fillet again

 From: malvin 23 Jul 2008  (1 of 13)
 Hi Please advice what I am doing wrong I tried various shapes of ring – in each the circle edges after sweep fall apart thus I cannot fillet them. In other cases one side is solid edge on the opposite – all broken I did the curves smooth – are they not smooth enough? How then do I do these shapes that are very common. -Thanks - Olga- Attachments:

 From: Michael Gibson 23 Jul 2008  (2 of 13)
 1807.2 In reply to 1807.1 Hi Olga, maybe I don't quite understand, but I did not seem to have any problems filleting the first one that I tried: That was with a radius of 0.5. Often times it is surprising how much area a fillet will take up, so it can be a good idea to keep going to a smaller radius value to see what will fit. It's ok if the edges are broken up in multiple pieces, just select all of them. The ring that is up above will probably be difficult to fillet except maybe with a very small radius, because it has a tight bend in the surface. A fillet needs space to move a constant distance away from an edge. If you have a tight bend in the edge or the surface, it can limit the radius of fillet that can be used. Otherwise it would cause the fillet to bunch up, here is an illustration of this problem: Just to make sure, have you seen some of Jesse's tutorials on making ring shapes? They may be helpful: http://moi3d.com/forum/index.php?webtag=MOI&msg=284.1 http://moi3d.com/forum/index.php?webtag=MOI&msg=510.5 http://moi3d.com/forum/index.php?webtag=MOI&msg=623.1 http://moi3d.com/forum/index.php?webtag=MOI&msg=556.1 http://moi3d.com/forum/index.php?webtag=MOI&msg=538.6 http://moi3d.com/forum/index.php?webtag=MOI&msg=536.1 Also a couple of others: http://moi3d.com/forum/index.php?webtag=MOI&msg=1175.3 http://moi3d.com/forum/index.php?webtag=MOI&msg=1175.5 - Michael Attachments:

 From: malvin 23 Jul 2008  (3 of 13)
 1807.3 In reply to 1807.2 Hi Michael I read all of the tutorials and practiced them. As to my file - that file ring has only that one edge that can fillet. Did you try the opposite side of the first ring and the other ring to the right? I cannot fillet their round opening for finger. Where is that tight bend in the ring up above? Thanks -Olga-

 From: manz 23 Jul 2008  (4 of 13)
 1807.4 In reply to 1807.1 Hi Olga, The second ring (I think the one mentioned by Micheal) will give you problems. When you have built that you have added corner points in the middle of the splines which can give problems when trying to create a smooth surface. So I have edited the control curves (keeping as close as possible to original with time available) and attached the model for you to compare. EDITED: 3 Aug 2009 by MANZ

 From: manz 23 Jul 2008  (5 of 13)
 1807.5 In reply to 1807.3 Hi Olga, >>Did you try the opposite side of the first ring As Micheal mentioned, you need to select all the edges that are broken, So select the model and then the first part of the edge: Then select the rest of that edge for filleting: You can then make fillet up to about 0.5 EDITED: 3 Aug 2009 by MANZ

 From: Michael Gibson 23 Jul 2008  (6 of 13)

 From: Michael Gibson 23 Jul 2008  (7 of 13)
 1807.7 In reply to 1807.6 Hi Olga, here is a bit more explanation on why a very sharp "cliff" is not so good with a scaling rail. A scaling rail is applied to a sweep and modifies it by stretching profiles out to meet the scaling rail profile, in this kind of manner: Original sweep, scaling rail off to the side. When scaling rail is applied, profiles will stretch out to meet the scaling rail: If your scaling rail has a very steep kind of "cliff" in it as compared to the rail, it will create this kind of situation: That's not good because there is like a whole range of areas where the scaling rail intersects the extended profile instead of just one single area. Even if it was sloped slightly less so that there was only one intersection for each profile to the scaling rail, it will still be doing large jumps in the distance to the scaling rail for just every tiny distance traveled along the path rail. That kind of large jumping is not good for a scaling rail method. Network uses a pretty different method to create the surface, it is probably going to work better for situation like this which is not good for a scaling rail. - Michael Attachments:

 From: malvin 23 Jul 2008  (8 of 13)
 1807.8 In reply to 1807.7 Hi Michael Thank you very much for all these detailed explanations. I am new to 3D drafting. I do AutoCAD without 3D so I fell I need to get a hold of the 3D drafting concept. How do you show surface control points like on ring_fillet8.jpg? First I click on the 3d surface and than on “Show pts”? This does not work for me – am I missing something? What is Network? All these problem areas effecting fillet – are they going to effect other manipulations of the surface such of Booleans, sweeps? Please see the attachment. How do I make the bottom point of one rail meet the other rail (right view). I do not have stretch like in ACAD. If I use the control point – in is not on the rail – it is off the rail – so snap will not work. Scale will scale will the whole rail. The only way I see is to explode/trim the rail then I have a snap but I am loosing smoothness of the bottom part. -Thanks - Olga- Attachments:

 From: BurrMan 24 Jul 2008  (9 of 13)
 1807.9 In reply to 1807.8 Hi Olga, If you seperate then your points will show. You can "add point" on that rail in the center then use object snap. to keep the smoothness, also select the 2 points on either side of the first (they should be inline) this will keep the smoothness as you move the first point to snap on. see this in right view. Burr

 From: Michael Gibson 24 Jul 2008  (10 of 13)