Problem with jerky cutting

PPRINT

I have seen similar problems with a project that I have worked on with my DDCSV1.1.

I believe I have tracked the problem down to micro moves.  Meaning tons of little moves on the order of magnitude of .01mm.  I am guessing there is some sort of issue to do with the accel/decel settings.

I normally post my code with a very tight linearization tolerance to give me very accurate results.  Problem is that means tons of small moves.  I am normally cutting foam or wood so the tolerance was not necessary.  Once I relaxed my tolerances I now get code that will run smooth.

I know that is not an answer to your question, but maybe it will help in some way.

Rob
Edit:
I will run your code in my machine later today and see what I get on my system.

PPRINT

I just ran the code on my machine and did not see any reduction in speed.  

I will link a video below.  I ran the first 2:40 minutes at 300% override (est 7200mm/min) until the program made it to the last z height and started it's inward morphing.  At that point it was pounding my machine pretty bad so I slowed it back down to 100% override.  I didn't see any reduction of speed.

If I ran this sort of code all the time I would have to spend time tuning the parameters in the control and my drivers to get that pounding out.  Since I am not worried about speed on this hobby machine I will leave that for another day.

https://youtu.be/RGxIPwSjoWE

Turn the sound down unless you love the scream of a cheap air-cooled router motor.  It does start sounding like a scene from Jurassic Park once it gets to pounding in the bottom.  LOL