Help me get connected to my Duet2Wifi
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What does your M915 command look like?
https://duet3d.dozuki.com/Wiki/Stall_detection_and_sensorless_homing#Section_Sensorless_Homing
Have you calculated what your M915 H value should be and your minimum homing speed?
In your example, remove the entire second homing move. With stall detection you need a short sharp shock during a steady state move. Backing off and slowly approaching from close up isn't going to generate a stall reliably. Since you're stalling the motor to a full step anyway, backing off and rehoming for more accuracy doesn't make sense here like it does when using an endstop switch.
So try this
M400 M913 X70 Y70 ; drop motor current to 70% M400 G91; relative positioning G1 H2 Z10 F12000 ; lift Z relative to current position G1 H1 X-320.5 F10000 ; move quickly to X axis endstop and stop there (first pass) G1 H2 Z-10 F9000 ; lower Z again G90 ; absolute positioning M400 M913 X100 Y100 ; return current to 100% M400@Kwad3d said in Help me get connected to my Duet2Wifi:
My guess is its slightly too sensitive. Im gussing I need to increase the motor current a few percent but want to check
Start with as low a motor current as you can still reliably move with and set the sensitivity to default. Then slowly increase (or decrease) sensitivity from there.
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@Phaedrux So lower the full current setting that was set in the confit tool or the "drop motor" current in the M913 line? If im changing the full current that was set in the config (800) I can do that with a g code command in the console right? what is the code please if so
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I mean lower the dropped current in the M913 command in your homing file.
M906 sets the full current in config.g. That one should be set at ~80% of your motors max current.
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@Phaedrux Ok currently my M913 line is set to %70 for x and Y. lower to %60-65 and retest?
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You can send M913 in the console to lower the current in steps. Send your homing move command each time. When the move doesn't work anymore, you've found the lower limit.
Example
M913 X30
G1 H1 X-300 F10000
M913 X40
G1 H1 X-300 F10000etc
If it still moves reliably sat 30% then maybe stick with that because I don't think you'd get much lower.
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@Phaedrux Today im getting zero movement on homing x. The bed drops then X is just set to 0 while the nozzle is in the center of the bed. I can manually move left and right after the failed homing move. Here is my code for home X at the moment. anything wrong with it? I repeated testing with M913 increments up to 100% I would occasionally get it to home but fails %90 of the time. How do I get it to grind the x axis into the home location? where I want to be is obviously somewhere between there and where Im at now.
M400
M913 X80 Y80 ; drop motor current to 80%
M400
G91; relative positioning
G1 H2 Z10 F12000 ; lift Z relative to current position
G1 H1 X-320.5 F10000 ; move quickly to X axis endstop and stop there (first pass)
G90 ; absolute positioning
M400
M913 X100 Y100 ; return current to 100%
M400 -
I still haven't seen your m915 command. Can you post your config.g file?
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G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"SK GO" ; set printer name
M669 K1 ; select CoreXY mode; Network
M551 P"SK GO" ; set password
M552 S1 ; enable network
M586 P0 S1 ; enable HTTP
M586 P1 S0 ; disable FTP
M586 P2 S0 ; disable Telnet; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S0 ; physical drive 2 goes backwards
M569 P3 S1 ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3 ; set drive mapping
M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X200.00 Y200.00 Z400.00 E420.00 ; set steps per mm
M566 X600.00 Y600.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X3000.00 Y3000.00 Z100.00 E10000.00 ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout; Axis Limits
M208 X10 Y36 Z0 S1 ; set axis minima
M208 X310 Y336 Z320 S0 ; set axis maxima; Endstops
M574 X1 S3 ; configure sensorless endstop for low end on X
M574 Y1 S3 ; configure sensorless endstop for low end on Y; Z-Probe
M950 S0 C"exp.heater3" ; create servo pin 0 for BLTouch
M558 P9 C"^zprobe.in" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds
G31 P500 X-26 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
M557 X36:290 Y46:290 S48 ; define mesh grid; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B1 S1.00 ; enable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S90 ; set temperature limit for heater 0 to 90C
M308 S1 P"e0temp" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S280 ; set temperature limit for heater 1 to 280C; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on; Tools
M563 P0 D0 H1 F0 ; define tool 0
G10 P0 X0 Y0 Z0 ; set tool 0 axis offsets
G10 P0 R0 S0 ; set initial tool 0 active and standby temperatures to 0C; Custom settings are not defined
; Miscellaneous
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss -
May want to increase your max speed and decrease your acceleration.
