Today I try again. Yesterday it seemed to me that at the first "bump" it worked (the trolley went back) and then at the second no longer because the engine did not stop. I have to check better because I was confused!
Probably as DC42 says in point 2 I will not be able to use the second bump.
Let's see .... today I make other attempts.
Meanwhile, thank you again for your patience!
@Phaedrux said in Homing sensorless:
Serves me right for posting after 1am.
It seems to me that you are in Canada ... I Italy ...
The alarm sounds to me and you go to sleep! eh eh eh
Does not work.
Tried:
with S-50 "
F4800 instead of 3000
Doubt: M915 should be put in "config.g" or in the "home ..." files?
My system is 12 volts .... doesn't it work for this?
@Phaedrux said in Homing sensorless:
@luc said in Homing sensorless:
Sensitivity is S. So try increasing that until it stalls immediately. 64 is the highest value.
M915 X Y S3 F1 H400 R0
(https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing Higher values reduce the sensitivity; lower values make false stall detection)
I do tests starting from -50 and gradually I edit.
For now I thank you very much, for correctness I will update later.
@Phaedrux
If the compilation of the codes is correct and also their positioning in config.g and the various home ...., I try with sensitivity.
More than "stuck" I was uncertain about the correct construction of the "home" files and undecided about the parameters that I should now modify.
If I understand correctly, you suggest me to intervene on:
M915 X Y S3 F1 H400 R0
so I drop H400 to 100 and try (the wiki suggested 400 for 0.9 ° engines)
Then say
"Lower the motor current until you can no longer move the axis and then increase it until you just get reliable movement"
are you referring to M913 or M906?
M906 it seems to me that it is something else or wrong?
"Then you can test stalling itself. You will need to have a speed fast enough to actually produce enough back emf to trigger. So you won't likely be able to do a single fast pass followed by a slower bump pass. Just a single fast move. "
F3000 in the "home ..." file seems adequate ... what do you suggest?
@Phaedrux said in Homing sensorless:
Yes you'll need to tune sensitivity, speed, and motor current.
If you already have endstop switches, why use stall detection?
For sensitivity, speed, and motor current on which parameter do you suggest me to act? On M915? and/or....?
I would like to use sensorless homing as I have transformed X and Y with linear guides and I would like to gain space in their run (if I can)
@Phaedrux said in Homing sensorless:
I think wha tyou have looks correct.
The difference between S1 and H1 is that in newer firmwares S1 has been repurposed for laser control, so it's recommended to use H1 instead for homing moves.
You don't mention what firmware version you are using, so I'm not sure if that is your problem or not.
Have you seen this page?
https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing
What exactly isn't working for you?
Hello and thank you for your interest.
The card is a duet2wifi (V1.04), firmware 2.05.1 that works regularly without sensorless home with the files I wrote above and with the microswitches.
When I wrote the first post I had only set the new files for sensorless homing by reading both the guide you suggested and many other posts found in this forum (I have been reading for 3 days!). For each command I compared with the gcode page (https://duet3d.dozuki.com/Wiki/Gcode) because it is my nature to understand what each gcode and each variable means and what it does.
After a short time, as the new files also seemed to be "ok" to me, and they seemed to have sequential logic, I decided not to wait for the forum's opinion and installed them.
Well so far but the sensorless homing function doesn't work. Already the first X axis when it "home" slams and does not stop the engine.
Now I don't understand if the files are correct and it's just a matter of changing the sensitivity in some gcode or they are wrong.
Note: motor 17HM19-2004S1
All sistem at 12v
Sorry if I write again.
Could anyone help me understand if I am doing it correctly?
Do you need additional information?
I would like to avoid making attempts and causing damage.
Hello guys,
to implement "Homing sensorless" (only X and Y) I have read various posts and also the documentation but I am still confused about my coreXY.
It makes me mad to understand that it should be added in "config.g":
M574 X1 Y1 S3; configure sensorless endstop for low XY
M915 X Y S3 F1 H400 R0; Set X and Y axis Sensitivity (motor 0.9°)
correct?
While it is not clear to me how I have to modify "homex", "homey" and "homeall"
At the moment the configurations are:
homex (homey same but referred to y):
G91; relative positioning
G1 Z5 F6000 S2; lift Z relative to current position
G1 S1 X-305 F3000; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000; go back a few mm
G1 S1 X-305 F600; move slowly to X axis endstop once more (second pass)
G1 Z-5 F6000 S2; lower Z again
G90; absolute positioning
homeall
G91; relative positioning
G1 Z5 F6000 S2; lift Z relative to current position
G1 S1 X-305 Y-305 F3000; move quickly to X or Y endstop and stop there (first pass)
G1 S1 X-305; home X axis
G1 S1 Y-305; home Y axis
G1 X5 Y5 F6000; go back a few mm
G1 S1 X-305 F600; move slowly to X axis endstop once more (second pass)
G1 S1 Y-305; then move slowly to Y axis endstop
G90; absolute positioning
G1 X145 Y145 F6000; go to first bed probe point and home Z
G30
Correct?
I think I have to modify:
homex (homey) like this:
M913 X50 ; reduce motor current to 50% to prevent belts slipping
G91 ; relative positioning
G1 Z5 F6000 S2; lift Z relative to current position
G1 H1 X-305 F3000 ; move quickly to X axis endstop and stop there (first pass)
G1 X5 F6000 ; go back a few mm
G1 H1 X-305 F600; move slowly to X axis endstop once more (second pass)
M913 X100 ; motor currents back to normal
G1 Z-5 F6000 S2; lower Z again
G90 ; absolute positioning
Correct?
homeall
M913 X50 Y50 ; reduce motor current to 50% to prevent belts slipping
G91 ; relative positioning
G1 Z5 F6000 S2 ; lift Z relative to current position
G1 H1 X-305 Y-305 F3000 ; move quickly to X or Y endstop and stop there (first pass)
G1 H1 X-305 ; home X axis
G1 H1 Y-305 ; home Y axis
G1 X5 Y5 F6000 ; go back a few mm
G1 H1 X-305 F600 ; move slowly to X axis endstop once more (second pass)
G1 H1 Y-305 F600 ; then move slowly to Y axis endstop
M913 X100 Y100 ; motor currents back to normal
G90 ; absolute positioning
G1 X145 Y145 F6000 ; go to first bed probe point and home Z
G30 ; home Z by probing the bed
Correct?
I thank you in advance for your patience
Luca
Hi guys, I mounted this LDO engine SLIM_POWER_LDO-42STH25-1404MAC Dc 1.4 Amp (0.9 °) and I set the current M906 = E1100 (79%).
Do you think it is normal that the temperature, after about 1 hour of printing, is about 49°C measured on the back and about 40°C on the side?
(All other XYZ engines are 85% and do not exceed 35°C).
Maybe I have to decrease the current value in M906?
Thanks in advance
Luca
