Re: Where to put the "resolution"? Pulleys, motors, drivers.. ?


Howard Dutton
 

On Thu, Apr 8, 2021 at 05:12 AM, Pedro Miguel Barbosa Moutinho Nunes dos Reis wrote:
Regarding the S109, these are the ones, right?


https://www.aliexpress.com/item/33016392712.html?spm=a2g0o.productlist.0.0.7f0126bbb7K2WD&algo_pvid=14762ba4-0f63-4879-900d-05cce070155d&algo_expid=14762ba4-0f63-4879-900d-05cce070155d-0&btsid=2100bdd716178838146014028ea4c5&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_
Yes, that's an S109.  I have not noticed a user with that exact one but I'd expect it to work.

It requires none of this extra wiring but is limited to one microstep mode where a TMC driver can switch modes (CNCV3 design decision).  This can limit slew speeds but usually an ESP32 is fast enough it doesn't need to switch modes.  It also doesn't need the power up sequence the TMC drivers need (which some ignore,) also mentioned in the Wiki for the CNCV3.

The TMC drivers are in general more accurate with stepper motor motion but at relatively high (say > about 400:1) overall reduction that starts to become irrelevant.

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