Keep a Hole Saw From Seizing
Adding a soft copper spacer between a non-quick-release hole saw and its arbor so the two never gall together.
Resharpen a Glazed Diamond Blade by Dressing It Against Another Blade
A diamond blade that's cutting slower isn't necessarily worn out — running it against a dressing stone for 10 seconds strips the glazed surface and exposes fresh diamond.
angle grinder blade won't cut, tile saw blade worn out, blade just rubs instead of cutting
The Problem
A diamond blade that's cutting slower than it used to isn't necessarily dull or worn out. The diamond segments can get "glazed" — coated with a smooth layer of ground material, especially from cutting tile — which keeps fresh diamond grit from ever reaching what you're cutting. Buying a replacement blade skips right past a much cheaper fix.
The Technique
- Get a dressing stone — an abrasive block made for exactly this — or, in a pinch, another old abrasive blade.
- Run the glazed blade against the dressing stone (or the other blade) for about 10 seconds, the same way you'd run it through a normal cut.
- The abrasive action grinds away the glazed surface layer and exposes fresh diamond underneath.
- Test the blade on a scrap piece — it should bite and cut like new.
Pro tip: Do this at the first sign of slower cutting rather than waiting until the blade seems fully dull. Caught early, a glazed blade dresses back to full sharpness in seconds; let it go too long and you're better off just replacing it.
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