solved Some problem when Post about G2/G3 with R

[w59001]

Hi, I am Jerry from Taiwan. Thanks for this software,I use it in school and introduction about CNC machine.

I have some problem when Post about G2/G3 with R
It is ok when post circle using IJ
but some error in R , if the central angle > 180 degree

 

[w59001]

here is the post file and dxf file.

 

[spicer]

Use this postprocessor:

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[spicer]

Has that solved your problem?

 

[w59001]

Dear spicer:

It's amazing that reply so fast.

I am sorry for my poor English. I has not given the question a very detailed description of the postprocessor.

My question is I need a minus sign(-) before R if the central angle > 180 degree.

mypost about G2

arc_int_cw = G2 X%XE Y%YE R%R%nl

the nc code like this

G2 X19.05 Y12.89 R2.24

but i need this if angle of the arc is big then 180 degree

G2 X19.05 Y12.89 R-2.24

I am not familiar with Python but in C

I guess the program like this

if abs(s_ang - e_ang) > pi:
R=0-R

in somewhere(maybe dxf2gcode/core/arcgeo.py or /dxf2gcode/postpro/postprocessor.py)

 

[spicer]

Hmm, it's a question for @chrisko
Sorry

 

[chrisko]

Sorry, did see the question very late.
You may add this to your code somewhere here:

dxf2gcode / SourceCode / [ab2aa4] /source/dxf2gcode/core/arcgeo.py

sourceforge.net

or here:

dxf2gcode / SourceCode / [ab2aa4] /source/dxf2gcode/postpro/postprocessor.py

sourceforge.net

Please try and give feedback.

 

[w59001]

Thank you, Chrisko.
I download the file from sourceforge , both (or just one )arcgeo.py and postprocessor.py and rename the old python file to *.old then try again, but it still not work



here is test post file and dxf file.

 

[chrisko]

Hi, maybe i was not totaly clear here. I did point to the aereas in the code where YOU could add the requested change. Your code looks fine i guess.

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As your change is very specific i won't implement it in the code but feel free to add the line at one on the proposed places. That should solve you issue.

 

[w59001]

As your change is very specific

Sorry,I don't think that. We have three major type controllers in CNC mill machine in our school (Sinumerik 840,Fanuc 0i-md,Mitsubishi M70).They all supprot the "-R" funtion. It is almost a industry standards.
Here is the Programming Manual of Sinumerik on page 22.

 

[w59001]

I try to add the code in arcgeo.py near program bottom

if abs(s_ang - e_ang) > pi:
r=-r



but it not work properly,

for example a arc ,look from center o in the third quadrant.

s_ang=-3 e_ang=-1.8 the abs(s_ang - e_ang)=abs(-3 - (-1.8))= abs(-1.2) = 1.2 < pi , so it not work, but the arc > 180 degree

I guess s_ang and e_ang between -pi and pi for the arc. I need more time to understand fuction about dif_ang(),norm_angle(),atan2()....

 

[w59001]

I spend a lot of time to learn python and review mathematic texbook.
Then I add two lines in the program (arcgreo.py) and it seem work fine.

if abs(self.ext) > pi:
r = -r

Thank you, Chrisko.

 

[w59001]

By the way,
I finish about 70% translations from english to Traditional Chinese.
Can I provide dxf2gcode_zh_tw.ts and dxf2gcode_zh_tw.qm to add in the dxf2gcode project.