Re: Sharpen a carbide tipped saw blade?
In the eighties, when I got hired by the oak furniture company to run their giant, then state-of-the-art CNC router, because I had a certificate in computer programming—I would box up half a dozen of the half inch shaft router bits or shaper cutters, and drop the box at the Greyhound bus station, to go to the sharpening business in the next town down the freeway, on my way home from work, and pick up a box with freshly sharpened carbide tips on the way back into work one morning later in the week.
Sometimes, the cutters, spinning at eighteen thousand rpm would hit a bit of grit or some hard part of a knot, and chip a tip, or blow a carbide tip completely off. Usually, the used carbide tips would just be too thin to grind again and a set of new ones would be welded on. We had enough volume of work, the CNC router was churning out various parts by the pallet, two shifts per weekday and Saturdays, and we'd been sending the cutters out about once a week. So the manager owners bought a Foley Belsaw sharpening station specifically for the carbide tips of the router and blades from the various saws in the factory, and hired a new guy with the right skill set to run it full time.
The point is that, with enough motivation and time and whatever, a woodworker going through enough carbide tipped saw blades to matter, could conceivably build a robust jig to grind the carbide. It needs to be able to rotate the blade step-wise to position the next tooth under the grinder face, apply just the right pressure for just the right amount of grind, and make each of the twenty or forty or sixty tips the same thickness when sharp, so all the teeth are the same size and height above each gullet. The grinding face, of course, has to be just the right 'grit' to work the extremely hard carbide smoothly to leave a perfect edge. An old saw, like a miter or chop saw, could be set up that way.
It would be worth doing with enough volume of work. Enough volume would mean an operating revenue sufficient to afford a Foley Belsaw sharpening station.
Then you could quit woodworking to run a carbide sharpening business out of the shed.
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