Easy Servo Drive?

[JAZZCNC]

I should point out I mostly use 3mm dia. cutters so this means my direction changes need to be more frequent and smaller. Maybe I'll make a video tomorrow and show you.

Gantry weight I dunno but the whole back is a massive slab of Ali. I guess 60kg.

I doubt it's heavier than My wide all Ali gantry which is 70Kg and I do everything from fine engraving with tiny cutters to Hogging out lumps of ali and don't have any troubles. To be honest if mechanicly sound then I'd put a small wager on that your problem is overtuned motors and not undersized motors.

Again same would kind of happen with closed loop.? The difference being they would or could depending on how much error fault because would still be loosing position due to being overtuned and following error will be reached.

Also what are you using to provide the pulses.? If parallel port then this could also be some of the problem.
The secret to a sound relaible machine is balance and each component needs to match and work nice together with others in the system. One weak link and the machine will be compromised in some way.!!