"robobass" wrote in message
...
I keep a pair of grinders on my balcony. They are protected from rain,
and get used at least twice a week for long enough to warm thoroughly.
Should I bring them inside when it will freeze overnight?

I can't think of any reason to keep them from freezing, as long as they're
protected from moisture.

The biggest problem with bringing them in from the cold is that you're
inviting condensation on the tools, including inside parts that are exposed
through cooling vents, etc. That could kill them in short order.

--
Ed Huntress