Index Homing odd offset

uggh, the plot when stopped indicates the drive doesnt move for about 100 ms of motion command from linuxcnc
is there a deadband in the drive? If so it needs to be turned off

For some reason I can't get motion when jogging with the arrows as I'm trying to hit the Force button on hal scope
This worked yesterday. What changed???

This is all I was able to capture today.



This is with P10, 50ipm- if i remember correctly

Sorry Andy, I was trying to add the f-error trace and capture more data. The Screenshot is all I was able to get since hitting the force button stopped motion.
Thanks for the hint on automatic trigger.

I tried your suggestion of P=.050, P=.5 then moved my way up to P=10 and got frustrated with the force button and don't have any captured data.

I was able to find a range where the ballscrew didn't seem to dither and that was below P=10. PCW suggested to increase P and then back off at the point of oscillation.
T
To see how accurate tracking is, I will try again with PID all at 0.

In Halscope, change your trigger from position-cmd to velocity-cmd (channel 4 to channel 1). It is the button on the bottom right corner of the screen. Then it should trace automatically instead of you having to manually pressing the force button.

Hello Guys, have this topic a solution? I have the same problem according I can read here.
Thank you!

I did not solve the problem. I ended up using my drives in step/dir mode without reading in the encoder and using homing switches instead of switch and index as I was unsuccessful in tuning it. Machine has been working great.
Are you just having issues with index homing? Are you running an analog servo system or are you trying to drive it with step/dir?

Hello OT-CNC, I have solved the problem thanks to PCW who told me to solve the following error playing with P.I.D. parameters and that made the trick, I don't know if this problem was the same.
Yes this machine is running servo with step/dir signals, the problem was the odd homing and also was imposible to set the DRO to zero when touching off any of the axes.
Thank you!