edge/face blend woes
edge/face blend woes
(OP)
NX10
Can anyone help spot what I'm doing wrong here? I'm trying to add a "simple" .5R fillet to the inside corner shown. I've tried both edge and face blends, but I'm no expert with either. It's always that last little bit that it won't apply the blend to. Ideally, the picture shown with the attempted face blend is what I'd like to achieve (or similar), but it would have to "patch" the missing surface (shown by the green/yellow adjacent surfaces).
Any ideas?
-WRM
[URL=http://s226.photobucket.com/user/WRMorrison/media/...]
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[URL=http://s226.photobucket.com/user/WRMorrison/media/...]
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Can anyone help spot what I'm doing wrong here? I'm trying to add a "simple" .5R fillet to the inside corner shown. I've tried both edge and face blends, but I'm no expert with either. It's always that last little bit that it won't apply the blend to. Ideally, the picture shown with the attempted face blend is what I'd like to achieve (or similar), but it would have to "patch" the missing surface (shown by the green/yellow adjacent surfaces).
Any ideas?
-WRM
[URL=http://s226.photobucket.com/user/WRMorrison/media/...]
[/URL][URL=http://s226.photobucket.com/user/WRMorrison/media/...]
[/URL] 




RE: edge/face blend woes
I think You have encountered an geometrical situation which is very difficult to handle for a blend.
Quite often the difficult thing for a blend is how to start and end, not the tangency conditions.
The red highlight is the edge of a face which seems to bend in-over the new blend, there is the problem. The blend has difficulties stopping/ trimming at/to this face.
Try make the new blend slightly smaller such that it's tangent line don't touch that face, i guess that it will work.
Try see if you can temporarily delete this small face and if the blend then works.
Regards,
Tomas
RE: edge/face blend woes
Under the "Variable Radius Points" rollout menu you can select multiple points along your curve string that will each have a different radius value.
You may be able to have 0.5R all the way till very close the the end then tapering down slightly to where the blend works, maybe 0.45R or something.
Play around with it and see what works. Like Toost said, you have encountered a geometry set that is not calculable with realistic 3D results, nothing wrong you yourself are doing except maybe planning your model out to avoid such conditions.
You can also get creative in these situations if you are completely cornered, by making your own wireframe and custom surfaces/solids in these types of regions. I would not recommend that as it not really good practice but it can work in a pinch.
Felix K. Holloway - Designer - NX 9 & 11
RE: edge/face blend woes
I need to maintain the .5R because that is what this feature will be machined with (Ø1.0 ball e.m.). I'll have to try another work-around to get the desired result I guess instead of edge/face blend.
-WRM
RE: edge/face blend woes
It will be a separate face not connected to your body.
If your main body is a solid, you can now "Thicken" that face, "untrim" relating faces (from your main body) and "Trim Body" of the thicken with those faces, then "Unite" your thickened blend into the main solid.
If your main body is a sheet, you can use a similar process but use "Trim and Extend" on your sheets rather than "Trim Body" and "Unite".
That would be a last case resort though but usually works for me. Better to have clean geometry that works properly but you gotta do what you gotta do.
Felix K. Holloway - Designer - NX 9 & 11
RE: edge/face blend woes
RE: edge/face blend woes
John
RE: edge/face blend woes
Felix K. Holloway - Designer - NX 9 & 11
RE: edge/face blend woes
RE: edge/face blend woes
Felix K. Holloway - Designer - NX 9 & 11