GRBL Multi-Axis Post Processor

[tsmarks]

I am piecing together a post processor script for multi-axis GRBL machines.  (i.e. Arduino Mega with a 6 Axis)  I have successfully tested the 4th axis function.  With my limited experience, I think it works flawlessly.  

I would like to give back to the community by sharing the script. (attached below) And, I would like some feedback/testing.  If you have a multi-axis GRBL machine, give it a try and let me know what works or doesn't.

[stnly_cry]

I'm using an open builds 3 axis machine with the Y converted to a rotary. Using this post how would I change the script to achieve this. I have not edited a post before. Everything looks fine on the CAM, but I'm getting a fail to post with the error "direction not supported for machine configuration "

 

[ethier.jeanpierre]

To my knowledge this version of GRBL is for 4,5 axis controllers with
the mega5x firmware using the arduino mega 2560 controller and the 5
axis ramps 1.5-1.6 board using separate drivers, i believe using the Y
axis as the 4 th axis, will generate an error, also, you need to edit
your machine configuration for 5 axis in the machine config in fusion
360.
Hope this info Helps !

Jean-pierre

[stnly_cry]

I used one of the above mentioned post edits grbl6axis (2) from engine guy. It sent the code, but the machine had an error 20 code, unrecognized gcode. I attemped to edit the post and remove the A and C axis since im only using B, but the post failed to process. Im sure i did something wrong in the edit. Again im using a 3 axis open builds with the Y as the rotary. I tried to link the post but i cant seem to get it to paste in here. Is anyone able to help with editing the post processor to suit this machine?

[engineguy]

@stnly_cry 

Try the attached PP, I have set it to just output the X/Y/Z and B axis, hopefully it will work for you.

[stnly_cry]

I'm still having the same issue, but I think it may be within fusion. I aligned the setup with X along the centerline or length of the part, since my gantry is fixed and the X moves along it, but when I choose the rotary plug in for for the tool path it wants to make X the rotary axis. It will fail to send code this way. If I set it as Y as the centerline it will send the gcode, but the code shows Y and B as having movement. I think that may be why it's sending the error 20 code on the machine with the contradicting movements to the same motor.

@engineguy 

[ratan98manish]

i am having issue in it while i am using 4th and 5th axis its getting zero again and again

like i firstly doing face from z then turn it 90 degree for doing facing both 4 sides of 

its turns well

but when it has to be rotate about 90 , 180 , 270 ,360 degree

but after doing first opertion at (0 or 360) after turning  it goes again in top postion again to  0 but it has to go in 90 . 

its exporting coordinates is not correct

if i going to correct it manually editing in gcode for A and B axises then it works very good but when i sent it through by post processor it goes wrong 

i need help in making postprocesor  for axis 4 and 5 for fusion 360 please help 

[ethier.jeanpierre]

Hi guy's, its me again with a weird one,   I get a failed to generate  tool path using the grbl post processor  when i setup mY  tool setting, in the section  where you define  either  flood or mist  this is where it gets weird  ,  If I choose either   flood or mist  no issues there, but if I  choose flood and mist  the post processor  comes up with an error !   thanks.

JeanPierre

[ezinser]

Thanks for posting this, I am building a cnc using GRBL5x , so your post will surely be very helpful. If I have any problems I will let you know.

Best

[nickPB4HT]

I´ll gave the PP a try but fusion reported that the machine simulation is not working with this PP. 

Is there any chance to get it working as the simulation is essential for the multi-axis work?

[tsmarks]

Unfortunately, my account no longer has access to simulations. I
can't test or work on this.

Tim

[godeye]

hi 

i want to creat 5 axis cnc wich is going to be (BC) head_table architecture the axis B attched on the head and the axis C attechedto the table , is it possible to use this post processor to generate gcode or there is pre programmed post processors in fusion .

thanks,

[godeye]

 i want to creat 5 axis cnc machine with BC head_table architecture , the B axis attached to the head and the C axis attached to the table with 360 degrees  , is it possible to use this post processor to generate gcode or there is preprogrammed post processor in fusion 360. 

thanks,

[sales]

These post processors are working nicely! I have my rotational axis aligned with my Y axis on the router table and "B" seems the appropriate output for these moves, but is what would be the procedure for altering this PP to output rotational moves to A instead of B? I'm asking because depending on the grblHAL controller used, B may not work. Any input would be welcome. I can open the cps and look, but it seems quite daunting. Perhaps a quick and dirty guide, "alter these lines to change angle output to A," would be very helpful.

Thanks for this!