Join Thom Tremblay for an in-depth discussion in this video Fillets, part of Fusion 360: Designing for Plastics.
- [Instructor] Fillets are a common feature on any type of molded part whether it's plastic or metal. Fusion 360 can fillet edges and can also use another approach for breaking sharp edges that's much more intelligent. I have all the draft that I need. Now I need to break some of these sharp edges, especially the internal ones. I'll start out by using the basic fillet tool from the modify pull down, which has a keyboard shortcut of F. Then, I'll select the internal edges for the frame and the edge at the base of the frame.
Set the radius to one and apply that as one feature. The other edge fillet that I'd like to place is on the outside on the A side of the part. I'll start the fillet tool, grab these sharp edges, and set the radius to two. As long as I'm on the A side of the part, there's another type of place feature I'd like to include called the chamfer. I'll start the chamfer tool, selecting the edges of the holes for the buttons, and the outside edge of the panel opening, setting the equal distance value to 0.5.
Now I'd like to start another tool called rule fillet that uses a little more intelligence to select the edges that will be filleted. I'll use this for the boss and the ribs. The rule fillet is also found under modify but it works differently. Instead of selecting a lot of edges, I can select the features such as the draft around these bosses and the rib, as well as the patterns and say that any edges that are on those features that come in contact against the thicken feature will have a radius of one applied to them.
So it automatically selects the edges and calculates the fillet. I'll click OK to place this rule fillet and move on to the most complex set, the grill. I need to make sure that all of the internal edges have a radius applied to them. I'll start the rule fillet tool again. This time, I'll set the features to be the draft that was applied to the grill and instead of saying against features, I'll change the scope option to all edges and set the topology option to all fillets.
So this will make it so we're only adding geometry to internal corners. It will give me an error, letting me know that the last value I used on the fillet, which was one millimeter, will not work, which is fine. I'll change the value to 0.3 and click OK to generate all of the fillets on that grill in one step. In addition to making it easy to add all of these fillets, rule fillets can create a condition that will allow additional edges to be added to the fillet automatically if the controlling features change.