Laser on during initial move

myjunkmail2209 — Sun, 21 Mar 2021 11:12:53 GMT

I decided to try Fusion for some laser etching/cutting, and I've noticed something odd and annoying.

The laser is on for the initial move from the WCS origin to the starting location.

Is this an issue with Fusion, my post-processor or user error?

Output from post-processor:

;*********************************************************************************** ;HyperCube CAM post processor for Fusion360: Version 1.0 ;Compatible with Marlin 1.1.4+ ;By Tech2C ;https://www.thingiverse.com/thing:1752766 ;https://www.youtube.com/watch?v=n2jM6v3E7sU... ;*********************************************************************************** M117 Starting... M5 ;Laser/Fan OFF G21 ;Metric Values G17 ;Plane XY G90 ;Absolute Positioning G92 X0 Y0 Z0 ;Set XYZ Positions G0 F2500 G0 Z0 F300 ;Position Z M400 M117 Outside M3 S192 G1 X-9 Y-211.36 Z0 G1 X-8 G1 Y0 G1 X8 G1 Y-211.36 G1 X-8 G1 X-9 M400 M5 ;Laser/Fan OFF G0 F2500 M84 ;Motors OFF M117 Finished

Re: Laser on during initial move

myjunkmail2209 — Sun, 21 Mar 2021 14:12:26 GMT

I think it is the post processor that is causing the issue.

Could someone please look over the following to see if the problem is evident.

/** HyperCube CAM post processor for Fusion360 Compatible with Marlin 1.1.4+ By Tech2C https://www.thingiverse.com/thing:1752766 https://www.youtube.com/watch?v=n2jM6v3E7sU&list=PLIaArjwViQRVAERWRrYfe9rtiwvvRGCzw Changed to M3 Sxxx - Laser on @ power Sxxx Changed to M5 - Laser OFF Adapted from 'Generic Grbl' (grbl.cps) and 'Dumper' (dump.cps) */ description = "HyperCube for Fusion360"; vendor = "Marlin"; vendorUrl = "https://github.com/MarlinFirmware/Marlin"; extension = "nc"; setCodePage("ascii"); capabilities = CAPABILITY_INTERMEDIATE; tolerance = spatial(0.002, MM); minimumChordLength = spatial(0.01, MM); minimumCircularRadius = spatial(0.01, MM); maximumCircularRadius = spatial(1000, MM); minimumCircularSweep = toRad(0.01); maximumCircularSweep = toRad(180); allowHelicalMoves = true; allowedCircularPlanes = undefined; // allow any circular motion // user-defined properties properties = { startHomeX: false, startHomeY: false, startHomeZ: false, startPositionZ: "2", finishHomeX: false, finishPositionY: "", finishPositionZ: "", finishBeep: false, rapidTravelXY: 2500, rapidTravelZ: 300, laserEtch: "M3 S128", laserVaperize: "M3 S255", laserThrough: "M3 S192", laserOFF: "M5" }; var xyzFormat = createFormat({decimals:3}); var feedFormat = createFormat({decimals:0}); var xOutput = createVariable({prefix:"X"}, xyzFormat); var yOutput = createVariable({prefix:"Y"}, xyzFormat); var zOutput = createVariable({prefix:"Z"}, xyzFormat); var feedOutput = createVariable({prefix:"F"}, feedFormat); var planeOutput = createVariable({prefix:"G"}, feedFormat); // circular output var iOutput = createReferenceVariable({prefix:"I"}, xyzFormat); var jOutput = createReferenceVariable({prefix:"J"}, xyzFormat); var kOutput = createReferenceVariable({prefix:"K"}, xyzFormat); var cuttingMode; function formatComment(text) { return String(text).replace(/[\(\)]/g, ""); } function writeComment(text) { writeWords(formatComment(text)); } function onOpen() { writeln(";***********************************************************************************"); writeln(";HyperCube CAM post processor for Fusion360: Version 1.0"); writeln(";Compatible with Marlin 1.1.4+"); writeln(";By Tech2C"); writeln(";https://www.thingiverse.com/thing:1752766"); writeln(";https://www.youtube.com/watch?v=n2jM6v3E7sU&list=PLIaArjwViQRVAERWRrYfe9rtiwvvRGCzw"); writeln(";***********************************************************************************"); } /** Force output of X, Y, and Z. */ function forceXYZ() { xOutput.reset(); yOutput.reset(); zOutput.reset(); } /** Force output of X, Y, Z, and F on next output. */ function forceAny() { forceXYZ(); feedOutput.reset(); } function onSection() { if(isFirstSection()) { writeln(""); writeWords("M117 Starting..."); writeWords(properties.laserOFF, " ;Laser/Fan OFF"); writeWords("G21", " ;Metric Values"); writeWords(planeOutput.format(17), " ;Plane XY"); writeWords("G90", " ;Absolute Positioning"); writeWords("G92 X0 Y0 Z0", " ;Set XYZ Positions"); writeWords("G0", feedOutput.format(properties.rapidTravelXY)); if(properties.startHomeX) { writeWords("G28 X", " ;Home X"); } if(properties.startHomeY) { writeWords("G28 Y", " ;Home Y"); } if(properties.startHomeZ) { writeWords("G28 Z", feedOutput.format(properties.rapidTravelZ), " ;Home Z"); } if(properties.startPositionZ) { writeWords("G0 Z" + properties.startPositionZ, feedOutput.format(properties.rapidTravelZ), " ;Position Z"); } } if (currentSection.getType() == TYPE_JET) { if(currentSection.jetMode == 0) {cuttingMode = properties.laserThrough } else if(currentSection.jetMode == 1) {cuttingMode = properties.laserEtch } else if(currentSection.jetMode == 2) {cuttingMode = properties.laserVaperize } else {cuttingMode = (properties.laserOFF + " ;Unknown Laser Cutting Mode") } } if (hasParameter("operation-comment")) { var comment = getParameter("operation-comment"); if (comment) { writeln(""); writeWords("M400"); writeComment("M117 " + comment); } } } function onDwell(seconds) { if (seconds > 99999.999) { warning(localize("Dwelling time is out of range.")); } seconds = clamp(0.001, seconds, 99999.999); writeWords("G4 S" + seconds, " ;Dwell time"); } function onPower(power) { if (power) { writeWords(cuttingMode) } else { writeWords(properties.laserOFF) } } function onRapid(_x, _y, _z) { var x = xOutput.format(_x); var y = yOutput.format(_y); var z = zOutput.format(_z); if (x || y) { writeWords("G0", x, y, feedOutput.format(properties.rapidTravelXY)); } if (z) { writeWords("G0", z, feedOutput.format(properties.rapidTravelZ)); } } function onLinear(_x, _y, _z, _feed) { var x = xOutput.format(_x); var y = yOutput.format(_y); var z = zOutput.format(_z); var f = feedOutput.format(_feed); if(x || y || z) { writeWords("G1", x, y, z, f); } else if (f) { writeWords("G1", f); } } function onCircular(clockwise, cx, cy, cz, x, y, z, feed) { // one of X/Y and I/J are required and likewise var start = getCurrentPosition(); switch (getCircularPlane()) { case PLANE_XY: writeWords(planeOutput.format(17), (clockwise ? "G2":"G3"), xOutput.format(x), yOutput.format(y), zOutput.format(z), iOutput.format(cx - start.x, 0), jOutput.format(cy - start.y, 0), feedOutput.format(feed)); break; case PLANE_ZX: writeWords(planeOutput.format(18), (clockwise ? "G2":"G3"), xOutput.format(x), yOutput.format(y), zOutput.format(z), iOutput.format(cx - start.x, 0), kOutput.format(cz - start.z, 0), feedOutput.format(feed)); break; case PLANE_YZ: writeWords(planeOutput.format(19), (clockwise ? "G2":"G3"), xOutput.format(x), yOutput.format(y), zOutput.format(z), jOutput.format(cy - start.y, 0), kOutput.format(cz - start.z, 0), feedOutput.format(feed)); break; default: linearize(tolerance); } } function onSectionEnd() { writeWords(planeOutput.format(17)); forceAny(); } function onClose() { writeln(""); writeWords("M400"); writeWords(properties.laserOFF, " ;Laser/Fan OFF"); if(properties.finishPositionZ) { writeWords("G0 Z" + properties.finishPositionZ, feedOutput.format(properties.rapidTravelZ), " ;Position Z"); } writeWords("G0", feedOutput.format(properties.rapidTravelXY)); if(properties.finishHomeX) { writeWords("G28 X", " ;Home X"); } if(properties.finishPositionY) { writeWords("G0 Y" + properties.finishPositionY, " ;Position Y"); } writeWords("M84", " ;Motors OFF"); if(properties.finishBeep) { writeWords("M300 S800 P300"); } writeWords("M117 Finished :)"); }

