GRBL CNC Shield + Z Axis servo MIGRBL

63 thoughts on “GRBL CNC Shield + Z Axis servo MIGRBL”

1. hellow~!
   I finally made a drawing machine.
   But there are two problems.
   First, the x and y coordinates are diagonal.
   Second, there is noise from the step motor.
   What should I do?
   Please tell me how.

2. For those who could not get servo working, solution given by Sandeep is. Using LM7805 voltage regulator works. Also tried a step-down buck-converter to make the solution more permanent. Buck-converter solution also works. Looks like all CNC Shields are not made equal and power for servo is not provided by shield. So, LM7805 or buck-converter comes handy in that situation.

   Thanks Sandeep

   1. Thanks

3. sandeep,
   Thank you for this post !!
   I would like also to inform you that this tutorial working,
   with NANO and CNC shield V4 , repaired according to this
   instructable:
   http://www.instructables.com/id/Fix-Cloned-Arduino-NANO-CNC-Shield/
   Thank you again !! Great and detailed tutorial !! 🙂

   1. Thank you !!!

4. Does it work also for Incskape 0.92?

   I got an error using the plug in:

   Traceback (most recent call last):
   File “servo.py”, line 3172, in
   e.affect()
   File “inkex.py”, line 283, in affect
   self.effect()
   File “servo.py”, line 3156, in effect
   self.orientation( self.layers[min(0,len(self.layers)-1)] )
   File “servo.py”, line 3085, in orientation
   doc_height = inkex.unittouu(self.document.getroot().get(‘height’))
   AttributeError: ‘module’ object has no attribute ‘unittouu’

   1. please set the unit PX from mm from document properties before exporting gcode

   2. tengo el mismo error y todo esta en mm ayuda por favor

      “” Traceback (most recent call last):
      File “servo.py”, line 3172, in
      e.affect()
      File “inkex.py”, line 289, in affect
      self.effect()
      File “servo.py”, line 3156, in effect
      self.orientation( self.layers[min(0,len(self.layers)-1)] )
      File “servo.py”, line 3085, in orientation
      doc_height = inkex.unittouu(self.document.getroot().get(‘height’))
      AttributeError: ‘module’ object has no attribute ‘unittouu’ “”

      1. change unit from “px” to “mm” in document properties, just before exporting G-code.

5. Are you realy sure the program doesn’t work with Arduino Mega? Please open the folder cpu_map and ther you will find the files:

   cpu_map_atmega328p
   cpu_map_atmega2560

   The pinage and registers of Atmega are defined there.

   And if you open and look the file spindle_control.c , in line 89, 90 and 91:

   #ifdef VARIABLE_SPINDLE
   // TODO: Install the optional capability for frequency-based output for servos.
   #ifdef CPU_MAP_ATMEGA2560

   Interesting enough, there are some comments in portuguese language (I’m a brazilian guy) in the file spindle_control.c in the function void spindle_init() look from the line 42:

   //spindle_stop();
   OCR_REGISTER = 9; // coloca o servo na posicão inicial normal
   // OCR_REGISTER = 39; // coloca o servo na posicão inicial invertida

   and again in the function void spindle_set_state(uint8_t state, float rpm) from the line 75:

   // Volta para a posição inicial
   OCR_REGISTER = 9; // Posição normal
   // OCR_REGISTER = 39; // Posição invertida

   In fact the MIGRBL can be found in this channel :

   https://www.youtube.com/watch?v=r4rwlRyKqYU

   but having a different name…

6. Olá,
   Estou com problema no servo ele só desce para o angulo zero e fica travado, quando realizo os comandos M3 ele trava em zero e M5 ele destrava mas não sobe o eixo.
   Você saberia me responder o porque disto? Tentei ja trocar servo mas a mesma coisa a extensão tbm

7. Hi, i have a problem in grbl controller that says “buffer size too small, process interrupted” why i have this problem and how i can solve it?

