all in one dc loss of y home position

[phxvhouse]

ruined two parts today.
I did NOT notice faults, nothing out of the ordinary.

in short it seems that my work offset shifted from one position to another.
In the past I have noticed that my control would throw a encoder error, but typically a restart seemed to address the issue
now I am wondering if a larger issue has presented itself

attached zip report

anyone want to take a crack?

report_0008DC111213-0405100010_2025-06-12_19-01-01.zip

(2.89 MiB) Downloaded 7 times

better yet can anyone deceiper these reports.. I am afraid attempt anything else until i figure out whats going on

[cncsnw]

There are many possible causes for loss of position. Mechanical slippage somewhere is most likely.

A good starting point for troubleshooting would be to restart the control; home the machine; and mark the motor shaft orientation, ballscrew orientation, and axis position with each axis sitting at home.

Then, if you suspect it has lost position in some way, you can send it back to home using one or more of the following commands at the F3/MDI prompt:

Code: Select all

M91/X
M91/Y
M92/Z

If your marks do not line up where they were before, then something has slipped.
If the marks all line up, but the DRO in Machine Coordinates does not show 0.0000, then you have encoder problems.

See http://www.cncsnw.com/PosLoss.htm for some examples.

[CentroidFrog]

I see you're getting non stop MPG1 encoder errors.
Do you have an MPG?
If not you'll want to set P348 to 0 and that should get rid of that error.

[phxvhouse]

this popped up at restart..

and of course we have a job that needs finishing.. TODAY

[tblough]

That means something has moved on the Y axis. You can hit Y to accept. You will need to re-indicate your part as the machine home position will now be different than it was the previous time the machine was homed.

This adds credence to CNCSNW's idea that something is loose in your drivetrain. It could be as simple as the encoder is loose on the motor shaft, but something is moving.