M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min) M201 X3000.00 Y3000.00 Z100.00 E10000.00 ; set accelerations (mm/s^2)Try
M203 X12000.00 Y12000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min) M201 X1500.00 Y1500.00 Z100.00 E10000.00 ; set accelerations (mm/s^2)It sounds like it's detecting a stall immediately, possibly due to the high acceleration.
Doing this calculation for minimum stall speed would help as well so we know how fast it needs to be going to stall, but not so fast that it stalls prematurely.
Hmin = full_steps_per_rev * rated_current * actual_current/(sqrt(2) * pi * rated_holding_torque) -
@Phaedrux Im confused by the equation.
Hmin = full_steps_per_rev * rated_current * actual_current/(sqrt(2) * pi * rated_holding_torque)
What is sqrt? and this is in algebraic format correct. So I would calculate full steps x rated current x actual current (A) and calculate sqrt x2 then x pi x rated holding (B). then divide a with b right?
I have never had any luck with stall guard in general. Is there a way to turn it off but have senseless homing like on a prusa? Since this is on a coreXY that I will want to print at speeds above 100mm/s It could become a problem could it not?
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@Kwad3d said in Help me get connected to my Duet2Wifi:
Is there a way to turn it off but have senseless homing like on a prusa?
Yes, that's exactly what you're doing now. You don't have to use both. You can use either or.
It would help me to know what your motor model is. Do you know the rated current? If it's detecting a stall already at M913 80% perhaps your M906 current in config.g is set too low.
If you tell me the rated current and whether they are 0.9 or 1.8 degree motors I can calculate the value using my spread sheet.
@Kwad3d said in Help me get connected to my Duet2Wifi:
Since this is on a coreXY that I will want to print at speeds above 100mm/s It could become a problem could it not?
No, no problem at all. Your max speed was limited to 100mm/s in your config.g and I suggested increasing it to 200mm/s, but you could raise that even more if you want.
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@Phaedrux there LDO brand motors on X and Y at 0.9 deg. Model 42STh47 1684MAC Standard size motor. no other information about the motors was provided by the retailer of the machine and I could not find the required info on the LDO site.
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Do they look like this?
https://www.printedsolid.com/products/ldo-nema-17-motor-ldo-42sth47-1684mac
If so, 1.68a rated.
If that's the case, then the current you have set in M906 in your config.g is quite low at 800ma. Try changing that to 1400 instead.
Now your homing file might work better with M913 X70
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@Phaedrux Yes. the # number on the end is different on mine but I think that's a batch number or something
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@Phaedrux WIll that help with the stall issue or can I disable it
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@Phaedrux Does this look ok for my Homex file? I changed the current for x and y already
M400
M913 X70 Y70 ; drop motor current to 70%
M400 G91; relative positioning
G1 H2 Z10 F12000 ; lift Z relative to current position
G1 H1 X-320.5 F10000 ; move quickly to X axis endstop and stop there (first pass)
G90 ; absolute positioning
M400
M913 X100 Y100 ; return current to 100%
M400 -
So at this point you should have
M203 X12000.00 Y12000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min)
M201 X1500.00 Y1500.00 Z100.00 E10000.00 ; set accelerations (mm/s^2)
M906 X1400 Y1400 etc etcThat homing file looks ok, does it work?
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@Phaedrux No same stuff. Bed lowers but the X axis remains motionless and the X location changes to 0. I need to disable the stall detection. I have been printing a long time and that feature will ruin more prints than it will potentially save.
I also had my travel speed set to 300mm/s on the coreXy. So do I need to up my limit to 300 right. Don't have any reason to go beyond that.
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But you don't even have an m915 in your config.g to enable stall detection.
Once it thinks it's homed can you jog the axis around like normal?
Try reducing the speed of the homing move to 6000
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@Kwad3d I never got enough information to solve the equation myself. If stall detection is off then what if preventing the homing procedure. Seems to me it is on and I would rather have it turned off. There has never been a print saved by senseless homing in my shop but I have had several failures so I turn it off on printers like my prusa. Yes after it thinks its homed it moves. just will not move beyond the zero position set by the homing move.
