Problem with sketch patterns

[HughesTooling]

Someone in the CAM forum was having some problems with some circular slots. I traced it back to a circular pattern, in the example below I have one slot drawn, closed and constrained. The copies are all open. Also shows a problem with the constraint highlighting as as far as I can tell the first slot is fully constrained. File attached without pattern.

Mark.

Edit. Here's the link to the CAM forum thread. if you open the file in post #5 go to the model workspace and run compute all the slots disappear.

[jeff_strater · Accepted solution]

Hi @HughesTooling.  Yep, that's a bug.  Thanks for bringing it to our attention.

The problem is not in the pattern per se, it's in the slot that is the source.  This geometry does not have points properly "merged".  There are two points on top of each other here:

I'm going to guess here that the end point arcs of the slot were created by Center Point Arc.  This command has a bug where this point merging does not work correctly.  Even though you have added coincident constraints, the points are still not merged and they should be.  We are in the middle of fixing this bug.

However, even without that bug fix, this should work, I believe.  I will file that bug and get it looked at.

Also, Fusion really needs an "arc slot", or even a general "slot from curve", so you can have a slot from a spline.

There is a workaround, although it is ugly.  Here is a screencast:

Jeff Strater (Fusion development)

[HughesTooling]

I managed to get the slots to work OK using your technique but for some reason the CAM slot operation will not work on slots made that way. I found the only way to make the slots usable was to use complete circles at the ends, like this. I don't know if this is something for the CAM team or the Design team.

I've attached a file with 2 components comp2 the blue one has all the arcs trimmed the red one in like my picture above.

The problem with the blue one is one of the lead ins goes through the job.

The red one works fine!

Mark.