Question

what is grinding stone

Answer 1

Hey mate here is your answer

A grindstone is a round sharpening stone used for grinding or sharpening ferrous tools. Grindstone machines usually have pedals for speeding up and slowing down the stone to control the sharpening process.

Hope this answer will help you!!

Answer 2

grinding stone is usually made from sands stone
grinding stone usually have pedal for slowing up and down
it is control process of sharpening
it is a round sharpening stone
also known as sharpening ferrous tool
the earliest known as representation a
rotary grinding stone operated by crank handle is found in Carolingian manuscript Utrechtpsalter