I recently purchased a jet dust collector which is 230v motor 15amps. However, its plug is the regular 3 prong plug. In my garage, I have a separate 250v outlet with 20amps circuit breaker but it has the lockturn outlet. Is there a way to convert this 3 prong plug to the turnlock using an adapter? or should I cut the 3 prongs and install turnlock plug? Thank you
However, its plug is the regular 3 prong plug
Well, it's a regular NEMA 6-15 plug, which is a bit of an oddity. Here's the whole lineup.
Notice that the 6-20 has a T-shape so it is downward compatible with the 6-15. (you probably know NEMA 5-20s do the same).
So you are perfectly welcome to replace that with a simplex (1-socket) or duplex NEMA 6-20.
You cannot install a simplex NEMA 6-15 for the reasons covered in this answer here. But a duplex 6-15 is fine.