Unable to add a fillet to an offset curve in Sketcher

David Bissonnette

Unable to add a fillet to an offset curve in Sketcher

Hello,

I have created an offset curve of a face by selecting the face and offsetting the boundary curve. Now I want to add fillets to the corners of this offset curve. I am unable to select the 2 discreet elements that I want to fillet individually, as the whole offset curve acts like one entity. I could isolate the offset curve, but then it won't update and the associativity of the offset curve is lost. I also could make the offset by selecting every edge of the face and offsetting them individually but the face I am working with has 100s of edge curves!

 

I'd appreciate any help...

Thanks,

Dave

Attachments

  • Offset Curve.png (12.2k)

Cliff Johnson, Cliff

RE: Unable to add a fillet to an offset curve in Sketcher
(in response to David Bissonnette)


It looks like  you are trying to make a filleted curve for something like a vacuum fixture seal groove? Yes?

You can try performing the offset with a distance value more then you need by the radius you want on the external corners, then offset that result outward again by the radius with rounding.  This will make all the corners rounded. 

If you have the knowledgeware workbench, you can make a slick rule to construct such a curve.and avoid all the problems you will have when the orientation of the surface or extracted curve changes.

 

How to ask questions 

David Bissonnette

RE: Unable to add a fillet to an offset curve in Sketcher
(in response to Cliff Johnson, Cliff)

Hi Cliff,

Good eye! That is exactly what I am making. I've done these many times but was never able to make something like this associative and updateable.

I am trying your suggestion, but I cannot find the rounding option that you mentioned in the offset function (either in sketcher and curve creation.) When I offset it is always sharp cornered.

Can you point me in the right direction?

 

Thanks,

Dave

In Reply to Cliff Johnson, Cliff:


It looks like  you are trying to make a filleted curve for something like a vacuum fixture seal groove? Yes?

You can try performing the offset with a distance value more then you need by the radius you want on the external corners, then offset that result outward again by the radius with rounding.  This will make all the corners rounded. 

If you have the knowledgeware workbench, you can make a slick rule to construct such a curve.and avoid all the problems you will have when the orientation of the surface or extracted curve changes.

 

How to ask questions 

David Bissonnette

RE: Unable to add a fillet to an offset curve in Sketcher
(in response to Cliff Johnson, Cliff)

Hi Cliff,

 

I see an issue: In my GSD workbench my Parallel Curve function does not have a round corner option. I see that in the online docs that it should. (see 2 images attached.  Perhaps its a license issue?

Thanks,

Dave

Attachments

  • Parallel Curve in my GSD workbench.png (27.2k)
  • Parallel Curve in Docs.png (47.5k)

Cliff Johnson, Cliff

RE: Unable to add a fillet to an offset curve in Sketcher
(in response to David Bissonnette)

Yes the Parallel curve function should have an option for "parallel corner type" which you can set to "round".

If you don't have it, likely it is a license issue. 

I wonder if you could still use the KBE curveParallel function to make your offsets with rounding?  

1. Make a datum curve (f(x) tool, add new object of type curve)

2. Right click on the curve and select "Edit Formula"

3. Enter the expression like:  "curveParallel(`inputCurve`,`supportSurface`,10mm,true)"

 

 

 

 

How to ask questions 

Edited By:
Cliff Johnson, Cliff[Toyota Motor Engineering & Manufacturing North America, Inc.] @ Jan 08, 2019 - 11:42 AM (America/Eastern)

Scott Tinius

Unable to add a fillet to an offset curve in Sketcher
(in response to David Bissonnette)
Cliff, I was able to accomplish this with an extract surface, create individual curves, apply corners, trim and join. Didn’t take too long, though there is a bunch of extra geometry that you need to create. Just an offset curve from the periphery will not work. I noticed that there is a funky little curve on the right side that will need to be ignored for your purposes. It will be fully editable as well. If you need different radius values you will need to create them individually.

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W. Scott Tinius
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TECH PUBS & ADV LOG
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From: David Bissonnnette [mailto:[login to unmask email]
Sent: Tuesday, January 08, 2019 9:01 AM
To: [login to unmask email]
Subject: [catiav5forum] - RE: Unable to add a fillet to an offset curve in Sketcher


Hi Cliff,

Good eye! That is exactly what I am making. I've done these many times but was never able to make something like this associative and updateable.

I am trying your suggestion, but I cannot find the rounding option that you mentioned in the offset function (either in sketcher and curve creation.) When I offset it is always sharp cornered.

Can you point me in the right direction?



Thanks,

Dave

In Reply to Cliff Johnson, Cliff:

It looks like you are trying to make a filleted curve for something like a vacuum fixture seal groove? Yes?

You can try performing the offset with a distance value more then you need by the radius you want on the external corners, then offset that result outward again by the radius with rounding. This will make all the corners rounded.

If you have the knowledgeware workbench, you can make a slick rule to construct such a curve.and avoid all the problems you will have when the orientation of the surface or extracted curve changes.



How to ask questions http://www.catb.org/~esr/faqs/smart-questions.html

-----End Original Message-----
Attachments

  • image001.png (55.6k)
  • image002.png (2.6k)
  • image003.png (1.2k)
  • image004.png (3.8k)

David Bissonnette

RE: Unable to add a fillet to an offset curve in Sketcher
(in response to Cliff Johnson, Cliff)

Hi Cliff,

 

Unfortunately we have no KBE workbench either. :(

Looks like I'll just have to offset the face, isolate it, Fix constraint everything, manually fillet the sharp corners and hope that I never have to modify it.

 

cheers,

Dave

David Bissonnette

RE: Unable to add a fillet to an offset curve in Sketcher
(in response to Scott Tinius)

Hi Scott,

Thanks for this. I agree, it is possible to individually offset the face edges, then individually trim and fillet them to get the desired result. In a big commercial wing rib there are literally hundreds of edges that need to be offset and I can't make myself do it! haha

all the best,

Dave

Dessie Diamond, Mr

RE: Unable to add a fillet to an offset curve in Sketcher
(in response to David Bissonnette)

We also come across this when creating seal grooves in our vac fixtures. How we overcome this is by isolating the curve and then fixing it. next with cursor pull a window around complete curve and select the sketch fillet command and input your desired radius. The only down side the curve is not associative

Attachments

  • Fillet to offset curve.JPG (46.2k)