What CNC Machine is this?

[Doddy]

Please help, whats wrong this is in air without spindle connected and run in 5m/min could not be this bad trying to create circle. This is like worst shit i have seen really only hope its only something wrong in the setup not smooth at all and slow as shit. Please check the video recorded when its goes around. From 1min/m its the same slow and up and slower feedrate its slower but not smoother.
This cant be as bad as this. Nema 34 motors.

https://youtu.be/VTGPy6uqdxc

My gut feeling is that this is the post-processor / motion-controller's behaviour. I'll see your YouTube and raise you a YouTube,,,

https://www.youtube.com/watch?v=XT2Jq76NChM

Try setting CV mode in Mach3 and see if that improves things. If your design/post-processor is creating a large number of arcs then you're going to force the machine to accelerate, traverse and decelerate through each arc in exact-stop mode.

I'll be the first to lambast MD, but this isn't the machine.

**EDIT**

To improve the performance you'll need to examine/tinker with the axis acceleration settings. If you hit a limit here then you might need to examine the power-supply voltage to the steppers. This will have been (negatively) impacted by the choice of Nema34s if not adequately provisioned in the PSU. Other, more clever and experienced, folk here can advise.