I went to an yardsale/estate sale in Lunenburgs old foundry and found this little 1/2hp gem. (Click for Video) I love stuff like this, taking them apart using what I can,reverse engineering so to speak. I was told it was set on rails , it has bearing underneath which rolled on said rails. Operated by a hand cranked on a gear which drives the chain, which in turn moves the motor and grinding wheel back and forth. It was used for sharpening large mower blades. For 20 bucks, Ha, it was worth that just to see in work. I may keep it or take whats useful off it and scarp the rest. Anyway just thought you guys might like it. If anyone has seen one or used or know more about it, post away.