Setback fillet corners

Ben_ · March 2018

Anyone have a easy way or workaround for making setback corners on fillets?

mahir · March 2018

It's not a great approximation, but here's a klugey version using a thickened Fill surface. You can get asymmetric setbacks using tangent splines instead of fillets.

https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/36ee196d49bb6177586cd6ae

Ben_ · March 2018

I am looking for something more like this, where the edges are filleted as well. This is from a SaladWorks import of a model I could not make in Onshape

Image: https://us.v-cdn.net/5022071/uploads/editor/ma/1q0hvfsvxmrn.png

mahir · March 2018

This is waaaaay overly complicated, but maybe the method can be adapted to your purposes.
https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/36ee196d49bb6177586cd6ae

mahir · March 2018

Slightly less complicated and more robust. This method uses the built-in fillet feature on the edges, which allows for conic or curvature based fillets.

Image: https://us.v-cdn.net/5022071/uploads/editor/in/a8fiw37y9yvc.png

owen_sparks · March 2018

Ben_ said:

This is from a SaladWorks import of a model...

Sorry for butting in but I've got to ask; does their version of @cody_armstrong start all his webinars with "Lettuce begin"?

O.S.

MBartlett21 · March 2018

owen_sparks said:

Ben_ said:

This is from a SaladWorks import of a model...

Sorry for butting in but I've got to ask; does their version of @cody_armstrong start all his webinars with "Lettuce begin"?

O.S.

@owen_sparks

No, i don't think so.

Ben_ · March 2018

mahir said:

This is waaaaay overly complicated, but maybe the method can be adapted to your purposes.
https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/36ee196d49bb6177586cd6ae

NICE! Thank you!

antoine_richermoz · April 2018

Hi, I also think that setback fillet are really cool !
I was inspired by your posts and I've created a FeatureScript to make setback fillet more easily.
It's not really working at the moment but it's a start.

https://cad.onshape.com/documents/f485cc30540487626b6edd97/w/17f3dfcf7c0c7ed4f1968990/e/0a2b519de9b570367e0e2d62

antoine_richermoz · April 2018

Ok guys I've done it !

https://cad.onshape.com/documents/f485cc30540487626b6edd97/w/17f3dfcf7c0c7ed4f1968990/e/4ee9436e4068adbe15f4ced4

It takes ages but it works !

MBartlett21 · April 2018

@antoine_richermoz
That is a really cool FS

mahir · April 2018

I agree. Pretty cool. I noticed though that it only works for cubic corners? Maybe you can build in some more flexibility into future iterations.

MBartlett21 · April 2018

antoine_richermoz said:

Ok guys I've done it !

https://cad.onshape.com/documents/f485cc30540487626b6edd97/w/17f3dfcf7c0c7ed4f1968990/e/4ee9436e4068adbe15f4ced4

It takes ages but it works !

@antoine_richermoz

It should probably be using GeometricContinuity.G1 instead of GeometricContinuity.G2
GeometricContinuity.G1 is tangent, which is what mahir used

Fixed document here: https://cad.onshape.com/documents/904601e58ce93805af2393bd

MBartlett21 · April 2018

@mahir
Currently it only supports faces with 90-degree edges :-(

antoine_richermoz · April 2018

mbartlett21 said:

@mahir
Currently it only supports faces with 90-degree edges :-(

True, but this shouldn't be too hard to fix

antoine_richermoz · April 2018

mbartlett21 said:

antoine_richermoz said:

Ok guys I've done it !

https://cad.onshape.com/documents/f485cc30540487626b6edd97/w/17f3dfcf7c0c7ed4f1968990/e/4ee9436e4068adbe15f4ced4

It takes ages but it works !

@antoine_richermoz

It should probably be using GeometricContinuity.G1 instead of GeometricContinuity.G2
GeometricContinuity.G1 is tangent, which is what mahir used

Fixed document here: https://cad.onshape.com/documents/904601e58ce93805af2393bd

This is really easy to change, you can also add a option in the feature dialog

mahir · April 2018

Here's a slightly different approach that doesn't require right angles and uses a setback distance instead of a setback radius. It uses about a dozen features, so if I have time (or someone else), this should definitely be featurescripted.
https://cad.onshape.com/documents/57acdfaae4b005c413ed9b6f/w/3fd585a46d3af1b3ba413c53/e/36ee196d49bb6177586cd6ae

Image: https://us.v-cdn.net/5022071/uploads/editor/lr/bu8apolphj2w.png

MBartlett21 · April 2018

@antoine_richermoz

You might also want to restrict selecting of planar faces and fillets that are not at corners.
You could update your filter to be:

EntityType.FACE && !GeometryType.PLANE && !GeometryType.CYLINDER && !GeometryType.EXTRUDED

antoine_richermoz · April 2018

@mahir I don't really see the difference ?

antoine_richermoz · April 2018

Good idea @mbartlett21

mahir · April 2018

@antoine_richermoz
The end result is mostly the same, but the updated method is more flexible and can be applied to non-cubic corners because it doesn't require a circular pattern. I'm actually almost done with a featurescript version.

@mbartlett21
Instead of

!GeometryType.PLANE && !GeometryType.CYLINDER && !GeometryType.EXTRUDED

it's easier to just specify

GeometryType.SPHERE

MBartlett21 · April 2018

@mahir

But if you had two fillets of radius 2mm and one fillet of radius 1mm coming together at a corner, you wouldn't be able to do it.
You also wouldn't be able to do it with conic or curvature fillets

mahir · April 2018

@mbartlett21
I'm just ignoring that case for now. If you look, joining fillets of different radii isn't pretty at the moment (see below). And dealing with a setback fillet that involves selecting more than just one corner surface seems a bit above and beyond for what is normally just a simple single-radius feature.

mahir · April 2018

And voila, the finished FS! Not to steal your thunder, @antoine_richermoz, but I thought it was important to make the setback distance editable and add support for non-90deg corners.

https://cad.onshape.com/documents/833dffabd805010ce935bee2/w/d15b586cc7aa564eee76cc28/e/45bbda3a08e8edd18c192163

antoine_richermoz · April 2018

Great work @mahir your script is much cleaner than mine !
It still pretty slow, but I think it will be as long as we use the fill feature

mahir · April 2018

Thanks @antoine_richermoz. Yeah, it takes about 300-400ms per corner ¯\_(ツ)_/¯, even with just G1 continuity. But thankfully OS is pretty good about caching geometry. So if you’re not changing parameters too often it won’t come into play so much.

Setback fillet corners

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