[grbl Issue#1018] Speed & frequency

#1 – gerritv 于 2016-06-16

First recommend that you move to 0.9j as it has many enhancements over 0.8.
This article describes how to set up your driver: https://www.pololu.com/product/1182
Often a combination of current limiting and microstepping cause the symptoms you describe. E.g. if you are using full steps there will likely be sharp noise, using 1/4 step and appropriate change in Grbl for steps/mm you should get a softer noise.

#2 – electrokean 于 2016-06-16

It sounds like you’re in the motors resonance zone. You should switch to microstepping as suggested by @gerritv and then increase your steps per mm appropriately.
You can then increase your max velocity to improve speed to where you want it, although you may also need to tweak acceleration up or down to get the best setting to avoid resonance on the low end, and stalling on the high end.
Pulse widths shouldn’t matter – they just need to be long enough for the driver to see the pulses reliably. Some opto-isolators are slow and need longer pulses. A low pulse rate will limit your maximum velocity, but is otherwise not a problem.

#3 – mihaisalajan 于 2016-06-16

Thank you all for your opinion and suggestions, but i found the problem by chance.

I had to reset the arduino, any setup in $4 or $5 it doesn’t have immediate effect, i need to restart arduino again restart connection between arduino and GRBL controller and surprise the speed was adjusted, and with some small calculation I found my 1µs impuls that is the speed of 1200 mm/min
so every thing is perfect now

@gerritv I will do it today thank you
@electrokean i tried it already by setting the pulse/mm at 100 not 25 and the step at 1/4 but the result was the same as before the distance was correct but without improving the speed or escape the noise

any way now is working fine again, thank you all