topic Re: Post Processor converts circles and ellipses into lines in Fusion Manufacture Forum

Post Processor converts circles and ellipses into lines

erik — Tue, 10 Oct 2017 18:27:19 GMT

Hello

I am new to the topic of CAM and Post Processors but I have a general idea of how it is working, and I should say that I am doing cutting using a waterjet cutter. I used the default jet.cps file as a template to create a custom CPS-file primarily to change the syntax of the commenting.

But as I was working today I noticed that when using the post processor the circles and ellipses gets converted into lines (G1) in the NC-file which result in several hundred lines of code.

When I try to cut arcs it write code telling the machine where the starting coordinates and center coordinates are (G2). This way the cutter calculates the path to cut.

I don't know, but shouldn't it be able to do the same with circles and ellipses?

I hope the above description was understandable, otherwise just write a comment and I will try to explain it more in detail.

Attached NC-files of the 3 figures on the image.

Best Regards

Erik

Re: Post Processor converts circles and ellipses into lines

Anonymous — Wed, 11 Oct 2017 10:16:54 GMT

Ellipse will always be small lines, given that's what they are always in reality. Other than that turn on smoothing and it should shorten you code into something a little more normal and to your liking.

Re: Post Processor converts circles and ellipses into lines

erik — Wed, 11 Oct 2017 12:56:56 GMT

Thanks for the response. Where to I change the settings for smoothing?

I still don't get it for the circle. Shouldn't one be able to draw a circle from a single arc.

In that case, why do the post processor try to cut it into small lines?

- Erik

Re: Post Processor converts circles and ellipses into lines

GeorgeRoberts — Wed, 11 Oct 2017 13:06:28 GMT

Hello,

The smoothing option can be found in the 'passes' tab of each operation, enabling this should solve your problem.

Would it be possible to share a copy of your part so we can see what is happening here?

Re: Post Processor converts circles and ellipses into lines

erik — Wed, 11 Oct 2017 13:53:54 GMT

Thanks for the quick response.

I tried the smoothing and already at 0.01 mm i went from 400 lines to just above 100 lines of code with some arcs.

I even pushed to the next tick on 0.02 mm and it printed 60 lines of code and almost all of it where arcs.

After that I tried to cut a new circle and know i suddently worked and cut the circle in two arcs, so I don't know what caused the problem in the first place.

I also cut the circle in half to make sure it would do the same and it did.

I attached the model (Didn't know if that was what you where asking for by referring to 'part') and the nc-files of the ellipse with smoothing turned on.

- Erik