I've been trying what seems to be everything to make certain radius on a rib feature sharp corners. Please see my attached photos and model. Please help and any advice is greatly appreciated.
Well, that was fun.
While the usual regimen of delete faces etc. failed miserably. And automatic FeatureWorks yielded the usual mess. Interactive FeatureWorks gave remarkably good results with little effort. Just select "Delete Faces" instead of "Recognize". You do have to select enough faces at once to get it to work. But in this case anyway, not all the fillet faces at once. If you select all the fillet/rounds the entire feature is deleted. Note that I have left the inside vertical fillets unselected. After deleting the highlighted faces, I repeated the operation to square up the inside corners.
I don't think it will be easily possible to remove the radius from the just the outside corners, without also removing the connected top rounds and bottom fillets. But you should be able to easily replace the ones you want.
You can try direct edit, delete face.
Some time you can direct edit and offset the surface to get bigger/small fillet and chamfer.
It could be a lot of work, but here are a couple options.
Surfacing: offset the flat surfaces by 0.00, then take resulting surfaces and use un-trim surface to extend them, then trim-surface to tidy up the corners. Then recreate your solid. Tedious stuff....
Solid modeling: Do a series of cut-extrudes to remove the filleted portions on the internal corners and regular extrudes for the outside corners. Again, a good bit of work for what should be pretty simple operation.
The Delete Face is the best tool to get there, but you might also try using FeatureWorks to see if it will recognize some of the fillets as features, which can then just be deleted as features.
From your picture, on the left side of the face selection, you can see that the fillets go underneath, which means the ribs aren't connected to anything on that side.
I think the fillets appearing to go underneath is an optical illusion. On the right side they look normal.
Shawn Stugard wrote: I think the fillets appearing to go underneath is an optical illusion. On the right side they look normal.
Shawn Stugard wrote:
Yep, you're right. Was going from the image, not the model. Delete Face is what I'd try for the limited number of faces you've got here. Should work easily on geometry this simple.
Try right-click on the radius itself and select Recognize Features.
After importing the STEP, you have a corner where the bottom surface of the part is interfering with the corner of the radii. It doesn't know what to do with the feature.
If you look at that corner with tangent edges with font, it looks like the fillet corner is not tangent.
..one of those which seems easy but is a pita,.. some surfaces which will not extend/trim easily.. but.. if you isolate some of it..it takes cutting back away from the fillets,.. offsets, replace//extendeding/trimming.. replace faces,.. combine and it's possible.
Thanks to everybody's input. Erik I was able to get this to work using your method with little effort which is what I was looking for.
I should give kudos to Eric Beatty for hyping the virtues of FeatureWorks at more than one recent user group presentation. I don't recall if he mentioned that particular "trick" but it got me looking a bit more at the options available. When I first learned about FeatureWorks it wasn't available in a standard SW license, and it's still not as high on my radar as it should be.
Once I figured out some of the quirks, I was surprised how easily that worked. Selecting all the fillets was the slowest part. It was a bit of a toss up between manually selecting each one and letting the Chain feature look for "chains". A faster computer on my end would probably make a difference too.
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