Turning/Mill - Unwrap Cyclic geometry

[CCarreiras]

Hi!

It's possible to machine this curved groove in a turning/mill setup?

I'm not a pro on CAM but...
I tried to use 2D contour, but there's a cyclic geometry error...

Part attached if you want to give it a try.

Thank you!

[kacper.suchomski · Accepted solution]

Hi Carlos

This is a very old and annoying limitation.

Unlike Fusion, Inventor CAM doesn't support "boundless" wrapped pockets.

In Inventor, a pocket must have an end (the start can be open).

If we assume that the part is symmetrical, we can blind the fragments and use the symmetrical pattern in path programming.

We can use an additional model state for this purpose.

For a non-symmetrical part, you'll need two additional model states (or two solids or surfaces, depending on the geometry range).

Either way, preparing the solid for toolpath creation requires additional modeling.

Once you have your model ready, a wrapped 2D pocket should do the trick.

[CCarreiras]

Hi @kacper.suchomski , nice Workaround!

In Fusion is possible to do that part without the workaround?

[kacper.suchomski]

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@CCarreiras wrote:

In Fusion is possible to do that part without the workaround?

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Yes, but I don't have access to these tools.

https://help.autodesk.com/view/fusion360/ENU/?guid=MFG-MULTI-AXIS-ROTARY-CONTOUR-READ

https://help.autodesk.com/view/fusion360/ENU/?guid=MFG-MULTI-AXIS-ROTARY-POCKET-READ

[kacper.suchomski]

In Inventor, you don't have to interfere with the geometry itself, but it still involves additional work.

If you calculate the geometry correctly, the second operation can skip the tool insertion using the helix to avoid wasting machining time and start with a full depth.