Variable Blend Radius

[jonmwilson]

I have a slot punched through a thick solid body. On one end of the slot I need the edge to have a .13R blend while the other end is .38R. I have used variable radius points for blending before but when I try to use it on the slot it either changes it all to .13R or all to .38R. Any ideas on what I could be doing wrong? Thanks.

 

[JohnRBaker]

What version of NX are you using and could you at least provide a picture of what the 'slot' looks like?

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

To an Engineer, the glass is twice as big as it needs to be.

 

[jonmwilson]

Attached is a rough drawing of the slot I am talking about. I need one end of the slot to be .13R and blend into .38R as shown in the top view. In my model I have just created the two blends seperately like you can see in the front view but I figured there was a better way to do that.

 

[jonmwilson]

I am using NX 6.0

 

[jerry1423]

It would help even more if you could supply a model, because the part looks a bit complicated.
Maybe just supply the portion of the model that contains the slot. If you supply it without the blend then an unparametized solid would work find.

 

[jonmwilson]

Here is the start of my model.

 

[jerry1423]

I am not sure if I got it quite right or not, but it will give you an idea on what to do.

 

[JohnRBaker]

The attached model is about as good as it's going to get (at least from where I'm looking at it). However the maximum blend radius had to be reduced to 0.379R due to a tangency problem at the 'top' of the blend. BTW, when working with models this complex it's best to shade with the face-edges ON as this will help you when you wonder where to place your blend radius 'points' as well as showing you where potential problems might be, as in the case of the tangency at the 'top' of the blend.

John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA

http://www.siemens.com/plm

UG/NX Museum:

http://www.plmworld.org/p/cm/ld/fid=209

To an Engineer, the glass is twice as big as it needs to be.

 

[jonmwilson]

Thanks. That is much better.

 

[mmauldin]

I generally find that in situations like this I can get a more controllable result by using face blend along with a tangency controlled radius. Take a look at the attached model for an example.

 

[mmauldin]

I just saw the part about NX6. The file I uploaded is NX7.5 and I no longer have NX6. Sorry about that. For what it is worth, attached is jpeg of the result.