Hello- Have just finished a build, am using Fusion 360's CAM module to generate generic GRBL that simulates fine. When run, Universal G-Code Sender returns error ID 36 on most lines of the code. The toolpath is a very straightforward 2D contour. Could the issue be the GRBL version, which is now a couple of years old? GRBL is in beta for version 2 - I have 0.9j (or i, can't remember). Is xPro V3 compatible with newer versions of GRBL, such as 1.x? Someone has asked this question on the wiki, and no response. Hoped I might get some info here, thanks. Also, any info on error ID 36 would be helpful, of course.

from Interfacing with Grbl · grbl/grbl Wiki · GitHub "36 There are unused, leftover G-code words that aren't used by any command in the block."

sadly, the grbl post supplied with Fusion360 is not very good at all. Here is a better one GitHub - Strooom/GRBL-Post-Processor: Start and yes, UPGRADE to the latest GRBL (or at least the last 0.9), and don't forget to upgrade your GUI as well if you go to GRBL 1.1, since not all GUI's support the new communication codes. GRBL-panel and UGS and Candle work well so far. Please post the Gcode, I am interested to see what the actual problem is.

Ok, great, will try Stroom. Code is below - very simple code to start, cutting a 180mm doughnut out of 5mm plywood. Thanks very much for the responses. % (1) (T1 D=6 CR=0 - ZMIN=-5 - flat end mill) G90 G94 G17 G21 G28 G91 Z0 G90 (2D Contour3) M9 T1 M6 S20000 M3 G54 M9 G0 X125.2 Y89.4 Z15 Z5 G1 Z1 F500 Z-3.5 F20 X125.8 X126.4 F500 G3 X127 Y90 J0.6 X126.51 Y96 I-37 G1 Z-5 F20 G3 X106.989 Y122.869 I-36.51 J-6 F500 G1 Z-3.5 G3 X95.576 Y126.577 I-16.989 J-32.869 G1 Z-5 F20 G3 X63.989 Y116.314 I-5.576 J-36.577 F500 G1 Z-3.5 G3 X56.936 Y106.606 I26.011 J-26.314 G1 Z-5 F20 G3 Y73.394 I33.064 J-16.606 F500 G1 Z-3.5 G3 X63.989 Y63.686 I33.064 J16.606 G1 Z-5 F20 G3 X95.576 Y53.423 I26.011 J26.314 F500 G1 Z-3.5 G3 X106.989 Y57.131 I-5.576 J36.577 G1 Z-5 F20 G3 X126.51 Y84 I-16.989 J32.869 F500 G1 Z-3.5 G3 X127 Y90 I-36.51 J6 X126.4 Y90.6 I-0.6 G1 X125.2 G0 Z5 X184.8 G1 Z1 F500 Z-3.5 F20 X184.2 X183.6 F500 G3 X183 Y90 J-0.6 G2 X182.806 Y84 I-93 G1 Z-5 F20 G2 X171.317 Y44.873 I-92.806 J6 F500 G1 Z-3.5 G2 X164.83 Y34.778 I-81.317 J45.127 G1 Z-5 F20 G2 X134.011 Y8.073 I-74.83 J55.222 F500 G1 Z-3.5 G2 X123.095 Y3.088 I-44.011 J81.927 G1 Z-5 F20 G2 X82.731 Y-2.716 I-33.095 J86.912 F500 G1 Z-3.5 G2 X70.853 Y-1.008 I7.269 J92.716 G1 Z-5 F20 G2 X33.759 Y15.933 I19.147 J91.008 F500 G1 Z-3.5 G2 X24.69 Y23.791 I56.241 J74.067 G1 Z-5 F20 G2 X2.643 Y58.097 I65.31 J66.209 F500 G1 Z-3.5 G2 X-0.737 Y69.61 I87.357 J31.903 G1 Z-5 F20 G2 Y110.39 I90.737 J20.39 F500 G1 Z-3.5 G2 X2.643 Y121.904 I90.737 J-20.39 G1 Z-5 F20 G2 X24.69 Y156.209 I87.357 J-31.904 F500 G1 Z-3.5 G2 X33.759 Y164.067 I65.31 J-66.209 G1 Z-5 F20 G2 X70.853 Y181.008 I56.241 J-74.067 F500 G1 Z-3.5 G2 X82.731 Y182.716 I19.147 J-91.008 G1 Z-5 F20 G2 X123.095 Y176.912 I7.269 J-92.716 F500 G1 Z-3.5 G2 X134.011 Y171.927 I-33.095 J-86.912 G1 Z-5 F20 G2 X164.83 Y145.223 I-44.011 J-81.927 F500 G1 Z-3.5 G2 X171.317 Y135.127 I-74.83 J-55.223 G1 Z-5 F20 G2 X182.806 Y96 I-81.317 J-45.127 F500 G1 Z-3.5 G2 X183 Y90 I-92.806 J-6 G3 X183.6 Y89.4 I0.6 G1 X184.8 G0 Z15 M9 G28 G91 Z0 G28 X0 Y0 M30 %

thanks apart from the T1 M6 which GRBL cannot handle, just comment it out, I see no errors running in GRLB v1.1

David- Thanks so much for your replies. I downloaded and tried Strooom GRBL post-processor. Still shows errors - the same errors. In looking at the code, it is identical to the code from the Fusion 360 generic GRBL post, other than using G53 and not G28. In looking over the errors (which all say ID 36), I discovered that they only show for lines of code with I, J, or K codes - arcs. Straight moves show ok. I wish I could print or save the logs from UGS, but can't find a way to do that. Any thoughts?

What do you get from a $I command to GRBL? I ran your code through a test Arduino with v1.1 loaded and there were no issues so I think you have an old version of GRBL. Upgrading is easy, just follow the instructions on the wiki Compiling Grbl · gnea/grbl Wiki · GitHub

$I returns 0.9j.20150811 - the version for which Strooom was written, apparently. UGS is version 1.0.9. To be clear, the machine homes perfectly, returns to zero, moves properly in all axes - but UGS returns error ID 36 on any code I, J, K (machine does not move for these).

error 36 means that there is an I J or K on a line WITHOUT a G2 or G3, or it means that on a line with an arc command I J or K is missing. your code has G3 X127 Y90 J0.6 ; J but no I X126.51 Y96 I-37 ; I but no J and 0.9 might be sensitive to that. I tested with V1.1 and it was happy. let me downgrade to 0.9 and see.... now have [0.9j.20160726:] installed.... yours is a year behind.... nope, no errors with your code. so, you need to upgrade GRBL make a note of your $$ settings before you upgrade!