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Measure the M907 code force with a scale issues with G code


Bluebull
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Posted (edited) · Measure the M907 code force with a scale issues with G code

Hey :)

I was trying to proove the fact that the M907 command does not work,.. or will it maybe? and how far will it work,..

ok, I thought around a test bench, to measure the force of the extruder ,.. or simply to place a scale on the bed, position the extruder without the nozzle (olsson block makes it possible) over the scale and extrude...

things go wrong at the code,..

I tried around with several codes, and I can send around the head, but I cant feed the filament,.. it ignores my commands in the gcode file?! is the a safety issue in the firmware that provides filament feeding under a point of temperature?

my gcode..

G90 ; use absolute coordinates

M82 ; set e codes absolute

M106 S0 ; fans target

M140 S25 ; Bed target temp

M190 S25 ; Wait for bed current temp to reach target temp.

M104 S25 T0 ; extruder target temp

M109 S25 T0 ; Wait for extruder current temp to reach target temp.

M907 E1400 ; increase extruder current

G28 ; home all axes

G1 X100 Y100 F3000 ; bring extruder to front

G92 E0 ; zero the extruded length

G1 Z100 ; lower

G1 E19 F200 ; purge nozzle quickly

G1 E26 F60 ; purge nozzle slowly

G92 E0 ; zero the extruded length again

G1 E-5.5 F400 ; retract

M84 ; disable motors

I tried to remove the commands for heating bed and nozzle ect,.. no effect,.. the head goes where I want him to go, but it does not feed material ?!

material settings are also changed,... no effect 25° on both

anyone an idea?

Edited by Guest
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    Posted · Measure the M907 code force with a scale issues with G code

    is the a safety issue in the firmware that provides filament feeding under a point of temperature?

     

    *sigh*

    https://github.com/Ultimaker/Ultimaker2Marlin/blob/master/Marlin/Configuration.h#L266

     

    #define EXTRUDE_MINTEMP 170

     

    M302: Allow cold extrudes

    You're talking about an Ultimaker2, right? M907 changes the motor current, but AFAIK there is no linearly dependency between torque and current.

    What are you trying to prove....and why...? (just curious)

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    Posted (edited) · Measure the M907 code force with a scale issues with G code

     

    is the a safety issue in the firmware that provides filament feeding under a point of temperature?

     

    *sigh*

    https://github.com/Ultimaker/Ultimaker2Marlin/blob/master/Marlin/Configuration.h#L266

     

    #define EXTRUDE_MINTEMP 170

     

    M302: Allow cold extrudes

    You're talking about an Ultimaker2, right? M907 changes the motor current, but AFAIK there is no linearly dependency between torque and current.

    What are you trying to prove....and why...? (just curious)

     

    good morning :)

    thanks for the answer :)... M302 solved the problem (Y)

    first of all, I would like to compare the force of the extruder with other people, and proove that my nema looses steps more often the older it gets, now I have 500h on it, and I feel the problem gets bigger,.. I know nema's are made for a lot more than 500h :)but something is hapening there,...

    then I want to know how effective it is to turn the current up, do a diagram force on current, and proove that it does not take a big advantage see what the heat does on it,.. ect.

    next step is a design with a gearbox for the extruder, it drives me nuts to go 25mm/s...

    Edited by Guest
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    Posted · Measure the M907 code force with a scale issues with G code

    then I want to know how effective it is to turn the current up, do a diagram force on current, and proove that it does not take a big advantage see what the heat does on it,.. ect.

     

    Thanks for the explanation, and keep in mind that the chance to loose steps increases with an overheated stepper driver...

    Don't forget to make some additional printing tests with _lower_ current.

    Good luck!

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    Posted · Measure the M907 code force with a scale issues with G code

    I gave it a try this morning, and compared with other guys my results are very poor!

    #1 2.200g

    #2 1.900g

    #3 1.700g

    so every step missing the force decreases :/

    on a cold nema,.. thats bad! no filament slip - I have seen guys lifting 10kg with their original feeders!

    Maybe some of you would be able to do the same test,.. to get some comparable data,..

    olsson block required,...

    remove the nozzle, cool it down

    customize the code to position the the head over a kitchen scale scale

    use this code as reference

     

    G90 ; use absolute coordinates

    M82 ; set e codes absolute

    M106 S0 ; fans target

    M140 S25 ; Bed target temp

    M190 S25 ; Wait for bed current temp to reach target temp.

    M104 S25 T0 ; extruder target temp

    M109 S25 T0 ; Wait for extruder current temp to reach target temp.

    M907 E1400 ; increase extruder current

    G28 ; home all axes

    G1 X100 Y100 F3000 ; bring extruder over the scale

    G92 E0 ; zero the extruded length

    G1 Z100 ; lower

    G1 E19 F200 ; purge nozzle quickly

    G1 E26 F60 ; purge nozzle slowly

    G92 E0 ; zero the extruded length again

    G1 E-5.5 F400 ; retract

    M84 ; disable motors

    now watch the scale ;)

    after the test, about 10mm of filament should stuck out of the head, cut it for the next test, to make sure that the feeder does not mill the filament on the same position again...

    and please show your results

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