   1. This is not any problem it just a massage from IDE, you can uplode the grbl & ignore the massage

      1. i can send a image of the error to yor gmail? because i cant skip the message and that stop the machine

8. Grbl compiles and all works fine except servo. Can ANYONE suggest what the problem is. Z axis motor still responds to gcode but no servo movement. Servo is
   wired as shown above

9. Same issue here.
   uploaded the firmware to the arduino.
   plug motor as indicated, send command and no motion.

10. Hi Sandeep,
    My Z-Axis is not working(Servo motor not at all moving). I have followed all your suggestions.

    Breaking my head to resolve this issue from last 15days.
    it seems, Pin Z+ not getting signal.
    I have changed Servos, CNC shields, Aurdino boards also. But no use.

    Could you please help me to resolve this issue.

    BR/Sandeep

11. Hi Sir
    I am late commer.
    Sorry to disturb you. Could you please tell me how can I download MI Inscape Extention. The link is not working.

    Regards
    Sen

    1. Link is working fine

12. Hola, buenas tardes. Segui todos los pasos y no logro hacer que el servomotor se mueva. Usted podría decirme cual sería el problema? Porque todo el resto funciona perfectamente, excepto el servomotor.

    GRACIAS!!!

13. 9V is ok!

    1. It is not recommended as per data sheet , but I personally run it on 9V several times without any trouble..

       1. OK! I’ll see how the engine will work.
          Why does the motor p rotate 1/4 turn when setting 2048 steps?

          1. Looks you are using A4988 driver please check you microstep configuration

             1. Yes – I use A4988. In the GRBL configuration I have set 2048 steps

14. How to connect the 28BYJ-48 unipolar stepper motor to the A4988 stepstick? The motor has 5 pins and the stepstick has 4 inputs.

    1. I think you are talking about to convert unipolar to bipolar stepper motor
       for that watch this
       https://www.youtube.com/watch?v=FLJGCZslOcM

       1. I did as in the movie. The engine gets hot.

          1. Please note that the rated voltage for 28byj48 stepper motor is 5VDC it can extended upto 9VDC motors get little hot its ok, if you can able to touch motor for 5 seconds then its not that hot …

15. Hi
    I followed all steps to create G code but when I want to send it via univresal g code sender it says the file is empty and sometime it have error
    and if its possible upload the g code for testing

    1. You gcode file may be empty

       1. it’s not
          when I open it by note pad it have this:

          M5
          G90
          G21
          G1 F2000
          G1 X31.5748 Y30.0769
          M3 S90
          G4 P1
          G1 F2000.000000
          G1 X31.5748 Y33.4808
          G1 X34.5817 Y33.4808
          G1 X34.5817 Y30.0769
          G1 X31.5748 Y30.0769
          M5
          G4 P1
          G1 F2000
          G1 X31.5748 Y9.3738
          M3 S90
          G4 P1
          G1 F2000.000000
          G1 X31.5748 Y26.8374
          G1 X34.5817 Y26.8374
          G1 X34.5817 Y9.3738
          G1 X31.5748 Y9.3738
          M5
          G4 P1
          G1 F2000
          G1 X6.6012 Y9.3738
          M3 S90
          G4 P1
          G1 F2000.000000
          G1 X16.0728 Y21.9371
          G1 X7.7204 Y33.4808
          G1 X11.5792 Y33.4808
          G1 X16.0227 Y27.2978
          G2 X17.3722 Y25.3503 I-52.0521 J-37.5103
          G2 X17.9938 Y24.3379 I-13.4227 J-8.9388
          G2 X18.8491 Y25.6277 I22.6974 J-14.1225
          G2 X19.9316 Y27.0841 I30.0285 J-21.1888
          G1 X24.8595 Y33.4808
          G1 X28.3842 Y33.4808
          G1 X19.7813 Y22.118
          G1 X29.0524 Y9.3738
          G1 X25.0433 Y9.3738
          G1 X18.8792 Y17.9741
          G2 X18.3707 Y18.7203 I29.7407 J20.8139
          G2 X17.8101 Y19.5856 I39.4373 J26.1632
          G2 X16.9804 Y18.2775 I-76.1046 J47.3535
          G2 X16.6408 Y17.7767 I-11.4842 J7.424
          G1 X10.4934 Y9.3738
          G1 X6.6012 Y9.3738
          M5
          G4 P1
          G1 F2000
          G1 X0 Y0

          but when I browse it to the program it says it’s empty

          1. Gcode looks ok do one thing download Camotic gcode simulator from web and simulate you gcode if it’s proceed fine then problem is with not gcode do this and tell me the result

16. Congratulations especially for MIGRBL.
    It works really.
    I suppose that it should work also with Arduino Nano, Pro mini and other based on Atmega 328P am I right?

