Reddit mentions of 3/4" Alpha Dry Diamond Core Bit

So I'm not a machinist, just a lurker here but this is something I know about so I'll give my 2 cents. I sold these for several years and this is by far the best bit for drilling granite it's a dry bit and will work just fine that way or you can use water. It's designed for angle grinder use so it's good up to 12K rpm, and honestly the faster the better. The Alpha rep told me this, helps you get through the piece faster and keep the bit cool. Now it's designed for 1-1/4" countertops so maybe give it a cool off period after an 1" or so on your 3" surface plate, water will also help keep it cool. Feed pressure will be minimal as well as pushing too hard will glaze the diamonds and temper the matrix they are suspended in, they are designed to slough off and reveal the next layer of diamonds so getting it too hot will prevent that. It's 5/8-11 so you will need an adapter of some sort no doubt. Don't know if this helps or not.