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Author Topic: Z zero randomly changes on its own  (Read 464 times)

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Z zero randomly changes on its own
« on: February 27, 2020, 07:00:13 AM »
I have been using mach 4 for 2 months now. It has worked fine until this week. Now my z zero will change when I hit cycle start.
I always home my machine as soon as I turn it on. Then I load a program, then use my auto touch plate and set zero. It sets it at 1.9994. Now it has randomly been setting it as -5. Something. So I thought it had a problem. I started setting zero manually but now when I hit cycle start, it will sometimes change the z zero to the -5 and give me a soft limit error.
The only changes that I have made to mach 4 are adjusting the steps per unit, velocity and acceleration.
I have checked my travel in all directions and it travels the correct distance in every direction.
Watch the video and let me know what you think the fix is.
New fangled suggested that I come here for answers.
Re: Z zero randomly changes on its own
« Reply #1 on: February 27, 2020, 07:05:24 AM »
I guess I can't load an MP4 file on here. all the video shows is me hitting cycle start and the z zero setting of 1.9994 changing to a -5.something and the soft limit error code popping up like in the pic.

Offline Bill_O

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Re: Z zero randomly changes on its own
« Reply #2 on: February 28, 2020, 03:20:10 PM »
Do you have tool height information in your gcode file?
In other words is there a line that has H plus a tool number?
h6
Re: Z zero randomly changes on its own
« Reply #3 on: February 28, 2020, 06:59:36 PM »
Hi,
you don't have any extraneous setting in the Offsets Tab do you?

How about taking a screenshot of the machine diagnostics block when this happens.

Craig
My wife left with my best friend...
     and I miss him!

Offline smurph

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Re: Z zero randomly changes on its own
« Reply #4 on: March 10, 2020, 02:35:35 PM »
"Z axis commanded over SoftMax": What the error is telling you is that if you applied that offset in the DRO, it will cause a move that will violate the soft limits.  So I think this is purely a soft limit setup issue.  So...

The only changes that I have made to mach 4 are adjusting the steps per unit, velocity and acceleration.

If you have changed your counts per unit, you will probably have to change your soft limit setup.

Steve