Non-turning uses for a lathe:

Variable speed power buffing. My friend comes over to polish the
aluminum trim for the car he's restoring.

Variable speed disk sander.

Variable speed drum sander.

Adjustable holder for building model rockets.

Making plugs and stoppers for various items around the house (drilled
holes, pipe ends, etc).

Winding thread/wire/ribbon onto spools.

Spending time teaching your kids to use it.