topic Re: Editing post processor in Fusion Manufacture Forum

Editing post processor

twood213 — Fri, 25 Nov 2016 12:38:50 GMT

Is it possible to edit post processor so it (using generic acramatic)

1- Outputs to 4 decimal places (hoping to solve circle end point error when G02/G03 commands are used)

2- Change start and end of programs to suit machine operator

3- Control whether program is point to point or uses G02/G03 commands

I'm new to CAD/CAM so questions may have been answered many times before?

Regards Kevin

Re: Editing post processor

LibertyMachine — Fri, 25 Nov 2016 13:07:10 GMT

Any Post Processor in Fusion is very configurable. Here are some resources to get you started.:

Post Processors 101

Getting Started Modifying Posts

Post Forum

Now, with that information dispensed:

What sort of issues are you getting that prompt you to want 4 decimal places? Are you working in english or metric? Tightening up the tolerances in the post might help. But yes, it's possible to force out 4x

What are you looking to change at beginning and end of the file?

The RAD/I,J arc issue. There is actually a switch on the post dialog to "useRadius. Set it to "Yes" and this will output radii instead.

And, I just want to make sure the acramatic post is the one you intend, rather than the hundred of others available.

Re: Editing post processor

twood213 — Sat, 26 Nov 2016 01:53:14 GMT

Thanks for your help. The videos where very helpful and I’m able to output to four decimal places. One question I still have may not be a post processor issue?

When filleting an arc/curve does the model contain series of small flats or curves. I created a simple model that put a radius/fillet on the edge of a curve. The outputted program was a point to point program .It was quite large when if G02/G03 commands where used the program would be a lot smaller (one line using G02 would replace many lines of small linear movements). The finish on the machined part would also be better if G02/G03 commands where used as milling machine runs much smother.

The question I'm trying to ask is it possible to fillet curved edges of part with a program containing circular movements

Hope this makes some sort of sense

Regards Kevin

Re: Editing post processor

LibertyMachine — Sat, 26 Nov 2016 02:17:23 GMT

Yes, by it's very design, it should be outputting G02/03 for normal arcs. I say "normal arcs" because there are instances where it will give you lines. Such as a spline or compound curve. The solution in that instance would be to turn Smoothing on. If you are working with a simple part with a simple corner fillet, it should be giving you a radius.

Could you attach the post processor here and I will look at it in the morning? Also on that note: If you make edits to the generic post processor, DO NOT save it in it's stock location. Next time there is an update, it will be wiped out and replaced. Your best bet is to either store it in the cloud or save it to a local folder that is not associated with Autodesk.

Re: Editing post processor

twood213 — Sat, 26 Nov 2016 07:32:08 GMT

Thanks for your help .Smoothing worked and I found a different post processor that should stop "circle end point errors"

Regards Kevin

Re: Editing post processor

LibertyMachine — Sat, 26 Nov 2016 10:02:40 GMT

Umm...What are you using for a machine and control? There are dozens, possibly hundreds of posts available and they all do something just a little different. Any insight into your machine you would be willing to share?

Re: Editing post processor

twood213 — Sat, 26 Nov 2016 12:32:46 GMT

I’m using a 15-year-old Siemens 810D control. This machine is only used for simple drilling and milling jobs using hand written programs. I’m using fusion 360 to learn something about cad/cam and have a bit of fun. I’m new to this control and have just found out that instead of using I, J, and K I can use "CR=" to define a Radius. The post processor for Siemens 840D in fusion outputs programs using CR=. I hope this will solve circle end errors. as I, J and K values may be susceptible to rounding errors?

Re: Editing post processor

HughesTooling — Sat, 26 Nov 2016 22:05:41 GMT

I reported a problem with the 840d post a while ago Here.

The problem was the post is outputting XYZ coordinates in the XZ and YZ planes. My post in the CAM forum never got any interest from support so the bug's still in the post.

Mark