Error when adding chamfer or fillet at the start of a threaded hole

Cedric_Eveleigh

Has anyone else experienced an error when attempting to add a chamfer or fillet at the start of a threaded hole? (the thread being subtractively added, and the chamfer or fillet being added before sweeping the thread)

john_mcclary

is your chamfer before the sketch that defines the helix also? that could cause a relation issue.

does the chamfer work if you roll back to it? (basically, is the chamfer failing or is the thread failing?)

Cedric_Eveleigh

The helix is not defined by a sketch - it's defined by the cylindrical surface of the hole. The chamfer does work if I roll back to cancel the thread sweep. Both the chamfer and the thread work alone. The chamfer appears to be causing the thread sweep to fail.

john_mcclary

You say the sweep is subtractivly added, I assume you mean you are sweeping a new part, then boolean subtracting it right?

if not, try that as an experiment. see if that helps

Cedric_Eveleigh

By subtractively added, I mean that the sweep is in "Remove" mode, rather than "Add" mode in the sweep dialog.

I just tried sweeping the thread as a new part and then boolean subtracting it, and there was still an error.

Cedric_Eveleigh

If I slightly increase the size of the hole ("Hole trim" in the screenshot below) after creating the helix and before subtractively sweeping the thread, the sweep does not fail because of a chamfer created before the sweep. This work around is fine for me but it still seems like the issue should not occur.