when are grinder teeth junk?

[MOE]

I'm new to stump grinding; I just bought a used grinder with a lot of used teeth. I'm going to sort through them. Many are chipped and have chunks of carbide missing. They are a mixture of green teeth and other types,(no super teeth). Should I save the chipped ones? Can they be retipped? How about the insanly dull ones? The dull ones I'm going to try to sharpen and keep using. Thanks

 

[Stumper]

Yes they can be retipped. Chips don't necessarily matter-it depends-if half the carbide is gone scrap it -it there is just a chip misssing and you have lots of normal edge-run it. For sharpening I highly recommend a diamond wheel-I messed around with the dusty , filthy, hazardous Greenwheels for over a decade-The diamond wheels are absolutely , unequivocally worth the investment.

 

[MOE]

Where is a source for diamond wheels? Does anyone make one for an angle grinder? I have not sharpened teeth yet but it looks convenient to sharpen them right on the machine with an angle grinder.