    What do You thing of using pair of L293D motor drivers for very low budget plotters based on mechanical parts od scrap CD/DVD Roms?

    I am working for such exercise for school elecronics / Ham Radio club as valuable arduino exercise.

    1. Yes it can work with any Atmega 328P CPU, off course you cannot able to use grbl shield if using nano.
       for L293D you need adafruit motor driver shield and makerboat g-code extension for inkscape, and gctrl processing GUI, you cannot use GRBL in this case.

17. thanks for your adviced, i will try

18. hello mr sandeep
    why after send command M3 S90 for move servo, my cnc stop. if i am try to re open port error connection. i am used universal Gcode sender V1.0.9
    iam need your advice

    1. M3 S90 is command to operates Z axis servo
       This also heppens to me many times, so i figured out that when servo motor operates it drain more amps from arduino and reset the arduino due to over current, so I supply 5VDC to servo motor via LM7805 IC, I tap 12VDC from the main supply of GRBL CNC shield to LM7805 and supply 5V to servo motor in this way arduino free from load of this servo, you can do wiring as per the image shown in the link
       https://ibb.co/h8fhg6D

       1. Can you make 1 video on this??

          1. sorry smit….

       2. Yes need to short all gnd of different power source

    2. Sir can I send g code using python to Arduino after uploading GRBL firmware to the Arduino… If yes then how??…
       Please help this will be a great help to my project….
       I hope you will give right solution to my query…
       Thank you

19. What are the dimensions of the X, Y rail rods?

20. hello sir Inkscape Mac OS How to setting MI GRBL Extension

21. hello sir ,every thing is working well except servo motor.its not working at all after all above procedure .Also i applied external power to servo.Now kindly help me

    1. Hola, a mi me ocurre lo mismo. Pudiste encontrar el problema?
       Si es así, te agradecería mucho que me dijeras como hiciste para hacerlo funcionar.

       Gracias!!

22. Hola, me gustaría saber cual es el programa en Arduino que hay que cargar para que comience a realizar las impresiones (dibujos). O eso lo ha de realizar un programa aparte?

    1. First you need to upload GRBL firmware to arduino, then after need to send G-code to arduino to draw image via any G-code sender software..

       1. Sir I need to know that can I send the g code using python to Arduino after uploading GRBL firmware to Arduino.
          If yes then how ??
          Please help me it will be great help fo my project……..
          I hope you will give me the right solution for my query……

23. How much volt of power supply should be given to Cnc shield???
    5,9or12
    Can you print me some 3d printed parts??

    1. GRBL CNC shield can work on 12-36V DC

24. plz help

25. can you give me watsapp

26. Everything became fine
    But when I sent Gicode via universal g-code sender Give me this message”Error expected command letter
    can you help me with a video because my English is not very good
    thanks

    1. We are happy to help you, if you can please send some screen shot of the error it would very helpful to get some solution …

27. Everything became fine
    But when I sent Gicode via universal g-code sender Give me this message”Error expected command letter
    can you help me with a video because my is not very good
    thanks

28. SIR,
    THE 3D PRINTED CLAMPS PLEASE GIVE INFORMATION ABOUT THERE SIZE AND DIMENSIONS. AND WHERE TO GET THEM.
    PLEASE
    Thank you

    1. which 3D parts you are talking about ?

29. Do we save the file in the form of G-code and end up
    Your answer concerns me
    thank you very much

    1. Yes the file is save in form of G-CODE

30. Can this will work with arduino megao ?

    1. No this’ll works only with arduino UNO

       1. please add some information in regards of size and dimension of 3d printed parts.

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