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General Mach Discussion / Re: Z-Axis Not Always Positioned Correctly
« on: December 13, 2015, 01:38:38 AM »Quote
Do you think reducing the microstepping on the Z Axis driver so it takes less pulses to move 1" will have any impact on the results?
It should not make any difference unless you PC is just not up to the task.
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The pulse width is set to 5us for step/dir on all axis. The TI driver has a minimum pulse width of 1.9us so this should be OK, right?
Try some experimentation here to get the smoothest motor motion (2uS gives me the best performance).
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I was running the driver test and checking all frequencies. Even up to 100kHz it reports the system is OK. I noticed that up to 65kHz the CPU usage is less than 5% but 100kHz is ~50% but I don't see any reason to push it that high. When I look at Max Variation I see mostly repeatable spikes and values of 15us or 23us. This doesn't seem to change when I change the frequency but occasionally I see nice smooth line aith maybe variations of 5-8us. Is ~20us variation something to worry about? Should I break out the scope and see what the step pulses actually look like?
Unless you definitely need a higher kernel speed (to achieve the desired rapids) then use 25kHz.
Tweakie.