Hi everyone, I had some trouble trying to engrave my name on my new C-Beam, please see attached. I don't yet understand G-Code and would appreciate any help rectifying the gouging that happened at the start of my code. I am using a V-bit at speed 6 on a makita. I used fusion 360 with GRBL post processing and I believe I have Grbl 0.9j (flashed on a Grbl AOI from 3dtek.xyz). Any input is greatly appreciated. Here's the code: Code: % (0005) (Extruded Rob trace v4) (T1 D=3 CR=0 - ZMIN=0 - flat end mill) G90 G94 G17 G21 G28 G91 Z0 G90 (Trace2) M9 T1 M6 S18000 M3 G54 M9 G0 X25.01 Y55.283 Z10 Z5 G1 Z0 F720 Y26.65 X28.799 Y39.365 X33.282 X33.458 X33.547 Y39.364 X33.635 Y39.363 X33.723 Y39.362 X33.812 Y39.361 X33.9 Y39.359 X33.988 Y39.356 X34.076 Y39.353 X34.164 Y39.349 X34.252 Y39.345 X34.34 Y39.339 X34.428 Y39.333 X34.515 Y39.325 X34.603 Y39.317 X34.691 Y39.307 X34.778 Y39.298 X34.866 Y39.287 X34.953 Y39.276 X35.041 Y39.264 X35.216 Y39.24 X35.303 Y39.228 X35.379 Y39.205 X35.531 Y39.16 X35.606 Y39.136 X35.682 Y39.112 X35.757 Y39.088 X35.832 Y39.062 X35.906 Y39.036 X35.98 Y39.009 X36.054 Y38.98 X36.127 Y38.951 X36.199 Y38.919 X36.271 Y38.887 X36.342 Y38.853 X36.412 Y38.818 X36.482 Y38.782 X36.552 Y38.744 X36.621 Y38.706 X36.69 Y38.667 X36.758 Y38.628 X36.827 Y38.588 X36.963 Y38.507 X37.032 Y38.466 X37.211 Y38.327 X37.301 Y38.257 X37.39 Y38.186 X37.478 Y38.115 X37.566 Y38.043 X37.653 Y37.97 X37.738 Y37.896 X37.823 Y37.82 X37.906 Y37.744 X37.988 Y37.666 X38.068 Y37.586 X38.147 Y37.505 X38.224 Y37.422 X38.301 Y37.339 X38.376 Y37.254 X38.45 Y37.168 X38.524 Y37.082 X38.597 Y36.995 X38.669 Y36.907 X38.741 Y36.819 X38.813 Y36.73 X38.884 Y36.641 X38.955 Y36.552 X39.194 Y36.231 X39.314 Y36.071 X39.433 Y35.91 X39.552 Y35.749 X39.67 Y35.588 X39.788 Y35.426 X39.905 Y35.264 X40.021 Y35.101 X40.137 Y34.938 X40.252 Y34.774 X40.366 Y34.61 X40.479 Y34.445 X40.591 Y34.279 X40.703 Y34.113 X40.814 Y33.947 X40.925 Y33.78 X41.035 Y33.613 X41.145 Y33.446 X41.254 Y33.278 X41.363 Y33.111 X41.69 Y32.607 X45.479 Y26.65 X50.244 X45.264 Y34.443 X45.148 Y34.614 X45.031 Y34.785 X44.914 Y34.955 X44.797 Y35.125 X44.678 Y35.294 X44.559 Y35.462 X44.438 Y35.63 X44.317 Y35.796 X44.193 Y35.961 X44.068 Y36.125 X43.94 Y36.286 X43.811 Y36.446 X43.679 Y36.604 X43.545 Y36.761 X43.409 Y36.915 X43.271 Y37.067 X43.13 Y37.219 X42.989 Y37.368 X42.846 Y37.517 X42.702 Y37.665 X42.557 Y37.812 X42.411 Y37.959 X42.265 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X83.536 Y44.83 X83.727 Y44.863 X83.919 Y44.893 X84.113 Y44.92 X84.307 Y44.945 X84.502 Y44.97 X84.693 Y44.947 X84.883 Y44.923 X85.072 Y44.898 X85.26 Y44.87 X85.446 Y44.839 X85.631 Y44.803 X85.813 Y44.763 X85.992 Y44.717 X86.168 Y44.665 X86.341 Y44.605 X86.509 Y44.537 X86.673 Y44.46 X86.833 Y44.374 X86.989 Y44.279 X87.14 Y44.177 X87.289 Y44.068 X87.434 Y43.952 X87.577 Y43.832 X87.717 Y43.706 X87.856 Y43.577 X87.993 Y43.445 