Re: Laser on during initial move

carl.j.barker — Sun, 21 Mar 2021 17:26:30 GMT

Just looking at the code, I'd say that this line

G1 X-9 Y-211.36 Z0

Should be a G0. or otherwise be done before the laser is turned on.

Can you show fusions output for this - right click the toolpath in the browser and choose 'view toolpath'

so we can see what fusion is sending to the PP.

Re: Laser on during initial move

myjunkmail2209 — Sun, 21 Mar 2021 18:13:53 GMT

Re: Laser on during initial move

carl.j.barker — Sun, 21 Mar 2021 19:41:13 GMT

Well the post is outputting correctly as far as I can tell.

Your tool path is missing the initial rapids to start point (or what ever the personal version outputs, Guessing just a linear ).

Can you share the design with the setup and toolpathing on it?

Re: Laser on during initial move

myjunkmail2209 — Sun, 21 Mar 2021 20:18:13 GMT

https://a360.co/3f2hWrZ

Re: Laser on during initial move

myjunkmail2209 — Sun, 21 Mar 2021 20:42:25 GMT

I've also noticed that when I stack duplicate operations, the laser is not turned off at the end, before moving back to the initial starting position to go around again - Just ruined a nice bit of leather 😞

Re: Laser on during initial move

myjunkmail2209 — Mon, 22 Mar 2021 23:05:36 GMT

Thanks for your assistance Carl.

I've discovered that the power on at the start seems to be an aberration as I cannot replicate the fault in a new design.

The power remaining on between sections was a flaw in the post processor that I'm using.

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