The smaller grinder will take a 6 wheel while the larger one can handle an 8. Since they both work great, Im considering picking up a narrow wheel to use for grinding moulding plane irons. I was taken by this idea when I saw Larry Williams use a 1/4 wheel to grind the profile for his hollow planes.
primitive antique hand crank grinding wheel with old paint. This bench grinder is from an old farm shop measures about 8quot; high and 3... antique french industrial meter, steampunk vintage measuring tool w/brass gears amp; porcelain dial Large antique mechanical measuring meter with an open escapement porcelain dial.
Wheel grinders: These are large cast iron coffee grinders that were initially designed as a store floor model in the 1870s, and have two grinding wheels. Models with single wheels were patented a few years earlier. Both types are highly collectible due to their age and appealing aesthetic.
Traditional grinding of scythes, knives etc in my corner of the world used to be a sandstone wheel 2 3 feet in diameter hand cranked and running in a through of water. Since you do not want it to throw water all over the place the RPM will be fairly low so even if it were motorized there is no risk that it will fail.