We have a Streamline Automation CNC that was designed for cutting large EPS blocks of foam. We also use this machine to cut flat sheet stock like wood and plastic. Because this machine has such a large Z Axis the router is mounted very high off the surface. This results in shaking of the mount when a dramatic change in the tool path occurs. Its like driving a car into a sharp corner and not letting off the gas or braking, the machine just goes in full throttle, whatever the feed rate is set at.
The lead into a tight corner cuts pretty smooth but with the sudden change in direction to get out of the corner cut there is a shake that occurs and makes a scalloped cut coming out due to the shaking. This is sometimes accompanied with a bang or hit sound because the change in direction is so forceful on the machine.
Is there a way to slow the feed rate coming into a tight corner and then slowly ramp back up to speed once you come out of the cut? I'm familiar with the Motion Delays in FlashCut but that just seems to force the machine to a dead stop (resulting in shaking) then it immediately accelerates back to the feed rate resulting in shaking coming out of the corner.
We've tuned the servos and tightened everything up which resulted in much better machine operation but that does not address the high mount design that will shake. Lowering overall feed rate helps but then we have to deal with slow cut times and some materials require higher feed rates.