topic Re: Getting invalid g-code error 20 in ugs in Fusion Manufacture Forum

Getting invalid g-code error 20 in ugs

Anonymous — Wed, 30 May 2018 01:46:32 GMT

Hi everyone. This is my first time using fusion360 for cam and I am getting an invalid g-code error from universal g-code sender:( (error:20) Unsupported or invalid g-code command found in block.(error:20) Unsupported or invalid g-code command found in block.) I am using a bob'scnc e3 machine. I have attached the g-code file as a .txt to see if anyone has any idea of what is wrong. Thank you.

Re: Getting invalid g-code error 20 in ugs

daniel_lyall — Wed, 30 May 2018 07:18:05 GMT

Do you know what G code is the problem

Re: Getting invalid g-code error 20 in ugs

Anonymous — Wed, 30 May 2018 07:23:39 GMT

I'm not really sure but I think that the last line that runs is line 21:

G3 X1.9644 Y0.04 Z0.1078 I-0.0153 J-0.0397 F30

Also i'm using the generic GRBL post processor

Re: Getting invalid g-code error 20 in ugs

daniel_lyall — Wed, 30 May 2018 07:50:55 GMT

Can you post a model this happens on as well, To do this Go to File -> Export and save as a .F3D Archive File and attach it to your next post.

The more info you can post the better the support you can get is more facts and less guess work.

If you Google GRBL G3 you can find a lot of post on this problem.

I would do this before changing anything in the post there is a lot of reasion and G code sample where this fail happens.

Re: Getting invalid g-code error 20 in ugs

Anonymous — Wed, 30 May 2018 07:50:41 GMT

Sure it has happened on both of these models(these are my first two models). Thank you for the help by the way.

Re: Getting invalid g-code error 20 in ugs

daniel_lyall — Wed, 30 May 2018 08:01:30 GMT

it is something to do with the G1, G2 and G3 moves a common reasion will need to be found so a permanent fix can be done to the post. what ADSK may do

Re: Getting invalid g-code error 20 in ugs

Anonymous — Wed, 11 Jul 2018 22:43:02 GMT

What??

I'm having the same problem and can't find a fix.

Re: Getting invalid g-code error 20 in ugs

Anonymous — Thu, 12 Jul 2018 00:11:35 GMT

Sorry I meant to post the solution I found. At the beginning of the g-code, there is a tool change command and my machine doesn't support tool changes. I just deleted these lines

M9
T1 M6
S30000 M3
G54

at the beginning and it worked.

Re: Getting invalid g-code error 20 in ugs

Anonymous — Thu, 12 Jul 2018 16:08:00 GMT

Thank you!!! That was the issue.

Is there a plan to create a post that doesn't include tool changes? It would be great if I didn't have to go in and delete the code for every project.

Thanks again!

Re: Getting invalid g-code error 20 in ugs

rmfolsom — Wed, 10 Jun 2020 12:55:35 GMT

Seems two years later that this problem still persists. I checked all my setting and no where can I find that tool change has been selected, not in the setup, not in the machine, not in the tools. In my case the code is slightly different, but removing it worked. No clue where the half inch end mill came from. I do not have one and it is not in any of my settings. Fusion seems to be just making sh*t up as it goes. Basic GRBL should be basic.

T2 M6
(0pt5 Inch End Mill)
S12000 M3
G54

Re: Getting invalid g-code error 20 in ugs

seth.madore — Wed, 10 Jun 2020 15:55:56 GMT

Hello and thank you for bringing your question to the forums!

Do you have a file that you can share?

Right click on the file in the Data Panel and select "Share Public Link". Copy the link and paste it here.

Re: Getting invalid g-code error 20 in ugs

rmfolsom — Wed, 10 Jun 2020 22:42:32 GMT

https://a360.co/3hgKJYw

Re: Getting invalid g-code error 20 in ugs

seth.madore — Thu, 11 Jun 2020 16:17:11 GMT

The UGS and grbl itself will ignore the T# call out. It is M6 that causes trouble. However, some g codes senders, like the Carbide 3d, do take an M6 since carbide 3d supports that command, which is why it is still in the post.

If you download the most recent grbl post from the download website it should have the M6 turned off by default. It just has not been updated in the local library yet (6/11/2020). https://cam.autodesk.com/hsmposts?p=grbl

-EDIT-

Carbide 3D users should seek out the proper Carbide 3D post processor.

Re: Getting invalid g-code error 20 in ugs

rmfolsom — Thu, 11 Jun 2020 17:55:17 GMT

Thx for following up. The updated post file did indeed remove the M6 and the file now loads into UGS Platform Nightly Build without edits. First few lines of a very simple project are below. Still wondering where (0pt5 Inch End Mill) is coming from? I do not have a 1/2" bit in my Tool Library.

I am hobbyist running a MillRight Mega V. Workflows are only something I dream about. Everything is manual.

(Hello World)
(Can be cut with an eighth or quarter inch vee, ball or end mill)
(Machine)
( vendor: Millright)
( model: Mega V 19x19)
( description: Generic 3-axis, MDF Bed, Homing Switches)
(T2 D=6.35 CR=0 - ZMIN=-2 - flat end mill)
G90 G94
G17
G21
G28 G91 Z0
G90

(TraceBoarder)
T2
(0pt5 Inch End Mill)
S12000 M3
G54
G0 X37.789 Y146.148
Z15
Z5
G1 Z-2 F1000
X243.521
X244.281 Y146.129

Cheers,
Randy