Problem: With 4-axis milling, A-axis does not rotate smoothly, but jerks (twitches).
Watch the video: https://youtu.be/_HriYmDhB5I

With manual rotation, the 4th axis rotates smoothly.
Tell me how to fix this problem?

Thanks in advance!

System:
PowerMill  2019
Mach3

What does the code look like?

What does the code look like?

Gerry, please look g-kode:
https://drive.google.com/open?id=1mHVnXjiDJj1ILcx7CV1IuAyQ6UydWEbi

Hi,
860,000 lines of code?

What happens if you just take the first 5000 lines and try running those?

Another thing you might try is tuning off the toolpath display. My guess is that the file is so big that the toolpath display
is sucking up all the CPU power.

Craig

1,865,481 lines 
n line number start over
interesting file to read
yep joeaverage is right, computer cant do it all.
could try more memory and dedicated graphics card.
look like breaking it up in to smaller files would be the way to go, just takes some manual coding to end a section then create a new start for the next section.

Turning off the toolpath display will likely fix the issue.

Hi,
Mach4 is more tolerant of very large files. It can take a while for it to draw the initial toolpath with large files
but thereafter various zooms and view rotations seem near instantaneous.

Craig