have you got it set at?
garylmast wrote:I’ve been fighting the problem of losing ‘Z’ height ever since I bought my machine. Although I agree, when milling, if I hit a spot that causes a bind or hit something like the hold down, it will lose steps and cause it to go out of calibration, however that is rare. I tried everything including changing the UBS board and the stepper motor, but still had the problem. I then changed the stepper motor to an oversize, two-phase, high torque thinking my 6 HP spindle (that weights the size of my car engine) was just too heavy for the stepper motor to hold it up. I had to retrofit because it would not fit where the original went, but that solved the problem, for a while. Once the motor got some wear, the heavy spindle would lower more than the stepper motor would hold. The most recent fix was adding a heavy spring. I have since tried a job that required a lot of ‘Z’ movement, which failed the first few times, but worked perfect after adding the spring.
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