topic Re: Blend fails with negative offset? in Fusion Manufacture Forum

Blend fails with negative offset?

HughesTooling — Mon, 14 Jul 2025 14:34:13 GMT

Trying to setup a blend and kept getting a failure and found it failed because of the negative offset. Found I could get it to work if I changed the stepover calculation to on surface. Is this op expected to fail using the defaults and a negative offset? Test file attached.

Re: Blend fails with negative offset?

a.laasW8M6T — Wed, 16 Jul 2025 08:44:53 GMT

As a workaround you can use negative stock to leave in the avoid machine group instead of the Stock to leave in the passes tab:

(view in My Videos)

@oleg.tikhomirov May be able to better explain what's going on here

Re: Blend fails with negative offset?

oleg.tikhomirov — Wed, 16 Jul 2025 10:04:54 GMT

Hi @HughesTooling

Thank you for the feedback. I've created ticket CAM-64897 to investigate and fix the problem. Please use On Surface (should provide very similar toolpath for this example) or workaround suggested by @a.laasW8M6T.

@a.laasW8M6T Thanks for tagging me. I can't really say now why it doesn't work. I think you're right and it's a bug related to machine/avoid surface groups + negative stock to leaves.