Tool diameter compensation/offset ?

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25 May 2013 00:17 - 25 May 2013 05:21 #34648 by grey1beard
Having just broken my only 3mm diameter mill on a Friday evening before a holiday weekend, my only solution is to use a 6mm to cut round the outside of 10 hardboard hexagons I'm making for my weekend project.
I've written the code for the hexagon, and don't really want to run through the calculations again to position the 6mm cutter further out.

EDIT
Done the maths, as no help appeared, but I'd still be keen to learn, as the pentagons were a bit of a pain.
Truncated icosahedron in the making


I know there is a method of offsetting the tool by its radius, using G41 (?) so this is what I want to add to my code.
On my diy machine I have not set up any tool table in the config, which is where I assume I need to do this.
Is this correct ?

Grateful for any help, spelt out for an old newbie, who's still got EMC2.3.5 on ubuntu 8.04 !

John
Last edit: 25 May 2013 05:21 by grey1beard.

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25 May 2013 14:59 - 25 May 2013 15:02 #34670 by Rick G
If you write your code with no offsets in the future, set up a tool table you could use G41 or G42 for the offsets.
linuxcnc.org/docs/html/gcode/tool_compen...:cutter-compensation

Rick G
Last edit: 25 May 2013 15:02 by Rick G.
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25 May 2013 15:09 #34671 by grey1beard
Thanks for the link, Rick. exactly what I need to learn, and more besides ;)

Regards
John

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25 May 2013 19:19 #34676 by BigJohnT
There is a bit more info in my G code tutorial...

www.gnipsel.com/linuxcnc/g-code/mill04.html

JT
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26 May 2013 05:00 #34701 by grey1beard
Thanks John.
On a more general note, do I need to upgrade my 2.3.5 version to make use of G41.1 code ?

John

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27 May 2013 20:07 #34753 by BigJohnT
I'm not sure when G41.1 was added, if it doesn't give you an unknown G code error I assume your good to go.

JT
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28 May 2013 03:49 #34791 by grey1beard
Thanks John.
When I manage to get back into the workshop, and out of 'labouring duties' in the garden, I'll give it a try. ;)
John

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