dxf2gcode / lathe; why is x doubled?

[mr]

Hi,

in postpro/postprocessor.py

def make_print_str(self, keystr):

"""

This is the main function which converts the Keyvalues given in the

Postprocessor Configuration into the values.

@param keystr: String in which all keywords are to be

replaced by the variables etc.

@return: Returns the string with replaced keyvars (e.g. %Z is replaced

by the real Z value in the defined Number Format.

"""

if g.config.machine_type=='lathe':

fac = 2

else:

fac = 1

there's this code in dxf2gcode, why is the multiplier 2 for the lathe?

Is anyone really using it like that and could explain why it's done that way?

the way I use linuxcnc I don't really need it, but maybe there's some idea behind that. 

Br,

Markus

[Markus Rechberger]

I'm answering it myself.

Since annotation didn't work in the sourceforge interface (or that
feature is not there at all)
2278e563 ( neveruml 2015-10-28 03:15:53 +0100 643)
if g.config.machine_type=='lathe':
00000000 (Not Committed Yet 2021-05-23 14:06:14 -0400
644) fac = 1
551acadc (Christian Kohl<C3><B6>ffel 2014-11-23 22:21:07
+0000 645) else:
551acadc (Christian Kohl<C3><B6>ffel 2014-11-23 22:21:07
+0000 646) fac = 1

----

commit 551acadcb892398b9123e07442d21dcfd802251c
Author: Christian Kohl<C3><B6>ffel <christian-...@t-online.de>
Date: Sun Nov 23 22:21:07 2014 +0000

Changes according to:
https://groups.google.com/forum/#!topic/dxf2gcode-users/LpHqC8Jf0mE
----

> There are two additional details that I would like to massage in the code. The most important one is that my lathe control (1980 Fanuc 5T)
> expects to see all X axis moves described as Diameter moves

I usually use linuxcnc in radius mode, not in diameter mode that's why
I was confused about that feature.

So everything's ok.

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[Christian Kohlöffel]

Hi Markus, I am not aware of really someone is using it. But I guess it's the calculation from Radius to Diameter. Some machines may need the Diameter on the Y axis what I still think to remember. Maybe an option in the postprocessor would be adequate to handle this.

Regards Christian

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[Markus Rechberger]

Hi,

linuxcnc by default is in radius mode.
G7 ... Lathe Diameter Mode
G8 ... Lathe Radius Mode
it's no problem it just has to be known...

Best Regards,
Markus

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