Fixing/ removing draft from imported files

[Collin_Korver]

So I have a step file and the person who made it wasnt careful on his draft and radii and there are some micro geometry issues causing havoc on the CAM side of things. I have also experienced times when I would like to remove all draft but have not yet found an effective way to do this. Trying to accomplish 2 things with this post but might have the same solution.

1) A time efficient way to tweak individual draft surfaces. 

2) A time efficient way to remove all draft but retain radii.

I highlighted the draft issue in the model. the draft highlighted is .5 degrees different than the draft elsewhere, causing a step of a couple tenths where it should be continuous.

https://a360.co/2qr4fvy

[TrippyLighting]

Without being able to download the model, and just looking it I the web viewer isn't going to help.

If you can enable the download and maybe even highlight the areas of concern in a screenshot we might be on to something.

[Collin_Korver]

Updated to allow download

https://a360.co/2qr4fvy

[g-andresen]

Hi,

it's not done at the push of a button.
But remove faces might help.

günther

Screencast

[Collin_Korver]

Yes that is how I have been doing it and it is a very tedious and error prone process that is not practical for a complex part.

[TrippyLighting]

It might be somewhat tedious to de/feature this, but it took only 10-15 minutes to remove all fillets from this object. In fact Fusion 360 is pretty darned good and fast at this!

[Collin_Korver]

You removed all the draft and radii in 10-15 min? I often have it where it cannot calculate geometry after a deletion, so clearly the method I am using can be improved. 

[TrippyLighting]

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@Collin_Korver wrote:

You removed all the draft and radii in 10-15 min? 

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"Only" the fillets. I have the advantage that I've done CAD for almost 3 decades. If you put yourself into a designers head and try to figure out in which order the might have applied the fillets you'll have a very good chance of success. However, some geometry is simply to difficult to fix for Fusion 360.

[TrippyLighting]

OK. I timed it with a screencast. It's more like 16-17 minutes.

[g-andresen]

Hi,

You cant expect that individual modifications of a construction can be reversed in a generalized manner.

günther

[Collin_Korver]

Thank you for the time you have put into answering this question of mine. From what I saw, it looks like you select continuous chains of radii and delete and there is no speical way of mass deletion. I presumed that, but its good to validate it.

Once all the radii have been removed, what is your method for removing draft?

[TrippyLighting · Accepted solution]

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@Collin_Korver wrote:

Once all the radii have been removed, what is your method for removing draft?

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There is no particular feature/function in Fusion 360, which would remove draft and it dependsvon the geometry.

I'd measure the draft that is currently on the part and then use either the draft function in Fusion 360 so simply draft in reverse, or the move tool allows you to move faces. I'd select a face, select an edge of the face and rotate around that edge it by the degrees necessary to remove the draft.

But there are limitations what you can do with a given part that is only available in form of a "dumb' solid without feature tree or timeline.

The more features blend into each other the more compound non circularly curved surfaces you have in a design the more difficult it will be for Fusion 360 to do that work.