Fillet HELP

andrew_banham

Hi Everyone

What settings are required to make this fillet run smoothly around this corner?
I have been tinkering for over 2 hours!!!!

(studycadcam.com > 3d objects #1136)


 

NeilCooke

You can’t run a smooth fillet around a sharp edge, it’s impossible. Looks like they filleted the edges then cut the side faces back which is a nonsense from a manufacturing standpoint. 

MichaelPascoe

@andrew_banham Neil is right for this approach. But if you make your document public and share a link. We will get it smooth one way or another.

NeilCooke

NeilCooke said:

You can’t run a smooth fillet around a sharp edge, it’s impossible. Looks like they filleted the edges then cut the side faces back which is a nonsense from a manufacturing standpoint. 

I suppose it could be a machined casting/forging 

andrew_banham

Hi - Thanks for the comments and suggestions!!

I have made a copy public:

https://cad.onshape.com/documents/62886837febc9350bd732264


below is the drawing that my students are working from:

NeilCooke

This is how they've done it. It's not a good example - please choose something else for the students to learn!
https://cad.onshape.com/documents/f783e918dfee7f9b573017bd/w/02b9096a4765b7809e4619ef/e/ae7df2f080c3ba92bcb418d7

eric_pesty

Here you go, the trick is that the fillet is not tangent to the vertical side of the part. I guess it could be molded wider with a full fillet and the faces machined back... Odd way to model this though.



https://cad.onshape.com/documents/d43a16eedc2228831ea03cf3/w/fb6a49850a91a3ae9e84b7b1/e/6b284623947bba811c497486

dirk_van_der_vaart

@eric_pesty
Maybe this is an odd way to model this but I am sure when you produce a part like this it will look like this.
The fillet's are made in the mold and you have some drilling and milling to finish the part.

Parts like this normally have 2 separate models, 1 is the mold product and 1 is the final product.

eric_pesty

@dirk_van_der_vaart
Yes, I agree this would be something you would get with a 2 step process and it would make more sense if there were two drawings.
That said if I was designing a part like this, I would might want to keep more of the fillet as it seems rather pointless to have it there in the first place.
I guess my point was that it's a bit of a curveball as far as a "modelling exercise" without some extra information, especially with the horizontal break in the angled face ending up coplanar with the top face after machining, that really threw me off!