Hi Hu,
Ok, here is what I know about the handwheel, and steppers in general.
Am I correct when I say that all start/finish of movement on a stepper requires a ramp up/down of the pulse train to avoid losing steps, unless a very low speed is involved
If OK2STOP is enabled, accell/decell is applied at the beginning and end of the travel. But the motor decels as soon as you stop turning the handwheel, so you cannot jog a specific distance
Without OK2STOP each clcik represents a certain movement
Here is the problem, the acell is only applied to the first movement, if you click again there is no ramp
Well actually it depends on how fast you click again, I have the ramps set to be very long so I can observe them, and what happens is that the ramp up starts on the first click, and if the second click is soon enough it will still be ramping up, takes over where the previous click stopped. Am I making sense?
I think this is a problem
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Thanks
Marc |