X88.129 Y43.31 X88.264 Y43.174 X88.399 Y43.037 X88.533 Y42.806 X88.666 Y42.576 X88.797 Y42.345 X88.924 Y42.113 X89.048 Y41.879 X89.167 Y41.645 X89.28 Y41.408 X89.385 Y41.169 X89.482 Y40.928 X89.57 Y40.685 X89.648 Y40.438 X89.715 Y40.188 X89.773 Y39.936 X89.822 Y39.68 X89.864 Y39.423 X89.898 Y39.164 X89.926 Y38.902 X89.948 Y38.639 X89.966 Y38.375 X89.979 Y38.11 X89.99 Y37.843 X89.998 Y37.576 X90.004 Y37.308 X90.01 Y37.041 X90.003 Y36.773 X89.994 Y36.506 X89.984 Y36.239 X89.972 Y35.973 X89.956 Y35.708 X89.937 Y35.444 X89.912 Y35.181 X89.882 Y34.921 X89.845 Y34.662 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Y32.002 X79.678 Y32.217 X79.592 Y32.432 X79.509 Y32.648 X79.428 Y32.865 X79.351 Y33.082 X79.278 Y33.3 X79.21 Y33.519 X79.148 Y33.74 X79.093 Y33.961 X79.044 Y34.185 X79.003 Y34.41 X78.967 Y34.636 X78.937 Y34.863 X78.912 Y35.091 X78.893 Y35.32 X78.877 Y35.551 X78.864 Y35.782 X78.855 Y36.013 X78.849 Y36.245 X78.844 Y36.478 X78.841 Y36.711 X78.84 Y36.944 X78.838 Y37.177 X78.847 Y37.438 X78.856 Y37.698 X78.867 Y37.957 X78.881 Y38.216 X78.897 Y38.474 X78.918 Y38.73 X78.943 Y38.985 X78.974 Y39.239 X79.012 Y39.49 X79.057 Y39.739 X79.109 Y39.986 X79.171 Y40.23 X79.242 Y40.471 X79.324 Y40.708 X79.415 Y40.943 X79.515 Y41.175 X79.623 Y41.404 X79.738 Y41.632 X79.859 Y41.857 X79.985 Y42.081 X80.115 Y42.304 X80.247 Y42.526 X80.382 Y42.747 X80.518 Y42.968 X80.656 Y43.109 X80.794 Y43.249 X80.933 Y43.387 X81.073 Y43.523 X81.215 Y43.656 X81.358 Y43.785 X81.504 Y43.91 X81.653 Y44.028 X81.804 Y44.141 X81.959 Y44.247 X82.118 Y44.345 Z5 G0 Z10 M9 G28 G91 Z0 G28 X0 Y0 M30 %
This is the beginning of my analysis. I don't see anything wrong. Code: % (0005) (Extruded Rob trace v4) (T1 D=3 CR=0 - ZMIN=0 - flat end mill) G90 G94 ; Set to Absolute Positioning, Feed Rate Mode G17 ; Plane Selection XY G21 ; Set Units to Millimeters G28 G91 Z0 ; Move to origin, Set to Relative Positioning, zero Z axis G90 ; Set to Absolute Positioning, (Trace2) M9 ; Coolant Off T1 M6 ; Select tool S18000 M3 ; Speed 18000 G54 ; Coordinate System Select M9 ; Collant off G0 X25.01 Y55.283 ; Rapid linear Move Z10 ; Z up 10mm Z5 ; Z Down 5mm G1 Z0 F720 ; Linear Move Z down 5 mm
the problem was discussed on this site just the other day (-: your post processor is not raising Z to the safe height before all motion. I will add comments to the code below to explain what is happening % (0005) (Extruded Rob trace v4) (T1 D=3 CR=0 - ZMIN=0 - flat end mill) G90 G94 G17 G21 G28 G91 Z0 ; move to G28 preset position, but force Z to level 0 problem is that Z=0 is the cutting depth in your case G90 (Trace2) M9 T1 M6 S18000 M3 G54 M9 G0 X25.01 Y55.283 ; go to start of cut Z10 ; raise Z Z5 ; drop Z again, I think you set safe height to 5mm? G1 Z0 F720 ; plunge into the work , down to Z=0 Y26.65 ; start cutting the R X28.799 Y39.365 X33.282 X33.458 X33.547 Y39.364 X33.635 Y39.363 X33.723 Y39.362 