topic Re: "in control" compensation with 2d wraped countour issue in Fusion Manufacture Forum

"in control" compensation with 2d wraped countour issue

Anonymous — Tue, 02 Oct 2018 08:49:24 GMT

hello i have some issues with a wraped 2d countour

when i selected compensation type "in computer" than all simulated correctly

but when i change comp type to "in control" it simulates strange.

is it a bug, or i did somethin wrong? i use a swipped face as a source for 2d countour

see a screencast

https://autode.sk/2Rjt3yC

Re: "in control" compensation with 2d wraped countour issue

andriy.badin — Tue, 02 Oct 2018 11:51:59 GMT

Hi @Anonymous

can you share model?

Thanks,

Andriy.

Re: "in control" compensation with 2d wraped countour issue

zwelsh91 — Tue, 02 Oct 2018 14:48:00 GMT

"In Control" will generate the tools control point (the toolpath lines) on the contours you are driving. Where as the offset for the tooling you are going to use is a value input as the radius of your cutter in the tool data (offset Table) on your CNC machines controller. Thus the meaning "In Control". Simulating this toolpath will always over cut your part by the radius of the tool you are using.

"In Computer" References that the CAD/CAM software applies the radial offset while computing the toolpath, but does not offer the code (G41, G42) for cutter wear compensation out of the post processor.

"Wear" is what you are probably looking for. The software will generate a toolpath offset by the radius of the cutter and also output the associated nc code (G41 and G42) for radial cutter comp when posted.

Here is a screen shot of the Tool Tip from Fusion:

Re: "in control" compensation with 2d wraped countour issue

Anonymous — Wed, 03 Oct 2018 04:34:33 GMT

hello, thank you i'll try

if i right understood you,a simulation of a toolpath with "in control" will always show a tool tracing the toolpath by its centre, not by its radius? is it bug or there is reason why it works that way?

Re: "in control" compensation with 2d wraped countour issue

Anonymous — Wed, 03 Oct 2018 05:09:00 GMT

strange, in other countur simulation with "in control" enabled, simulation works correct

Re: "in control" compensation with 2d wraped countour issue

zwelsh91 — Wed, 03 Oct 2018 15:18:03 GMT

Thanks for sharing your file. I have taken a look at what you have so far . Everything looks to be "In Computer" and "Wear" for cutter compensation in the first machining setup group (4 4), it looks like all of the toolpaths are missing geometry in the second setup group(5) .

It has been my understanding that "In Control" will always put the tool center point on the defined geometry (MasterCAM, SurfCAM, Fusion 360 ETC..) unless you add stock to leave, then the software offsets the toolpath by the amount you define. "In Control" is a fairly "Old School" way of programming. Back in the day when they didn't have powerful computers and software (early stuff like: paper tape punchers , tape readers and manual input) to automatically calculate toolpaths offset by the radius of the cutter. They programmed everything in absolute values and then used the machine controllers to offset the values using tool length and radius offset tables.

The only thing I see that is a little off is if you change the cutter comp back to "In Control" for the contour you shared in the screencast. and try to simulate it. The strange part is that when you generate the toolpath and look at it everything looks fine. But once you simulate it and show the toolpath with the simulate settings the generated toolpath seems to move to the outside of the part rather than where the defined geometry is. This is something i would ask the Autodesk Team about to clarify if it is operating correctly or if it is really a bug.

Re: "in control" compensation with 2d wraped countour issue

andriy.badin — Wed, 03 Oct 2018 15:52:16 GMT

Simulation of op 2D Contour2(14) indeed looks strange when using "In Control" compensation settings. I logged ticket CAM-11224 to investigate this behavior. I will keep you posted about my findings.

Best regards,

Andriy.

Re: "in control" compensation with 2d wraped countour issue

Anonymous — Thu, 04 Oct 2018 16:40:41 GMT

thank you for your attention

no, in control is very useful when you need to catch 0,02 mm allowances, you mill your slot, then check it with micrometre, adjust tool offset and start new machining programm, you don't need go to pc and recalculate your toolpath

Re: "in control" compensation with 2d wraped countour issue

Anonymous — Thu, 04 Oct 2018 16:41:31 GMT

thank you, i'll wait for any news about it

Re: "in control" compensation with 2d wraped countour issue

andriy.badin — Mon, 12 Nov 2018 19:06:03 GMT

@Anonymous sorry for delay... According to kernel team "We should only allow center compensation when using Wrap.". I don't know if it will be changed any time soon, or if other options will be removed to avoid confusion.

Best regards,

Andriy.