Problem with face draft.

[Anonymous]

Hi,

I’m having trouble getting the Draft Face tool to act correctly (or what I would think to be correct).

In the picture the draft is correct apart from along the edges (marked with red circle in the picture below) where it sticks to the side.

What do I need to do if I want it to have the same continues draft?  

This is for a plastic moulded part so there has to be a release angle. I’m using Inventor Professional 2013 Student Edition.

//Peter

[wilkhui]

Hi Peter,

Are you able to post a part that exhibits the behaviour you describe?

Thanks,

Indy

[Anonymous]

You may want to look at using a swept profile to create your drafted runnoff,  gives you more control, especially on a curved, part,  face draft works better on simpler shapes.

T.S.

[Anonymous]

Indy, the .ipt file shows the same situation I'm in.

I do not want the edges of the rib to follow the body horizontally, but instead have the same angle as the rest of the draft all the way. 

Thanks for the response,

Peter

[Anonymous]

Hi T.S. I'm not sure how I would go about doing this with the sweep tool. 😕

I did however find a way around this; I made a rectangular sketch from the bottom instead and extruded it up to the rest of the body with a taper to get the angle. But I then had to cut out the profile as the extrusion made it flat and not curved as I want it. 

THnks for response!

Peter

[wilkhui · Accepted solution]

Hi Peter,

Can you try creating this as a Rib feature instead of an Extrusion and see if you get the Draft result you need?

I've attached a similar example (the feature is FaceDraft3_Rib1, highlighted) that I think has the result that you're looking for, hopefully it helps but if you're still having trouble then feel free to ask for the actual part with the draft, I just wanted you to have a go at it 🙂

You may not be able to open the part file, since the file you attached indicates that you haven't installed Service Pack 2 (you can install it here).

Further, your dimensions of 3mm in Sketch2 reference slightly different things, did you intend for these to be non-symmetrical?

Best wishes!

Indy

[Anonymous]

Here are some sweep methods to produce a similar result with more control.

Should look like this in wireframe mode:

Now thie sweeping,  and this is where you want to play with the buttons to see different results.

And try path with guide rail for even more control:

Mirror when you get a result you want, and combine back with the rest.

Use DeleteFace with the Heal Box checked to clean it up.

And the Final with a little welding.

Hope this helps

T.S.

[Anonymous]

Hi Indy!

Ah yes, the rib feature does seem like the best way to tackle this, much less work. I also se I have taken a wrong approach to the Face Draft, I did not realise I would get a different result if I drafted from the bottom (the open end). It indeed did give the result I was looking for!   

No, the 3mm dimension in Sketch2 was NOT meant to be non-symmetrical.  That was a mistake on my part when I just sketched it too fast for the example. Sharp eye! 

Also thanks for the tip about SP2!!

Many thanks!

Peter

[Anonymous]

Hi T.S!

Thanks for the response!

Very thorough description! Indeed, it helped a lot! 😄

Must say guide rails and paths are very picky things! 

Many thanks!

Peter

[wilkhui]

Glad that helped, happy inventing!

Indy