Interious wrote:
I've got a hunch this is probably a bad idea.
I bought a Milwaukee 5615 fixed speed router and I need to swing a
3/4" roundover bit (~18,000 rpm, according to Jesada). I'm wondering
if I should return this fixed version for the variable speed unit, or
if a 2kw variac will do the job?
Dave

You don't want to go there.

I could give you a long explaniation why, but it's late and I'm tired.
Sorry.

What I suggest is you consider something like a table mounted PC 7518.

A 3/4" rounding over bit is nothing to fool around with in a hand held
router, IMHO.

You are probably going to have to probably make multiple passes anyway,
so a table makes it a lot easier and safer.

HTH

Lew