Curve fitting

[marker4x4]

Hi everyone,

I'm wondering how many of you use the Curve Fitting option in Gpost , to what extent and with what results.
Does any particular NC Sequence (Profile, Surface, etc.) works better / worse with that option? What chordal tolerance do you usually use?

Thanks!!

 

[marker4x4]

No-one???

Edited by: marker4x4

 

[pronc]

I tried that about 3 years ago when we first got a machine with nurbs interpolation. There was some gouging. Ptc support told me there is an issue. Here is the resolution.

"SPR number 1109931 was filed to address this issue. This has been fixed
in GPOST version 6.0 and later. This is shipped with Pro/ENGINEER
Wildfire 2.0 M200 and later."

I never get a chance to go back and try it again. Please let me know if you have any problem.

 

[marker4x4]

I tried that about 3 years ago when we first got a machine with nurbs interpolation. There was some gouging. Ptc support told me there is an issue. Here is the resolution.

"SPR number 1109931 was filed to address this issue. This has been fixed
in GPOST version 6.0 and later. This is shipped with Pro/ENGINEER
Wildfire 2.0 M200 and later."

I never get a chance to go back and try it again. Please let me know if you have any problem.

The last time I tried was on ProE 2001.... didn't work very well (no NURBS, just arc fitting), we've had some gouging issues as well so we dropped it altogether for the time being.
Now that we're on WF3, the idea came back. We did some simple arc fitting tests with 0.0001" discretization and (knock the wood) so far so good, but we need to do more trials. I'll keep you posted.

Anyone else?

 

[pronc]

Thank you for the info. I guess I have to get back on this since most of our machines have nurbs machining capability.

 

[dibz]

Hi
i use arc fitting regularly.. its speeds up and smoothens the tool path..tolerance i giv 5 microns..

and never use arc fit post processor for a surface milling sequence as it reduces arc points and giv faulty finish
Edited by: dibz

 

[marker4x4]

Hi
i use arc fitting regularly.. its speeds up and smoothens the tool path..tolerance i giv 5 microns..

and never use arc fit post processor for a surface milling sequence as it reduces arc points and giv faulty finish

I'm not too sure if I follow... so if Surface Seq. doesn't work for you, then which Sequences are you happy with?


Thanks,

 

[dibz]

Hi
surface milling and 3axis trajectry milling has all x,y,z coordinates in the same block.. so if u use the arc fit post.. some of ur z coordinates gets removed.

but all other 2 1/2 sequences work fine.

 

[leow_john]

hi Dibu.

.....but all other 2 1/2 sequences work fine....

Then which sequence you mean..?

Regards

Leow