X33.812 Y39.361 X33.9 Y39.359 then you will see, between letters is raises to safe height correctly X37.952 Y55.281 X37.705 Y55.283 X25.01 Z5 ; raise to safe height G0 X28.799 Y52.119 ; go to new letter G1 Z0 F720 ; plunge to start cut X37.862 X38.071 Y52.114 X38.28 Y52.109 then at the end it does the G28 ... Z0 thing again and cuts when it should not. So I did some googling and found these 2 pages Safe Z axis move - Autodesk Community Solved: Tool Starting Position - Autodesk Community They tell me that Fusion is expecting the machine to conform to industry standard that says that machine Z0 is at the top of the Z travel. From this I assume that your machine does not have home switches, or if it does, the Z home is not at the top of travel. What to do? Switch the machine off manually wind Z to the top of travel (and X to the right and Y to the back) switch the machine on set up G28 to a safe place away from the work now set up your part using the G54 work co-ordinate system (this is what the 'set axis 0' buttons in UGS and other GRBL GUI's do) Now your fusion code should work fine because your machine is set up correctly. Once you have done this you can do G53 Z0 G53 X0 Y0 before you turn the machine off which will park it in the correct position so that when you turn it on the machine home is correct. In some GUI's you can set this as a macro for easy one click usage. If you don't know what a work co-ordinate system is then read this LinuxCNC Documentation Wiki: CoordinateSystems I would also suggest changing the 0,0,0 point in Fusion to be the top of the workpiece. Let us know how it goes...
Thank you for your reply! I don't have limit switches and have been clueless about the coordinate system thus far. I use chilipeppr's 'zero out' button when I manually move the axis' to the work piece. It will take me some time to digest your wonderfully thorough reply. Thanks again. Cheers, Rob
I have read through your reply and the links a couple of times now. I'm still unsure how to set G28 in step 4 of your solution.
Can be just o,o,o machine coordinates, so long as going there at the beginning of the program, and at the end, will not harm anything.
Okay, I've read these: G28 G-Code: Return to Reference Point G Codes G-Code - ShapeOko Part Zero, Program Zero, Touch Offs, and Zeroing for CNC Programming Configuring Grbl v0.9 · grbl/grbl Wiki · GitHub ctrl-f 'G28' But I think the penny dropped after reading this: http://www.diymachining.com/how-to-run-a-gshield-cnc-machine-without-limit-switches/ So I'm going to try this: Jog Z to the top, X to the right and Y to the back. Reset GRBL Jog closer to the part but well away from it type G28.1 Jog to 'part zero'/work zero Hit 'Zero out' in chilipeppr or type G10 P1 L20 (or G92 X0 Y0 Z0) in the serial prompt Run the job Does that sound about right? Do I need to enable homing in my grbl settings?
