Hard to tell from a video, but it looks to be running smoothly without whipping, which is good.

Quote Originally Posted by Ricardoco
Ok let me see, its showing 100 on the DRO when it is moving 1000 so that is a 10th so steps per in motor tuning should read 200 x 10 = 2000 and then X100 should move the gantry 100mm yes?
If the step/mm value before, which caused it to move 100cm when commanded 100mm was accurate, then you just need to multiply it by 10.

There's a bit more to it though. You need to make sure that you don't hit the kernel frequency limit in Mach3. It's best if you can to use the lowest frequency, which is 25kHz. This means the port will output a maximum of 25000 pulses per second, so if you divide that by the step/mm value you get the software limited maximum feedrate. For example if it's set to 2000 step/mm, then that's 25000/2000=12.5mm/s or 750mm/min. If that feed-rate is too low, then you either need to reduce the microstepping resolution (e.g quater stepping instead of 1/8th) or raise the kernel frequency.