Facing a pocket

I’m working on a jewelry box in oak and I’ve noticed that if my Shapeoko cuts in the same direction as the grains, then I don’t get those ugly lines in the bottom of the wood.

That makes me wonder whether I can do the final pass of a pocket with a facing operation (I’m using Fusion 360)? I’m roughing the below pocket down to 0.2mm of the pocket bottom and I’m want to do the final pass along the grain of the wood:

It doesn’t seem like it’s possible to use the face operation, since it extends beyond the pocket and if I set a stock offset of -3mm, then it simply cuts in the buttons (the ones that are sticking up in the pocket).

Any suggestions on what to do? Right now I’m using a 3D pocket operation for the final pass, but would like to control the direction of the endmill.

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I suppose you also tried the facing op on a selection that includes both the outer profile of your pocket AND the circular boundaries of your five buttons? (using a projection on a sketch if need be). I can’t test right now, I would not be surprised if the facing op did not honor the excluded areas.

I can’t remember if facing ops have the “don’t touch this surface” option in their settings?

VCarve has a nice “raster” option for pocket toolpaths that does exactly this, but Fusion360…I don’t know.

I’ll be watching this thread with interest for the answer.

I sure have. The screenshot you see is actually with both the contour and the buttons selected:

If I set the stock offset to -3mm it almost stays within the contours, but it kind of ignores the buttons:

The facing operation doesn’t have a “Don’t touch surface” setting.

I’ve been looking into the 3D parallel and morph operations as well, but they don’t seem to work on flat surfaces.

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trick it by creating offset circles slightly larger than your buttons ?..but then the overlap between the surface pass and the button finishing pass may not be completely smooth I guess.

It definitely doesn’t seem like a hack’ish kind of solution. It seems weird to me that Fusion 360 doesn’t have an operation like this. Seems like something that people would want to do from time to time?

I agree, hence why I will be interested to hear if anyone knows the non-hackish way to do this.

I dont have a solution for the machineing problem but I do have a suggestion to remove artifacts left behind by the cutter.

Detail Sander - Belt Holder
image
These come in many grits and make sanding in confined spaces easier than trying to use paper on your finger. FYI

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If you NEED to do it this way, I’d draw a sketch with lines representing my toolpath and use a Trace operation. That said, I like @gdon_2003’s solution better.



Zipped Fusion Example (115.1 KB)

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#NeilToTheRescueAgain
#LifeIsBetterWithoutSanding
:+1:

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Seems like that might be the only way. Now the question is how I do it in Solidworks. I’m using Solidworks for making the design and only use Fusion 360 for making the cutting program.

Solidworks has a split line function, but it doesn’t work for open contours. I don’t know if there’s a way of including a sketch when exporting from Solidworks and importing to Fusion 360?

I know not everyone is using Solidworks, but in case there is someone who knows, I’d love to know if there is a way to project an open curve. From what I can see, the only way to do it is with “Project curve”: https://blog.trimech.com/video-tech-tips/differences-between-split-line-project-curve-and-wrap-in-solidworks. Issue is that project curve isn’t included when I export as a STEP-file and import into Fusion 360.

I think you’ll find the sketch environment easy to use in Fusion. Why not just do it there?

I do edits in the design in Solidworks and then import to Fusion. If I have to create a new sketch and such each time I do an edit to the design, it seems like it’s going to be quite a hassle.

Export it as a dxf and import?

Maybe I’m missing something but can’t you use the 3D Parallel operation after roughing out the pocket? You can select the pass direction to match the wood grain and specify “Avoid surfaces” if you don’t want it to touch the buttons.

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That looks exactly like what I want. I can’t get mine to cut along the bottom of the pocket though:



It only cuts in some of the corners. If I set the bottom height to -0.5mm of the bottom of the pocket, it cuts along the pocket:


But if I set the bottom height to something below the pocket bottom, then it’s going to cut deeper than what the bottom pocket is, isn’t it?

UPDATE: It seems like it might not cut past the bottom of the pocket even though the height is below. Thanks for pointing it out @Greenleaf :slight_smile:.

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