[GPtech]

Hi,
My mori is jumping on the X axis whenever there a value other than 0 in the parameter 535, backlash compensation.
Here's a video of what's happening.
https://youtu.be/7AdIM1ALRJ8

[underthetire]

no o manuals here, not sure if the zero has it or not, but on the newer controls id check what the rapid backlash parameter is set to (1851 on newer controls).

[GPtech]

no o manuals here, not sure if the zero has it or not, but on the newer controls id check what the rapid backlash parameter is set to (1851 on newer controls).

Well it jumps whether I use the handle or MDI the .001mm increment and at 100mm/m or 1000mm/m feed rates.

Is this the parameter your thinking of?
Cutting feed and rapid traverse separate backlash is disabled/enabled.
0076#4

My 76 parameter is set to 0.

[GPtech]

And it doesn't jump on the Y axis.

[underthetire]

Id check the Gibs on the X axis. You may be seeing pitch on the table, and why it shows so much backlash to begin with.

[GPtech]

Id check the Gibs on the X axis. You may be seeing pitch on the table, and why it shows so much backlash to begin with.

Ok, thanks. I'll give that a go, is the adjustment straight forward?

[GPtech]

Ok, Just wanted to give an update to this.

I received a phone call from a chap in Melbourne, Australia. That had a similar problem to me on a Chavalier VMC with a Fanuc 0mc controller.
He had Fanuc techs working all day on his machine trying to find the problem, the techs told him about parameter 8103.5, 8203.5, 8303.5 that was for backlash acceleration and could cause jumping as it was not implemented properly by the machine builder.
Unfortunately for him it didn't solve his problem, but after seeing my youtube video he made the effort to contact me to tell me about the parameters.
I tried it and it looks like it has fixed my problem.
I made a quick youtube video showing the difference.
https://youtu.be/Ch7JI9dDXzo