Machsupport Forum
Mach Discussion => General Mach Discussion => Topic started by: Conrad Caron on July 13, 2018, 09:28:07 AM
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Hi all i need help for my z axis .....when i do a project my z axis goes actually below my block and keeps going deeper and deeper.
Cheers
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Hi,
it sounds like the Z axis is 'losing steps'. I know it sounds weird, how could it lose a step and yet go still lower, that sounds
like gaining a step doesn't it? In fact either gaining or losing a step or steps have the same effect, depending on how your Z axis is arranged
it might mean it goes higher OR lower.
Try running the program but with the Z axis above the part, 'cutting air', without the spindle running. Does it behave? Now run it again with the
spindle running. Does it behave? Spindles often produce a lot of electrical noise and can affect things like losing steps.
Its also possible that you have the Z axis tuned to agressively and the stepper can't keep up. Try a low maximum velocity in the Z axis tuning page with
an even lower acceleration. If it helps then you know you'll have to work out the reliable limits of your Z axis.
Craig
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Good afternoon all, I am also experiencing this issue. I did watch the YouTube video on Finding Lost Steps which was very helpful. I disabled my x an y axis and ran the troublesome program twice with just the z axis in motion (cutting air) and had no missed steps. As soon as I try to cut material I start losing steps again. I am now going to re-run the test but with my spindle on to see if I have a noise issue. Anyone have other suggestions?
Thank you for assistance.
Russell
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Hi all, I had the same problem years back Z ramping up...cutting air. I found it happened during very warm days, this may sound weird but I fixed the ramping up by putting a fan directly blowing on my G540 "Go Figure".
Al
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The Z can be a problem because of the spindle weight and the fact that tools tend to pull down so the Z motor can’t lift the weight. A counterbalance gas spring may be needed.