I biult an JDs garage CNC plasma table.I have it working and am trying to cut some dog shapes out of .0125" some setting in Setup or Post or Possibly Tool setup.When i open in OpenBiulds The paths have Mostly blue lines with sections of red in curves.When the torch slows it goes off. I am useing Fusion and OpenBiulds Post.No ARCS
Extinguishing arc is usually related to - air pressure too high - worn consumables - cut height too high - wrong consumables (using drag cutting with a clear cut nozzle or cutting high with a drag nozzle)
The torch goes out because it's 1/8 and when it slows it runs out of metal and goes off. It has been cutting fine with square and circles . I was cutting 3/16 and when it slowed in the curves it was not a problem but when I dropped to 1/8 the torch would go off in the curves. I un checked the ARCS box and it cut fine. Now with these new shapes I am having problems. What can I do to help you All to help Me?
The G-Coad has these sections of short jogs what did i do wrong? (Made in : Autodesk CAM Post Processor) (G-Code optimized for Grbl 1.1 / BlackBox controller) (OpenBuilds CNC : GRBL/BlackBox) (Post-Processor : OpenbuildsFusion360PostGrbl.cps V1.0.42) (Units = mm) (Laser UseZ = false) (Laser UsePierce = false) (Arcs are limited to the XY plane: if you want vertical arcs then) (edit allowedCircularPlanes in the CPS file) (Drawing name : Meerkat4 v2) (Program Name : Meerkat 4) (1 Operation (1 : 2D Profile1) ( Work Coordinate System : G54) ( Tool 2: Plasma Cutter Diam = 25.4mm) ( Machining time : 0h:0m:50s) G90 G94 G17 G21 (Plasma pierce height 4) (Plasma topHeight 3) (Operation 1 of 1 : 2D Profile1) G54 (Plasma cutting with GRBL.) (Using torch height probe and pierce delay.) (This relies on homing, see Search Results for Query: G53 fusion | OpenBuilds ) G53 G0 Z10 G0 X80.776 Y45.363 F1000 G0 X80.776 Y45.363 Z45 G38.2 Z-30 F100 G10 L20 Z-2.5 G0 X80.776 Y45.363 ; force position after probe Z4 M3 S1000 G4 P1.8 G1 Z3 F1000 G1 X77.039 Y46.788 G3 X76.495 Y43.803 I6.29 J-2.688 X77.325 Y41.016 I7.795 J0.803 X79.579 Y37.323 I22.814 J11.393 X81.379 Y34.909 I21.947 J14.492 X82.984 Y33.638 I4.113 J3.544 X85.199 Y33.306 I1.708 J3.848 G2 X86.648 Y33.201 I0.354 J-5.145 G1 X86.74 Y33.179 G2 X89.191 Y31.987 I-1.777 J-6.772 X91.156 Y30.487 I-23.21 J-32.443 X92.451 Y29.477 I-4.636 J-7.284 X92.763 Y29.105 I-3.013 J-2.84 G1 X92.818 Y29.027 X92.925 Y28.86 X92.979 Y28.766 X93.067 Y28.589 X93.114 Y28.477 X93.18 Y28.29 X93.2 Y28.228 X93.215 Y28.165 X93.258 Y27.966 X93.269 Y27.9 X93.277 Y27.832 X93.292 Y27.622 X93.295 Y27.555 X93.293 Y27.488 X93.28 Y27.266 X93.274 Y27.202 X93.264 Y27.139 X93.219 Y26.903 X93.191 Y26.79 X93.112 Y26.54 X93.076 Y26.442 G2 X92.006 Y24.458 I-9.514 J3.85 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Y1.727 X65.116 Y1.536 X65.052 Y1.473 G2 X62.489 Y0.203 I-3.515 J3.87 X59.77 Y0.087 I-1.642 J6.568 G1 X59.665 Y0.123 X59.557 Y0.158 X59.476 Y0.189 X59.385 Y0.229 X59.299 Y0.278 X59.245 Y0.312 X59.19 Y0.35 X59.137 Y0.392 G3 X56.52 Y1.872 I-5.104 J-5.97 X54.096 Y2.718 I-17.652 J-46.688 G2 X51.172 Y4.005 I4.726 J14.707 X47.801 Y8.477 I3.777 J6.353 G3 X46.621 Y11.948 I-154.748 J-50.672 G2 X46.032 Y14.974 I12.627 J4.027 X46.063 Y16.521 I15.078 J0.478 G3 X45.855 Y19.948 I-24.896 J0.21 G2 X45.496 Y23.585 I62.621 J8.009 G3 X44.938 Y28.793 I-29.238 J-0.501 X43.316 Y33.231 I-15.986 J-3.328 X38.285 Y38.061 I-10.566 J-5.969 X32.68 Y39.922 I-8.743 J-16.958 G2 X28.951 Y40.876 I3.928 J23.125 X23.826 Y43.292 I10.853 J29.67 X18.117 Y46.855 I54.009 J92.874 X15.298 Y48.641 I52.57 J86.107 X8.7 Y56.23 I11.895 J17.005 X6.531 Y61.676 I24.453 J12.892 