Odd Chamfer Behavior

[B0wler]

Hi All,

New to Fusion 360 and CAM and just finding my feet. I am running through some tutorials/demos but I am coming up against an odd problem with chamfering. The model I am using already has chamfered edges so I am trying to use the 2D Contour tool path as suggested in other posts. I have selected the lower contour of the chamfer as recommended.

I am using a 6mm 90 degree chamfer tool that I have defined with a tip diameter of 0mm to cut a 1mm 45 degree chamfer around the top edge of a bore. The chamfer width is set to 0mm and Tip offset is set to 1mm as suggested in other posts.

The chamfer works but it is cutting too deep. Adjusting the chamfer parameters has no effect, the only thing that seems to stop it cutting too far is changing the Bottom Height. Is this the correct way to do it?

Any advice on what to try would be much appreciated. Part is attached if that is useful, TIA.

[engineguy · Accepted solution]

@B0wler 

Hi Robin

Right, this may or may not be to your liking but here goes anyway.

The best/proper way to do Chamfers is to use a sharp corner so what I always do is before I start Chamfering my Model I make a copy of the Body so it keeps the sharp edges, you can if you want do it all and then when your model is complete make a copy and then delete all the Chamfers.

The Body with no Chamfers will be the Solid Stock for the simulation later.

By using the 2D Chamfer strategy instead of a 2D Contour you have full control over the Chamfer width, tool offset, leadin/out etc, etc.

Just my 2 cents worth but it does work way better using the correct 2D Chamfer instead of "fudging it" with the 2D Contour.

I have just done a rough modification to your original file using your original size tool which I have attached here, you can do all the tweaking of feeds/speeds/entrys etc, etc, have a look and if you think it is to your liking then enjoy 🙂 🙂

If not then please explain why not so that others in the Community may understand your reasons 🙂 🙂

Regards

Rob

[B0wler]

Thanks @engineguy, your help is greatly appreciated.

Your approach definitely works and I can see the logic behind it. I was just hoping to avoid redefining the geometry as it defeats the object of designing it in in the first place, especially if you are also generating 2D drawings of the part from the same model.

Forgive me if this is a stupid question: I am a SolidWorks user primarily and am new to Fusion 360 (though I have to say I am pretty impressed so far). In Solidworks you can have part configurations that enable you to suppress any number of features at the click of a button and thus save having multiple versions of the same model. Is there any such feature in Fusion?

In any case, this has got me moving forward so thanks again!

[Anonymous]

@B0wler

Just remember that Chamfer is not fully model-aware and it could sometimes generate unxpected toolpaths, so check simulation, don't take for granted that everything would be OK.

As for configurations, they are non-existent in Fusion 360(some old third-party add-on exist for this but it has some quirks), as many other features of SolidWorks that are "bread and butter" for someone who has decent experience with SW.

[engineguy]

@B0wler 

If you want to carry on using a fully modelled part and trying to Chamfer the already modelled faces the what you have to do is select both the top and bottom edges of the modelled Chamfers, Fusion will throw up an error saying 

"Warning: No passes to link.", why it throws this error I have no idea because it does generate the toolpaths fine 🙂

Fusion never ceases to surprise 🙂 🙂 🙂

Modified file attached.

Regards

Rob