How long do belt grinders last

With average use, that grinder should last decades. The wheels and bearings will be a wear item, but you’ll likely get years out of them first. I’d keep a spare drive belt on hand, though it’ll last you a while too. Switches and start caps go bad occasionally, but it’s anyone’s guess as to when. In short, I’d grind until something goes wrong, then fix it when it does. Those KMGs are about as simple as it gets.
 
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