Using G55

Carl Harrison

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Nov 6, 2019, 6:21:25 AM11/6/19

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Hi

Can anyne tell me if (and then how) I can use G55 in Camitics?

Carl Harrison

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Nov 6, 2019, 6:25:26 AM11/6/19

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If it makes any difference I am using GCode files on Windows10

Joseph Coffland

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Nov 6, 2019, 4:16:19 PM11/6/19

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G55 selects coordinate system 2. It's use is described in detail on the LinuxCNC website: http://linuxcnc.org/docs/html/gcode/coordinates.html

Carl Harrison

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Nov 6, 2019, 4:54:38 PM11/6/19

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Thanks, I didn't know about the G10 command

Joseph Coffland

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Nov 6, 2019, 5:04:54 PM11/6/19

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There is a quirk to how CAMotics handles coordinate offsets. It stores the negative of the offset. This has been corrected in the next release. It shouldn't make a difference in your GCode unless you try to use the numerical parameter references. E.g. #5241.

Carl Harrison

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Nov 6, 2019, 6:11:56 PM11/6/19

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Thanks I am well sorted now I just added

G10 L2 P2 X50 y50 Z20

to my gcode to test it.

I am cutting polycarbonate and my minimun spindle speeed is 7600RPM and am finding the material melts, sticks to the tools and rubs against the material marking it. So I have written a simple program to add a G55 every 700 lines of gcode that will dip the tool in an oil bath to cool it. The G55 zero will be over the oil bath, will give it a try tomorrow.

Joseph Coffland

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Nov 6, 2019, 6:41:49 PM11/6/19

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Interesting idea. Have you tried increasing the feed rate? How about pointing a fan at the bit?

Carl Harrison

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Nov 6, 2019, 7:00:08 PM11/6/19

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I have now set up a compressed airline to the tool. Speeding up the the feedrate is an option but having tried it it leaves lots of burrs which I wouild like to reduce although if needs must I can live with them. Test cuttin 4 components was fine but on a production run cutting 80 components out of an A4 sheet I encountered the problem of the material welding to the tools. Half of the program is engraving text 0.2mm deep in the parts (this is where the welding happened) the second half of the program is to cut out the parts. The material is 3mm thick polycarbonate sheet so if I have issues just cutting 0.2mm text I figure cutting through it may be a bigger issue though I do know when I cut deeper there is far better chip removal, so it's a case of suck it and see.

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