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General Mach Discussion / Re: CS Labs CSMIO/P-A
« on: September 21, 2018, 03:21:41 AM »Hi,
good news.QuoteSet the drive to max rpm of 1000 which give me 5m minute and re-autotuned the CSMIOI think this is a mistake, the drive and servo should be programmed for maximum speed (3000rpm) but the 5m/min axis speed limitation
should be in Mach.
A max servo speed setting is useful if there is some VNE (velocity never exceeded) like leadscrew whip or voltage overload on deceleration
for instance. Normal axis speed settings are rightly the province of the motion planner, Mach in this case.
Craig
Not sure I agree with this. I have had first hand experience of mismatched velocities causing issues. I was helping a friend retrofit a lathe and we had a servo on the turret. He had the drive set at the default 4000rpm but in Mach it was set to the equivalent of maybe 1000 RPM. He just could not tune it, when I told him to drop the drive down to the equivalent rpm the tuning was easy. Now there was a large disparity between the two rpms initially and a smaller difference may not matter but I personally think a match is the best route.
Hi
Can anyone explain the acceleration setting in Mach.
E.g. 1000/s/s
What exactly does that equate to?
Is it 1000/60/60 Which would be 0.27 seconds to reach velocity target.
My drive is factory set to reach desired velocity in 30mili secs.
Mick
The acceleration in the drive will be of no consequence as you are using Mach to command the drive so the acceleration will be at the rate set in Mach and not the drive.
As for 1000mm/s/s it simply means the axis will accelerate and reach 1000mm/s in one second, 2000mm/s in 2 seconds etc. Your Velocity is set in Mach in mm/min so 1000mm/min velocity will be 1000/60 = 16.7mm/s With an accel of 1000mm/s/s you would reach your 1000mm/min in 0.017seconds