Not sure if this is a bug or intended but all of tinker's custom tools get destroyed by crushing wheels without returning any material whatsoever. Encountered while playing survival and flipping the wrong lever while on the conveyor belt, resulting in entire inventory getting ground up.

Not a bug, crushing wheels simply destroy everything they don't have a valid recipe for

Thanks for the report, but Spotty is correct. This is intended behavior, so I'm going to close this issue.