Filleting a sketch causes a previously fully constrained sketch to become unconstrained

Gary_32

The sketch was fully constrained and showing as all black.

Then I added 0.5mm fillets to all the intersections

Then the sketch became unconstrained and showed red

It seems to me that the fillets have broken the pattern constraint that I used to create the cut-outs in the sketch?

I presume that the fillet has removed a bit of the end of a line that was used as a length constraint in the pattern - but surely it should just use a virtual intersection point if a fillet is applied to an intersection of two lines?

Surely this should not happen?

Further, how do I go about fixing the broken pattern constraint - can I adjust the points/line that the constraint was originally patterned with?

Narayan_K

Red color shows that sketch was over constrained.make it undo and reapply fillet by selecting two lines instead of selecting corner point.It may solve your problem.
Even if you apply fillet by corner point selection method it should not over constrain the sketch...It may having some problem...

brucebartlett

You can also turn on the checkbox "Show Constraints" on the sketch dialogue to show all the constraints. Then delete start to delete the problems one to find the issue.

paul_chastell

@Gary_32, if you report to Support as a bug then we can dig into it. The intention is that filleting should never over-constrain a sketch. Constraints to the original point should move to the virtual sharp, etc. Maybe that isn't happening in this case, maybe the new set of constraints is causing problems, hard to say without the data set. What I can say is that this is not expected behavior.

Gary_32

Thanks all - I did log a call about it at the same time as posting as it looked like a bug. I needed to get on though, so I reverted to an earlier version before the fillets then tried again with a slightly larger radius and this time it worked OK. 

paul_chastell

That's good news. We'll take a look anyway though: should work out why your first attempt was unsuccessful.