steppers with lots of Amp... + M906 command
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@phaedrux said in steppers with lots of Amp... + M906 command:
@dc42 Not to hijack the thread, but this makes me curious what the step rate of the Duet 3 will be with a CPU that appears to be about 3x faster. And as a knock on from that, would it be possible to run in native 256x microstepping mode for all axis?
Although the SAME70 that we use on the prototype Duet 3 can do 300MHz, we currently run it at 240MHz because it makes it easier to sync the expansion boards with the main board. This is twice the clock rate of the SAM4E on the Duet 2. Performance doesn't scale with CPU speed because higher speeds need a larger number of flash wait states to be used, although the SAME70 has a cache that helps with this.
I doubt that it will be possible to run with native x256 microstepping on deltas even with Duet 3. However, the stepper drivers support interpolation to x256 from any microstepping, so you would be able to use e.g. x64 interpolated to x256.
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- pulleyRadius? -> Of which pulley, the "main" pulley?
The pulley fixed to the motor shaft.
Thought about it after working for weeks on the hardware, sorry for coming back so late: In a direct-drive-system: yes the pulley attached to the motor, but in a system where the "gear" is realized also with a pulley this could be confusing, so for me I understand you here: In a load/mass-finally-driven-by-pulley-system the "diameter" (pitch) "neutrale Fase" of that "final" pulley moving/attached to the main-mass/toolhead? Am I going way off road here or is that a good assumption?
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To summarize things up:
In the end, the all-integrated-closed-loop JMC-stepper where the bottle neck because instead of T2.5 what was printed in their datasheet they had to be minimum T3.2, slowing things down...See thread here:
https://forum.duet3d.com/topic/8847/external-driver-ihss60-connection-question/24I can see now the benefit of an all integrated solution Cannot wait to see what the duet3 will be capable off!
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@dc42 said in steppers with lots of Amp... + M906 command:
@phaedrux said in steppers with lots of Amp... + M906 command:
@dc42 Not to hijack the thread, but this makes me curious what the step rate of the Duet 3 will be with a CPU that appears to be about 3x faster. And as a knock on from that, would it be possible to run in native 256x microstepping mode for all axis?
Although the SAME70 that we use on the prototype Duet 3 can do 300MHz, we currently run it at 240MHz because it makes it easier to sync the expansion boards with the main board. This is twice the clock rate of the SAM4E on the Duet 2. Performance doesn't scale with CPU speed because higher speeds need a larger number of flash wait states to be used, although the SAME70 has a cache that helps with this.
I doubt that it will be possible to run with native x256 microstepping on deltas even with Duet 3. However, the stepper drivers support interpolation to x256 from any microstepping, so you would be able to use e.g. x64 interpolated to x256.
I hope you find time (most people do not have any time any more nowadays ) to iterate on the underneath-trinamic-drivers-pcb to have some very good heat-handling either through thick copper-spreads, Vias, possible fan-mount-holes, etc, pp. ... only writing this, because I hope in a year or two the duet3 could be a really great upgrade for the just finished build! Not only because of its new features but also because of top-end-speed and ac-/deceleration... Cheers!