G1 X5.406 Y65.653 X4.271 Y69.627 G3 X1.267 Y77.941 I-73.973 J-22.024 X0.101 Y80.441 I-67.073 J-29.773 G2 X1.297 Y81.833 I0.899 J0.437 X6.163 Y79.597 I-4.746 J-16.742 X10.339 Y74.59 I-7.184 J-10.237 X13.703 Y66.587 I-109.08 J-50.558 X14.836 Y63.168 I-105.849 J-36.97 G3 X20.957 Y54.87 I16.386 J5.68 X26.408 Y51.745 I16.331 J22.167 X30.991 Y49.905 I24.361 J54.061 G1 X34.149 Y48.776 G3 X36.279 Y48.452 I1.78 J4.542 X37.005 Y48.74 I-0.265 J1.728 X37.592 Y49.851 I-1.042 J1.26 X37.536 Y51.791 I-5.177 J0.822 G2 X36.438 Y68.878 I82.332 J13.867 X37.621 Y82.333 I124.673 J-4.177 X39.201 Y92.338 I227.567 J-30.812 G1 X39.795 Y95.656 X40.406 Y98.976 X41.623 Y105.605 X42.818 Y112.377 X43.982 Y119.158 X46.285 Y132.729 X47.454 Y139.51 G2 X51.696 Y162.127 I766.561 J-132.036 X56.728 Y182.633 I388.324 J-84.426 G1 X58.628 Y189.714 X60.521 Y196.798 G3 X61.325 Y203.866 I-25.284 J6.457 X61.045 Y206.781 I-43.079 J-2.671 G2 X60.867 Y212.796 I37.869 J4.129 X61.634 Y216.861 I17.443 J-1.185 X66.267 Y222.676 I10.239 J-3.406 X70.191 Y224.527 I9.372 J-14.783 X75.268 Y225.883 I11.852 J-34.179 X85.791 Y227.291 I14.105 J-65.383 X93.439 Y226.891 I1.697 J-40.84 X105.818 Y222.063 I-4.647 J-30.2 G3 X109.979 Y220.9 I4.579 J8.351 X113.25 Y220.922 I1.517 J16.992 G2 X115.762 Y220.835 I0.94 J-9.132 X117.121 Y220.242 I-0.984 J-4.11 G1 X117.188 Y220.188 G2 X118.477 Y218.353 I-2.291 J-2.979 X118.511 Y213.782 I-6.293 J-2.333 X116.592 Y210.512 I-8.569 J2.831 G1 X113.068 Y206.463 X109.533 Y202.422 X105.988 Y198.39 G2 X98.958 Y190.927 I-162.577 J146.08 G3 X95.902 Y186.518 I11.591 J-11.301 X95.046 Y179.923 I10.954 J-4.775 X95.583 Y177.407 I15.796 J2.058 G2 X96.916 Y172.792 I-121.68 J-37.645 X97.499 Y168.52 I-17.504 J-4.566 G3 X97.469 Y163.226 I43.156 J-2.892 X102.15 Y148.196 I33.352 J2.143 X107.061 Y141.457 I37.142 J21.906 G2 X113.695 Y132.16 I-42.384 J-37.258 X117.91 Y121.496 I-37.608 J-21.031 X118.623 Y117.751 I-50.32 J-11.527 G3 X119.996 Y114.227 I12.766 J2.942 G1 X120.416 Y113.44 G2 X122.405 Y109.762 I-49.686 J-29.254 X123.555 Y105.95 I-11.969 J-5.688 X123.455 Y102.744 I-12.409 J-1.217 G1 X122.938 Y98.811 G2 X121.034 Y98.524 I-0.992 J0.123 G3 X118.764 Y102.372 I-15.289 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Make sure that it is set to 'disabled' (and don't forget to save the change). If it was 'enabled' it could cause the torch to switch off at slow speeds (depending on how you're controlling the torch).
for plasma, laser mode must be disabled then in Fusion360 you need to enable smoothing and set the value to a useful amount, try kerf width as a starting point. In short, the torch is slowing in curves because Fusion360 is generating thousands of short Gcode moves, and it takes time to process those thousands of lines of tiny moves. Smoothing reduces the line count, the lines don't need to be shorter than the kerf width, so you can fiddle with settings till you get lines of about that length. How long is a move? Gcode moves from the postion of the previous move, to the position of this move G20 ; inches G1 X-5.5691 Y0.4451 ; from here G1 X-5.5669 Y0.4900 ; to here The length of the move is sqrt( (x1-x2)^2 + (y1-y2)^2) sqrt ( (-5.5691- -5.5669)^2 + (0.4451-0.49)^2) sqrt ( 0.0022^2 + 0.0449^2) signs don't matter since we are squaring so I have left them out sqrt ( 0.00000484 + 0.002) sqrt(0.00202) = 0.04495" so, about 1.1mm in this case the controller has to do that calculation (and more) for every line it gets, while simultanously driving the motors and checking for errors etc. a long sequence of 0.04" moves is usually ok, a long sequence of 0.004 moves will slow it down and that is not ok.
