Fusion 360 Pocket

[Z-Hat]

So I am having an issue with my fusion 360 doing an open pocket, unfortunately I can't share the drawing with anyone pesky non-disclosure stuff but I can share a terrible drawing of the problem I am having


So the blue section is the top of the part the red and white circles are through holes and the yellow is an open slot. the problem I am having is with the section in green. When I try to do a clearing operation on it, I can not get it clear the whole pocket area, the tool path tries to cut around the hole in white leaving everything past it unmachined also at the top right it leaves a radius of the cutter and does not fully machine it. Thirdly the hole marked in red I can not get the darn thing to actually ignore that hole and cut that wall in one contiguous line I have tried doing a patched body to fill in those two holes and drill them from reference points but no luck so far with anything I change it just doesn't wanna work.

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[daniellyall]

Put a sketch in, in the area you are haveing problems with, you select that as your contour to cut

[Z-Hat]

Awesome thank you that helped a lot however I am still getting left over from the cutter not fully engaging the straight corners any advice?

[daniellyall]

is that in sim or real life, the sim can be wrong try fast 3 axis in sim. Would not know why without seeing the model or a redacted series of screenshots, or a redacted model with that bit just chopped out of it and copied to another file. I don't like doing NDA I have to many I am under all ready, If you contact me through the fusion forum I think the one I am under with Autodesk may cover it.

[cygnus x-1]

is that in sim or real life, the sim can be wrong try fast 3 axis in sim. Would not know why without seeing the model or a redacted series of screenshots, or a redacted model with that bit just chopped out of it and copied to another file. I don't like doing NDA I have to many I am under all ready, If you contact me through the fusion forum I think the one I am under with Autodesk may cover it.

I think he's trying to do an open pocket, which seems to be fairly well broken when sketches are involved.

If you want to use a sketch it needs to be a closed form that extends beyond the area you want to machine. I don't like this method though because the tool path algorithm isn't aware that it's machining over an edge, which can lead to issues. Instead I prefer to use a patch so you can select the geometry the normal way (not from a sketch*). Take a look at the attached file for an example.

C|


* Geometry from sketches is fine but I think they end up being used as a band aid too often. The geometry selection just needs to be fixed, especially with open pockets.

[daniellyall]

If a file is native to Fusion, the selection is fine if it's not there are problems, Using a sketch or patch are suggested.

And yes it's a open pocket you can use a 3D toolpath and as long as you select the model you can exstend the toolpath quite easily, most times you can just click on the toolpath and change it to a closed toolpath.

[Z-Hat]

let me check with my customer if I show a small section in a corner I wouldn't think it would be an issue I know I couldn't figure it out what it would be with just a corner.

[cygnus x-1]

Ok, so there are some gotchas with using sketches.

- You can't mix sketch geometry and model geometry. Seems like you should be able to do this, although if you're going to use a sketch you're probably going to make it complete so that it can drive all the tool path by itself. So maybe this isn't really a big deal

- If you use a sketch, make sure to hide the model so that you don't accidentally select some model entities instead of sketch entities.

- There are some bugs with sketch selection with open contours.
-- If you try to select the entire sketch from the feature tree you don't get any arrows to flip the side to machine.
-- If you need to select multiple entities it won't select them as a single chain (meaning if you click an entity and then click it again to edit the chain, it won't let you select any more entities). You have to select each entity as it's own chain. As it turns out it will still generate a path but the selection process is a bit confusing since it's not quite the normal way of doing things.


What you should see is a single path and arrow like such:





But instead what you get is this:





C|

[daniellyall]

If thats a 2D toolpath, it's upto you to control it fusion can not control 2D toolpaths they are dumb, with 3D toolpaths fusion is model awer it can do most of the work for you, so if you have to use a sketch use a 3D toolpath

[Z-Hat]

Awesome thank you all so much got her worked out today and now for a run of 3000 of these boogers

[daniellyall]

By chances what was the fix

[Z-Hat]

Did it as a 3D tool path and completely flabbergasted myself as turned out perfect great chip load, perfect movement, and cleared everything out.

[daniellyall]

good stuff