Weird jogging issue - banging noise

Hi, I have a really strange issue with random banging noise from a rack/pinion axis when using continuous jogging (on axis).  Jogging velocity is 500mm/min and I haven't tried higher numbers since I don't want to do any damage if it's some kind of servo reversal or something like that.  I've done G0/G1 moves at up to 3000mm/min with no noise at all.  I also tried Twincat and it jogs without any strange issues.  Any ideas what I might be looking for?

 

I am unsure what GUI you are using (perhaps it doesnt matter), but this sounds like an autorepeat issue.

To test if it is, open a terminal window, and enter the following command:

Launch LinuxCNC and jog around. If the problem goes away, that's the issue and we can come up with a more permanent solution.

To turn autorepeat back on:

I'm using xfce and I was actually jogging with the mouse and not the keyboard so I'm not sure the xset would make a difference unless the mouse in the axis interface is just emulating keypress.  Not sure if this could be related but I've noticed that on G0/G1 moves it will overshoot by a few hundredths of a mm and then come back to the requested position, ie G0 X100 goes to say 100.03 and then comes back to 100.  I'm not sure if the continuous jogging is done by sending small movement commands but if it went backward at the one of one then maybe it could cause that.  Testing it in the drive software and Twincat neither overrun and stop on the position exactly.

This morning I tried qtdragon_hd instead of axis and there is no issue with jogging via mouse so it must be specific to axis. The xset -r doesn't make any difference. I was just using axis for initial setup so using qtdragon_hd fixes it for me.

you might have an accel / decell problem.
there is special accel parameters for jogging..

setp joint.0.jog-accel-fraction .2

you can find it in the docs. look carefully.