That seems to be an issue, chilipeppr uses G92 X0 Y0 Z0 as the 'zero out' button I keep using. I'll switch to UGS. I'm not sure what I have done this time! Attached is my latest failure, Fusion 360 file and here's the G-Code: Code: % (1010) (big keychain) (T1 D=5 CR=0 - ZMIN=-9 - flat end mill) G90 G94 G17 G21 G28 G91 Z0 G90 (2D Pocket1) M9 T1 M6 S18000 M3 G54 M9 G0 X25.842 Y35.532 Z15 Z5 G1 Z3 F960 G2 X25.817 Y35.559 Z2.812 I7.802 J7.325 X25.747 Y35.635 Z2.652 I7.827 J7.298 X25.642 Y35.751 Z2.543 I7.897 J7.222 X25.52 Y35.891 Z2.5 I8.002 J7.106 X33.613 Y53.558 Z1.649 I8.124 J6.966 X41.15 Y35.229 Z0.765 I0.031 J-10.702 G1 X43.494 Y30.821 Z0.59 X47.712 Y28.667 Z0.425 X47.858 Y28.82 Z0.417 X45.354 Y33.839 Z0.222 G2 X45.355 Y36.52 Z0.125 I2.684 J1.339 G1 X46.089 Y37.987 Z0.067 X46.28 Y38.857 Z0.036 G2 X48.31 Y41.073 Z-0.074 I2.93 J-0.646 G1 X53.639 Y42.749 Z-0.269 X53.63 Y42.956 Z-0.276 X48.266 Y44.735 Z-0.473 G2 X46.421 Y46.477 Z-0.565 I0.944 J2.848 G1 X45.651 Y48.42 Z-0.638 X45.251 Y49.224 Z-0.669 G2 X45.275 Y51.945 Z-0.768 I2.686 J1.336 G1 X47.877 Y56.947 Z-0.965 X47.758 Y57.059 Z-0.971 X42.699 Y54.542 Z-1.168 G2 X39.979 Y54.567 Z-1.266 I-1.336 J2.686 G1 X38.434 Y55.37 Z-1.327 X37.737 Y55.536 Z-1.352 G2 X35.58 Y57.52 Z-1.459 I0.693 J2.919 G1 X33.826 Y62.867 Z-1.656 X33.649 Y62.861 Z-1.662 X31.846 Y57.498 Z-1.859 G2 X29.865 Y55.581 Z-1.959 I-2.844 J0.956 G1 X28.186 Y55.077 Z-2.021 X27.614 Y54.724 Z-2.044 G2 X24.682 Y54.599 Z-2.151 I-1.577 J2.552 G1 X19.677 Y57.133 Z-2.347 X19.555 Y57.003 Z-2.353 X22.071 Y51.97 Z-2.55 G2 X22.112 Y49.371 Z-2.644 I-2.683 J-1.342 G1 X21.306 Y47.625 Z-2.711 X21.043 Y46.719 Z-2.744 G2 X19.054 Y44.693 Z-2.847 I-2.881 J0.838 G1 X13.763 Y43.044 Z-3.041 X13.767 Y42.901 Z-3.046 X19.128 Y41.079 Z-3.243 G2 X21.026 Y39.131 Z-3.342 I-0.966 J-2.84 G1 X21.524 Y37.533 Z-3.4 X21.884 Y36.993 Z-3.423 G2 X22.06 Y33.964 Z-3.534 I-2.496 J-1.664 G1 X19.489 Y28.93 Z-3.732 X19.624 Y28.805 Z-3.738 X23.806 Y30.851 Z-3.901 X26.159 Y35.208 Z-4.073 G2 X33.613 Y53.558 Z-4.957 I7.485 J7.648 X41.15 Y35.229 Z-5.842 I0.031 J-10.702 G1 X43.494 Y30.821 Z-6.016 X47.712 Y28.667 Z-6.181 X47.858 Y28.82 Z-6.189 X45.354 Y33.839 Z-6.385 G2 X45.355 Y36.52 Z-6.482 I2.684 J1.339 G1 X46.089 Y37.987 Z-6.539 X46.28 Y38.857 Z-6.57 G2 X48.31 Y41.073 Z-6.68 I2.93 J-0.646 G1 X53.639 Y42.749 Z-6.875 X53.63 Y42.956 Z-6.882 X48.266 Y44.735 Z-7.08 G2 X46.421 Y46.477 Z-7.171 I0.944 J2.848 G1 X45.651 Y48.42 Z-7.244 X45.251 Y49.224 Z-7.275 G2 X45.275 Y51.945 Z-7.374 I2.686 J1.336 G1 X47.877 Y56.947 Z-7.571 X47.758 Y57.059 Z-7.577 X42.699 Y54.542 Z-7.774 G2 X39.979 Y54.567 Z-7.873 I-1.336 J2.686 G1 X38.434 Y55.37 Z-7.933 X37.737 Y55.536 Z-7.958 G2 X35.58 Y57.52 Z-8.065 I0.693 J2.919 G1 X33.826 Y62.867 Z-8.262 X33.649 Y62.861 Z-8.268 X31.846 Y57.498 Z-8.466 G2 X31.386 Y56.632 Z-8.5 I-2.844 J0.956 X29.865 Y55.581 I-2.383 J1.822 G1 X28.186 Y55.077 X27.614 Y54.724 G2 X24.682 Y54.599 I-1.577 J2.552 G1 X19.677 Y57.133 X19.555 Y57.003 X22.071 Y51.97 G2 X22.112 Y49.371 I-2.683 J-1.342 G1 X21.306 Y47.625 X21.043 Y46.719 G2 X19.054 Y44.693 I-2.881 J0.838 G1 X13.763 Y43.044 X13.767 Y42.901 X19.128 Y41.079 G2 X21.026 Y39.131 I-0.966 J-2.84 G1 X21.524 Y37.533 X21.884 Y36.993 G2 X22.06 Y33.964 I-2.496 J-1.664 G1 X19.489 Y28.93 X19.624 Y28.805 X23.806 Y30.851 X26.159 Y35.208 G2 X33.613 Y53.558 I7.485 J7.648 X41.15 Y35.229 I0.031 J-10.702 G1 X43.494 Y30.821 X47.712 Y28.667 X47.858 Y28.82 X45.354 Y33.839 G2 X45.355 