Need Help!- Crop circles - tiny arc turns into full circle

[Fadal Error]

How does this

turn into this?


Bobcad V23 2-axis pocketing. Offset pocket in (os pocket out does the same).

~1996 Fadal 4020 88h Format 1

What it looks like is that Bobcad generates and arc that is miniscule (.0001-.0003 or so) and the Fadal reads it as a full arc.

Machine parameters-tolerances-machining - .0001". Spline facet - .0010"

Do I need to change some settings?

And why does all of my CAM work not save when I close the drawing?

[Switcher]

I don't have an answer for the Bobcad circles.

You might want to try the free version of NcPlot, before cutting? Might save a headache & material.

[Fadal Error]

Good tip. Thanks. It catches the circles some of the time, but it lets some slip through.

[ger21]

Are they R arcs or IJ arcs?

[Fadal Error]

IJ

[fizzissist]

Assuming you've config'd Bob's post processor to split circles into halves?

Can you post the code where the Bob-circles happen?

[chadwiggan]

ive had this problem on smart cam and i ended up just post processing to a different format.

[Fadal Error]

Originally Posted by fizzissist Assuming you've config'd Bob's post processor to split circles into halves? Can you post the code where the Bob-circles happen?

I will have to check the configuration tomorrow.

If the bad arcs weren't buried in 33,000 lines of code I would isolate them. I know they are all arcs shorter than .001. I found a few small arcs when I posted a single problem letter. Only a small fraction of those small arcs actually gave me trouble. In the huge file it is insane to find one bad line...or three.

[Fadal Error]

Originally Posted by chadwiggan ive had this problem on smart cam and i ended up just post processing to a different format.

Please elaborate. Did you just use a post processor for a different machine and edit to work with the Fadal?

[chadwiggan]

Originally Posted by Fadal Error Please elaborate. Did you just use a post processor for a different machine and edit to work with the Fadal?

yes i processed it to a different machine and just ended up having to edit the first 10-12 lines of code.

[Fadal Error]

Originally Posted by Switcher I don't have an answer for the Bobcad circles. You might want to try the free version of NcPlot, before cutting? Might save a headache & material.

Another thing I will do is just run a Sharpie in the tool holder since NC Plot doesn't catch everything. It still takes time, but at least it won't waste material.

[Delw]

Its a post problem, will happen in every machine if the posts arent configured correctly.
Like chad I have had the problem in smartcam as well years ago, once I rewrote the post Correctly I never had a problem again.

If I remember correctly it has to do with the machine settings in the post under the minimum degrees of a arc , if your using cutter comp its very very touchy in how you set up the posts


Fadalerror thats funnnier than crap I always used a sewing thread needle in a drill chuck when doing stuff like that, My wife years ago told me to use a sharpie as you can adjust the line thickness by the z offset. then I just ended up going to the cadstore and bought some plotter pens modified a tool to fit in a holder and used them as you can get really fine ones.