Thanks. Then it sound as if we are in the same ballpark at least. I also could find an old datasheet in the net for my motor: it has 2.5mH per phase.
I actually like to print as fast as i can ;). In the past with the original setup i pushed up to 100 mm/s. But right after switching over to the Duet wifi I never quite got it back to work again as good as before ( I think the motors were runing near their current limit before). Still some tuning to do. Small prints are fine now, but with even midsize prints I get now all those layer shifts and that is why i was trying to get the Stall guard activated. And more torque will help me too
Latest posts made by xorlosch
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RE: Stallguard not working
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RE: Stallguard not working
@droftarts : not quite sure what the inductance of the motors is, but it really seems like the low speed is the problem here. As I mentioned the frame and motors of my printer are still the original Ridgidbot, which had some... let's say interesting design choices ;). The X and Y axis were using huge 36 tooth gears (with 2mm width gives about full 2,78 steps/mm). I acutally had bought allready smaller belt gears with 16 tooth but with the old ridgidbot overheating was the bigger problem so i skipped installing those.
But now I will for sure install those! That should bring me then up to 6.25 steps/mm which would corespond to 32mm/s for a reasonable H value of 200. Am I correct? I hope that will work better then. (Which it should as then the motors have more torque at the same time also with the smaller bet gears)
Just for interest: how many full steps does your cartesian printer use per mm? -
RE: Stallguard not working
@Phaedrux with an S value of 7 or lower i detect a lot of false stalls. with a higher vslue i detect no stalls. but eitherway with both higher and lower s values (as low as 3) i could not detect real stalls.
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RE: Stallguard not working
I tried setting up the stall detection but the axis is just too slow for stallguard to work. seems to be better suited for delta printers or core xy than carthesian printers :(. I had to go lower than H50 to detect stalls and then acutally all o them were false and it did not trigger on any real stalls. I will try installing smaller toothed gears for te belts (so that the motor neeeds more stes per mm) but i don't have high hopes. Has anybody got the Stall detection to work with carthesian printer with ow steps per turn?
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RE: Stallguard not working
yes those values I had both set to 70%. now i increased to 82%
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RE: Stallguard not working
Ok that worked. I went to an agressive S-50 H10 and it instantly triggered. So now I have a at least a starting point for finetuning. I will post my settings when i am done (in the next days).
30% I had as reduced power for my stepper motors :M906 X1050 Y1250 Z1100 E900 I30
would that be too low? -
RE: Stallguard not working
but now that I think about it , that might be what stops me here, as the direct driven belts have the low steps per mm values, I might have been slightly below that vaue of 200 steps /s
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RE: Stallguard not working
As I understood the H settings are to prevent too many wrong triggers. Of course I could try to reduce it but 200 (which is also the dfault) should be the correct settings for my motors. And Yes: I started a print ech time I tested if the stal detection was working
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RE: Stallguard not working
the low settings for M92 X and Y should be quite typically for a belt driven carthesian printer. but maybe that is the problem. I just tried again and it still won't register. maybe also my current reduction to 30% is at fault. Or my jerk and acceleartion settings. I give up for now. maybe i can get it to stopp skipping layers by crancking up the current(which my last board did). Or I have to stop using mikrostepping, as that also seem to loose some torque for the single steps
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RE: Stallguard not working
The command is applied. I now try M915 X Y S-50 F1 R2. That should trigger on anything hopefully and then stop the print. how fast I a going is a loaded question. As far as I understood this only works while printing, so I set it u to print something. max speed should be 50 I think. lowest speed?