Y axis drift

[Salted_Pork]

May or may not be anything to do with centroid, but my cnc router is accumulating drift in the Y axis. I did an experiment and homed the machine, and measured the distance from the edge of the machine to the axis. after manually jogging the machine back and forth 20 times, it had already drifted 0.005". I slowed down the max feedrate and acceleration, but got the same result. Its not exactly tied to the number of direction changes, sometimes its more.

Belts and pulleys and gears seem to be tight.

Running Chinese Leadshine Easyservo motors (hybrid steppers) and drives.

Any ideas are much appreciated.

[richardb15]

Which model leadshine are you using? The larger ones have the digital.display which you can cycle to show the L values, these are the position errors or missed steps. I'd just check they are both zero as a first step. They will show low values when accel or decel usually but should zero out at each reversal or stop.

[Salted_Pork]

Which model leadshine are you using? The larger ones have the digital.display which you can cycle to show the L values, these are the position errors or missed steps. I'd just check they are both zero as a first step. They will show low values when accel or decel usually but should zero out at each reversal or stop.

yeah it is the Chinese equivalent of the ES-DH1208 (sheet attached).

Good suggestion, I never knew what those numbers meant!

The L values hover around 20-30 while the machine is moving, and go back to zero when its stopped.

ES-DH1208d_V1.4.pdf

(393.81 KiB) Downloaded 4 times

[Salted_Pork]

Fresh Report attached

report_54453804251C-0118247882_2025-05-07_17-15-30.zip

(1.02 MiB) Downloaded 1 time

[richardb15]

If you look at page 10-11 of this install manual it shows the button workflow for the HMI on the drive and what each item means. You can see the H and L values point, but if yours settles to a zero value then it would seem okay, that isn't the drift reason. You can access the info by just using the up and down arrow keys once the derive has initialised.

[cnckeith]

drift is usually something loose or a sticky spot mechanically. check there first.