Unable to get sensorless homing working....

gloomyandy

@Chriss Actually I think your problem is this line:

G1 H4 X260 F8000

You are using a H4 move you need to be using a H1 move. See: https://docs.duet3d.com/User_manual/Reference/Gcodes#g0g1-h-and-s-parameter

Oh and where was the line you quoted in the documentation?

Chriss

@gloomyandy True.. you are right... two mistakes... the G1 and the endstops at the wrong side.

https://docs.duet3d.com/User_manual/Connecting_hardware/Sensors_stall_detection#background-on-stall-detection

Is that not true anymore?

Cheers, Chriss

gloomyandy

@Chriss Honestly I'm not sure, that statement in the docs is a little ambiguous and I can't think of any reason why stall detection would only work on the low end. Having said that I've never used it on the high end. Try it and see if it works.

Chriss

@gloomyandy
I tried it all the time with the high end and we know now that it is working after the parameter "nightmare". Maybe something for @droftarts ? I will play a bit more with x at the low end for now. I would like to have Y on the high end for optical reasons. Let's see how it works there than.

Cheers, Chriss

droftarts

@Chriss I've asked @dc42 if that is still correct, and just having a look through the release notes to see if/when it changed.

Ian

droftarts

@Chriss I can't see anywhere where this condition has changed, so I would assume that you should home at the low end. I haven't heard back from @dc42 as yet.

Ian

Chriss

@droftarts I will do. Let's wait what David will tell us.

droftarts

@Chriss @dc42 says

It's always been possible to put it at the high end.

So I’ve no idea why that statement is in the instructions! I’ll test it and update documentation tomorrow.

Ian

Chriss

@droftarts I can tell you that it is working on the high end. My problem came from the G1 H4 instead of using G1 H1.

moth4017

@gloomyandy i use high end sensorless homing ok. i use Y high , x low

dc42

@Chriss the sentence is "For example, M574 X1 S2 and M574 Y1 S3 sets the X and Y endstops to sensorless homing at the axes low end". It's an example. However, it's unclear to me what the following sentence "This is required." refers to, or why it's there at all.

droftarts

@dc42 It was in the dozuki page, seems to refer to it being a requirement to set M574 to S3, now I reread it. Not that sensorless homing has to be at the low end. I'll edit the text to make that clear.

Ian

Chriss

@droftarts @dc42

I think that the "This is required" reveres to the part 'Change your endstop type to "sensorless" in config.g. T' when I read now slowly through it. Anyway, it is a bit misleading, at least for none native speakers and I would remove it.

And the next step is not 100% correct in my opinion, it says: ". Do not press "yes" for restart. There are other changes that must still be made."
Yes, other changes are required, but none oof them are in the config.g and can be done without a reboot or a reread of the config.g.

Cheers, Chriss

droftarts

@Chriss I've changed the wording on those steps. As it's all required, I took out the 'required'! Also made it clear sensorless homing can be either end of the axis, and that a restart is optional at that point.
https://docs.duet3d.com/en/User_manual/Connecting_hardware/Sensors_stall_detection#configuring-sensorless-homing

Ian

Chriss

@droftarts Thanks a lot... it looks much better now. At least to me.