Machine Slow on Curves

[JAZZCNC]

It will probably be down to CV mode. CV can be set to either Exact stop G61 or Constant Velocity G64. Check the G-code to see if it contains G61.

G61 will pause at the end point of each Arc or line segmant that make up the curve but follow closely the shape.

G64 keeps a constant feed by blending one segmant into the other, when the first segmant starts to decelerate at it's end point the next segmant starts to accelerate and the moves get blended together. This can give the affect of larger than required radius in square corners as the control try's to maintain commanded feed and acceleration while going around the bend but the control says hold on I can't go that fast around that bend but as to maintain the speed so it changes the radius to one it can go around at that speed.!! The affect of the radius is inversely proportional to acceleration. For this reason G64 as P & Q parameters to help with path deviation.

Mostly you'll cut in G64 mode as it gives smoother operation around corners. G61 is ok if your doing lots of point to point work but can be very jerky in corners, esp when the corner is made up of lots of line segments like lots of Cam software like to spit out. You can instantly tell when machines set in G61 because it shakes the machine in corners.

If your G-code doesn't contain G61 then type G64 into the MDI before running same code and see if it runs differant. If it does then chances are Linux default parameters are set to G64.? I don't use Linux cnc so can't help you here.

One thing I do know thou is a very experienced CNC user who migrated to linux cnc came back to Mach3 because among other things the CV in Linux cnc was rubbish.!! . . . . It could be the same issues your experiencing.?