Mach3 Backlash Issue

[strohkirchw]

I have had my mill setup for about a week now with the same settings and haven't changed anything. All of sudden today when I go to run test run a file I'm getting some weird stalls.

For some reason, when backlash comp is enabled in mach3 one of my motors will randomly stall if more than 1 is moving at the same time. For example, if I'm moving along the Y axis and I then go to move say the X axis at the same time it will randomly stale the Y axis but the X will keep moving. It makes the same noise as if you hit a limit on the table. I could be moving the X axis back and forth and then try to move the Z and it will randomly stall the X. I could let up and it won't do it 3 or 4 times then it does it. It stops if I turn off backlash comp which is weird as I've been cutting and playing with the mill for the last week and it has never done this.

[strohkirchw]

Fixed the problem it seems

The shuttle control was set to .004 but this appears to be to fast. Setting it to a slower .01 got rid of the stalls. How it worked for a week and then stop makes no sense to me.

[rowbare]

Did you forget to oil the machine in the meantime? Perhaps you were freshly oiled previously and the lubricant had run off. Sometimes a small thing like that can make all the difference. On mine it always seems that the first jog of the Z after not using the machine will lose steps or stall and it will be fine after that.

bob

[strohkirchw]

It was the first thing I tried actually. I had oiled it when I first got it and it definitely could have used some more.

[TaK]

strohkirchw,

Same thing happened to me. I used to be able to jog 2 axis at the same time. One day, it stopped working. I could jog one axis and when I pushed a button for another, the first would stop violently.

The only thing I changed in between was slowing down the acceleration of one of the axis. I guess there is some interaction there that I don't understand.

For now I have been ignoring it, but it's good there's a fix. I'll have to give it a try tonight.

[strohkirchw]

Just for reference, I ended up with .03 on the shuttle and 30IPM rapids and it has completely gone away. I guess I could mess around with the shuttle and rapid values but I'm happy for now.