Strange behaviour M61 Qn and cuttercompensation

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04 Oct 2019 11:15 #147109 by MaHa
Because i need to do manualtoolchange sometimes at other position than at defined toolchange position, i use M61 Qn instead of M6. Works fine, mostly. Only this situation example:
Having a flute mill dia=12mm in spindle, next tool is dia=2mm, and cutter compensation will be applied. When reload file and M61 Qn is used for toolchange, it occurs an error in connection with G41/G42. Cuttercompensation does incorrectly recognise current tool in spindle, instead of changed tool. Is there a way to make M6 toolchange position variable, setable from Gcode, or get rid off this behaviour of M61 Qn / G41 G42?

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04 Oct 2019 15:06 - 04 Oct 2019 15:09 #147117 by BigJohnT
You may want to read the M6 section of the documents for important information about what it does and does not do. While not stated in the documents I assume M61 works just like M6 with the exception of not moving anything.

JT
Last edit: 04 Oct 2019 15:09 by BigJohnT.

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05 Oct 2019 05:24 #147156 by andypugh
Yes. I think that the point here is that both M6 and M61 require a G43 to apply the tool offsets and diameter.

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05 Oct 2019 10:19 #147181 by MaHa
I use tooltable, and G43 is always applied. I made a short .ngc file to demonstrate, only need to load and reload. Tools T12 D=12 and T2 D=2 needed in tooltable.
Comment/uncomment in line 30/31. Open file or Ctrl-R produces the error, when M61 Q2 used.
Attachments:

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08 Oct 2019 06:00 - 08 Oct 2019 06:01 #147429 by andypugh
i wish there was a way to mark forum posts as "unread" or (better) for follow up.

Now I have read this, I can't unread it, but don't want to forget that I intend to look at it.

If nobody gets back to this within a few days please reply just to bump it back up the list, I think this sounds like it needs looking at.
Last edit: 08 Oct 2019 06:01 by andypugh.

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