G02 / G03 Strange arcs

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19 Feb 2015 00:41 - 19 Feb 2015 00:43 #56082 by Robban
Hi.
Trying to get some code produced with Dolphin Partmaster to work but getting strange arcs with g02 g03 codes.
Dolphin helped me to modify my post but got even stranger output.
Is there a setting i might have missed?


Test with unmodified post.


Test with modified post.

File Attachment:

File Name: pipganga03.ngc
File Size:4 KB

The gcode
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Last edit: 19 Feb 2015 00:43 by Robban.

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19 Feb 2015 00:50 #56084 by piasdom
Replied by piasdom on topic G02 / G03 Strange arcs
try changing/using increment and absolute(either one or other)
they effect g02 and g03

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19 Feb 2015 01:10 #56086 by Robban
Replied by Robban on topic G02 / G03 Strange arcs
Tried to put G90.1 and G91.1 in front of the G02 code but that didnt work either.

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19 Feb 2015 01:15 #56087 by piasdom
Replied by piasdom on topic G02 / G03 Strange arcs
change it in the post

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19 Feb 2015 02:30 #56090 by andypugh
Replied by andypugh on topic G02 / G03 Strange arcs

Hi.
Trying to get some code produced with Dolphin Partmaster to work but getting strange arcs with g02 g03 codes.
Dolphin helped me to modify my post but got even stranger output.


The problem in the first picture is that it is using G2 when it should be G3 and vice-versa. If you were to do a search/replace on the first image (G2 -> WWW , G3->G2, WWW->G3 ) then I think it would look right.

The clockwise/anticlockwise directions are as-viewed from underneath the lathe for a front-toolpost lathe. It may be that the CAM expects a back-toolpost lathe, and there might even be a setting for it. (Or, in fact, it might not matter, I can't decide)

I don't know what happened in the second post. It looks like the arcs have been cut into sections, but strangely.

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19 Feb 2015 02:53 #56094 by Robban
Replied by Robban on topic G02 / G03 Strange arcs

I don't know what happened in the second post. It looks like the arcs have been cut into sections, but strangely.

Thats what happend if you switched the G2 G3 codes

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19 Feb 2015 03:04 #56096 by Robban
Replied by Robban on topic G02 / G03 Strange arcs
Got the right arcs if i switched g2 g3 and set the post processor to use the rear turret so its obviosly a postprocessor error.

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