Fusion 360 not obeying feed optimization parameters

[epalmerANXTH]

 I am making a part with rectangular pockets with .098 in corner radius.  The endmill we are using is a custom endmill with a chamfer on the top and a .098 diameter cutter tip.  Due to the small tip diameter we are using, I am using feed  optimization to slow the cutter down on the inside corners.  However after breaking 2 $150 endmills I noticed that Fusion is not slowing down the cutter in the inside corners properly.  It  only is slowing down on outside corners even though the "Only inside corners  boxed is checked".   It is also ignoring the reduced feed distance.  If I uncheck "only inside corners it works correctly.   But then I need to machine outside corners at a very low feed rate.  I have 200 parts to make with 45 plus corners each, so I need to minimize the machining time.  Can this issue be confirmed as a bug or am I just doing something wrong?    

[engineguy]

@epalmerANXTH 

It is working correctly and as expected here 🙂 🙂

When you "check" the "inner corners only" you are instructing Fusion to do ONLY the inside corners and nothing else, having it "checked" will not allow the reduced feed before the corner to be generated so it must remain unchecked to work correctly. Just a matter of terminology, it isn`t about doing either the inner or outer corners, easy mistake to make 🙂

To stop Fusion from doing the reduced feedrate before and during the outer arcs you need to put a value that is equal to or less than the sum of of the smallest outer arc plus the radius of the tool, see the attached file and play with the numbers or use your own file 🙂 🙂

Stay Safe

Regards

Rob