In article s.com,
buck wrote:
I see where router speed controls sell in the $25-$50 range and supposedly
they will work with most routers that aren't soft start or already have
variable speed. My question is what is chance of this working with a $40 6
inch non-variable speed bench Home Depot Ryobi grinder.... I would like to
use this grinder to sharpen lathe chisels and I need a slower speed grinder
for this.
-TIA



They won't work with an induction motor, which most grinders have.

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Larry Wasserman Baltimore, Maryland