How do I wire a 380v/3 phase bench grinder to run on 220v single phase
How do I wire a 380v/3 phase bench grinder to run on 220v single phase

You don't.

A device designed to run from three separate phases, each 120&deg; apart, is unlikely to work with a single phase.  Even if it is possible at all, trying to "convert" it would require intimate knowledge of the device and expert-level electrical engineering skills.  The nature of your question implies you have neither.