4th axis rotary problem - every line feedrate and terribly slow feedate

[Anonymous]

Hello,

I have a problem with 4th axis toolpath - Rotary on Haas NGC machine.

If I set "Rotary moves use IPM" at YES then feedrate is terribly slow (few times slower than normal).

If I set "Rotary moves use IPM" at NO then axis is jerking and it move smoothly.

Why almost on every single line there is a feedrate value? Diameter is the same over the length.

Thanks,

Maciek

[djordje.gavrilovicQL2DF]

I've tried testing it with changing setting 34 in the post and also in the control unit. I see the feedrate in the nc being higher, but the a axis in the machine just won't go smoothly.  I changed the feed rate from low to high until control unit displayed prompt lim feed. Only difference from before is that now lim feed appears right away on the screen with the same feed parameters as before, as opposed to before when I could manually override the feed rate up around 800% until it shows lim feed, but even when I increased the feed manually at that point nothing changed much.

I also did the additional change in order to use combination of DPM feedrates that you mentioned, but that didn't do much.

I'll continue trying different things that I can think of...

Anyway, I want to thank you for the effort @bob.schultz , I really appreciate it.

[ryansmith_]

Hey @djordje.gavrilovicQL2DF and @bob.schultz thanks for your posts on this. I also have a pre-NGC VFOE and am getting the stutter on every line with both Inverse Time and IPM/DPM. I took slow motion video and the A axis appears to be decelerating to stop and then reaccelerating for every line.

I was just curious if you found a solution to this? Thanks in advance.

[bob.schultz]

Hi @ryansmith_,

It sounds like the table may be unclamping and clamping at each move.  Do you see an M11 in your NC-code?  This will be at the start of the operation and should unclamp the A-axis and leave it unclamped until it sees an M10 code.  You should not see the clamp code (M10) until the end of the multi-axis operation.