topic Re: Chamfer and Fillet in Fusion Design, Validate & Document Forum

Chamfer and Fillet

qcshipping — Wed, 27 Sep 2023 18:25:53 GMT

So..... Newer to Fusion 360, even newer to posting on the board. Hopefully, I chose the right board.

I'm designing a part based on a Part D Female x Female camlock/NPT coupler. We get some proprietary parts made for some of our products.

The problem I'm having is when designing them I embossed rectangles on the cylindrical surface. Sides A & C are the same dimensions and Sides B &D are the same dimensions. All embossed rectangles are the same depth at .135".

After all the embossed parts I chamfered the bars separating the embossed cut outs, followed by fillet the bars for a rounded top.

The problem: even though I used guidelines; 4-sided polygons (construction lines) on planes, that are parallel; for the sketched rectangles I used to do the embossments, when I do Chamfer and Fillet and zoom in it clearly shows the top and bottom lines are clearly not on the same plane.

any suggestions?

Re: Chamfer and Fillet

davebYYPCU — Wed, 27 Sep 2023 18:55:35 GMT

Fusion relies on 100% accuracy. Likely a workflow problem, aligning around the corner.

Cant get to the file for a while yet, but consider a series of base sketches and vertical Extrudes.

Do one, and use modelling tools to mirror/s or circular pattern to make the other 3 ribs. Much simpler.

Blue lines in sketches should be the first clue.

Might help....

Re: Chamfer and Fillet

laughingcreek — Wed, 27 Sep 2023 20:04:02 GMT

your sketches are generally not fully constrained, which isn't doing you any favors. Good practice is to fully constrain unless you have a particular reason not to.

fillets, chamfer, and emboss are all considered finishing tools. meaning they are usually the last thing to be done. they can induce geometry imperfections and shouldn't be relied on for further modeling. exception to every rule of course, but a good thing to keep in mind.

for instance looking at the corners at the emboss feature we can see a slight variance in the z direction-

not much, but way more than enough to screw with future function.

so rule of thumb, avoid layering these operations on top of each other.

attached is a possible way to achieve this geometry. note the only 2 sketches needed for this are fully defined, making tweaks to the geometry rather easy by editing the dimensions in the sketches.

Re: Chamfer and Fillet

qcshipping — Wed, 27 Sep 2023 21:00:39 GMT

@laughingcreek Thank you for responding so quickly.

Some good advice and direction from you're drawing. I think the slight variance on the z axis is a result of the embosses are two separate sizes. two are slightly wider as the camlock arms haven't been inserted yet. But your advice and direction is something that I will definitely implement.

While I was waiting, I used @davebYYPCU suggestion of mirror the posts but before I mirrored them, I split the body twice and used Push/pull instead of embossing. Created the post and then mirrored it on both x & y planes. Considering chamfer and fillet as finishing tools is not something I thought about before but will definitely remember.

It's hard as I'm new to fusion and I'm used to Shapr3d. But since Fusion talks better, file format wise, to other Autodesk apps I'm doing my best to learn it.

I only hope that auto desk develops an iOS version of the program. Being able to use the touch screen and apple pencil makes things so much easier.

Re: Chamfer and Fillet

davebYYPCU — Wed, 27 Sep 2023 23:01:43 GMT

In addition, and while you are learning, (modelling in an Assembly file) check out,

Rule #1, Grounding, Joints,

Fully defined Sketches,

modelling work reductions with Patterns / Mirror

If using the Timeline forget about

Press Pull (body loses it's sketch relationships,) use Edit Sketch and Edit Feature.

and modelling Move Tool, use Joint.

Might help.....