Y36.52 I2.684 J1.339 G1 X46.089 Y37.987 X46.28 Y38.857 G2 X48.31 Y41.073 I2.93 J-0.646 G1 X53.639 Y42.749 X53.63 Y42.956 X48.266 Y44.735 G2 X46.421 Y46.477 I0.944 J2.848 G1 X45.651 Y48.42 X45.251 Y49.224 G2 X45.275 Y51.945 I2.686 J1.336 G1 X47.877 Y56.947 X47.758 Y57.059 X42.699 Y54.542 G2 X39.979 Y54.567 I-1.336 J2.686 G1 X38.434 Y55.37 X37.737 Y55.536 G2 X35.58 Y57.52 I0.693 J2.919 G1 X33.826 Y62.867 X33.649 Y62.861 X31.846 Y57.498 G2 X31.386 Y56.632 I-2.844 J0.956 G3 X31.301 Y56.462 Z-8.462 I0.397 J-0.304 X31.284 Y56.302 Z-8.354 I0.482 J-0.133 X31.301 Y56.195 Z-8.191 I0.499 J0.027 X31.313 Y56.159 Z-8 I0.482 J0.134 G0 Z15 (Circular1) M9 X25.393 Y13.652 Z15 Z1 G1 Z-0.5 F960 G19 G2 Y13.152 Z-1 J-0.5 G1 Y12.902 G17 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There is nothing wrong with the code that I can see. It still depends on both G54 and G28 being set correctly. Note that when it starts the outline cut it expects to be outside the stock, which it appears to have been, ie off the edge on the near side. This is important because it rapids down to within the top of the stock. From the burning I'd say that the chips got caught in the bit and once it was full it started to produce a lot of friction. Reduce the depth of cut and/or number of teeth on the cutter. Those chips have to have somewhere to go and they MUST go there. You also do not want to re-cut any chips so make sure you blow them away or suck them up. From the wandering direction I'd say that the X axis lost steps due to the bit forcing itself to the left. Is it an upcut bit? How many teeth? How fast is it turning? Is the cutter designed for wood? It all makes a difference. (-:
Thanks for your insights. I guess I didn't set G54 and G28 correctly and I used too few passes. The bit was a 4 flute HSS end mill, 5mm diameter with a 6 mm shank. Not sure about upcut or if it's designed for wood because its a cheap aliexpress bit. The spindle speed was set to 6 on the Makita, which is 18000 or greater (if I recall correctly). I'm quite new to all this but I understand it's a poor choice of cutter.
In wood and aluminum you want fewer flutes to give the chips space to escape. Especially for small diameter cutters (less than .5 inch) Google for how to calculate feed rate (also look in the Resources section on this site), each flute can be cutting about 3 to 5 thou per rev (in wood). Too little and it makes powder instead of chips. Too much and it will get stuck. Always try to use the correct calculated feed speed, then adjust depth of cut to keep your machine happy. A great big industrial machine might be able to cut 2 inches deep, but the feed speed and RPM are still calculated. A light DIY machine made from scraps and drawer slides might only be able to cut 1/16" deep, the feedrate will not change that much at all so better to use the correct rate and experimentally increase the depth of cut until the machine is unhappy, then back off about 20%. Yes, there is such a thing as feeding too slowly so 'babying' the rate of cut is not useful.
Another solution is to use a different post processor, like this one designed for GRBL GitHub - Strooom/GRBL-Post-Processor: Start It does not use the G28 code at all, instead using G53 which means that home must be set correctly
You were right about my bit, speeds and feeds. I setup just like in my post (G-Code Help) and cut a 1.5x scaled version of Kyo's keyring. Thanks again.