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Faunsdale, AL | I don’t know about JD, but Fox used a stone like that on their “Auto-Bev” knife grinder. There was both an electric manual one and the automatic one. The grinder had a 1 hp motor with an extended threaded shaft for an arbor to hold the stone. That was a simple cylindrical abrasive about 4” in diameter maybe 3/4” thick and bonded to a flat steel disk with a hole in the center for mounting to the motor shaft.
Fox always used a long heavy spiral knife and way back they had only a solid stone on a holder that you clamped on and spun the knives with the pto to grind the edges. As you moved it back and forth across the spinning knives, it would “joint” the knife edges all to the same length so you could set the shear bar and get a clean chop. Problem was you soon took off the long bevel behind the edge of the knife. That had to be maintained with a side grinder. A short bevel tended to cause feeding problems.
The in-head electric grinders traveled across the knife cutting the edge and came back cutting the bevel. You had to keep moving from knife to knife to keep them all the close to the same length for setting the shear bar. The automatic one made a single pass on each knife before moving to the next one. It was hard enough to switch to the next knife with the manual version that I think everyone just sharpened a knife until it looked sharp and then moved to the next. Not a system for keeping all of them sharpened to exactly the same length for setting the shear bar. There was enough slop in the carriage of the grinder that it wasn’t capable of jointing the knives perfectly anyway.
I think they needed to have one of the old stones that you drug across with the knife drum spinning to joint them perfectly but the grinders required a change in the design of the knife drum enclosure and the old fixture wouldn’t clamp on.
Edited by ccjersey 6/25/2022 07:42
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??old JOHN DEERE SIDE grinding type of grindstone stone use
