I'm not quite clear on the question. Are you looking for a grinding machine such as a surface grinder to form/sharpen the various thread profiles on carbide threading inserts/carbide threading tool bits, (Acme threads, British Acme threads, Whitworth threads, Metric threads, Unified threads, etc.) in automated (production) or manual (resharpening existing carbide threading tools????
If your question is touching up (offhand grinding) of a carbide threading tool, I believe the following will answer your question. Generally, indexable threading inserts are not sharpened, but merely indexed to the next unused cutting edge and discarded when all of the worn or chipped surfaces have been used.
If touching up brazed cemented carbide tool bits (known as "offhand grinding"~~to distinguish it from "machine grinding") a small electric sharpening machine, which is basically an electric motor with a green silicone carbide "roughing" wheel on one side of the motor and a diamond "finishing" wheel on the other side of the motor. The threading tool is supported by a rest or table, which allows the tool to traverse across the face of the sharpening wheel, and provide the required clearance angles to be ground into the tool. A cutting fluid/coolant (generally kerosine in my experience) should always be used with the diamond wheel. Generally, not more than .005/.010 inch of carbide should be removed in the sharpening process, and NEVER sharpen high speed tool bits on the diamond wheel.
Almost all of these grinders of this type that I have seen were manufactured under the name of Baldor(e) and cost wise probably under $1000.
If your question is referring to a "production capacity" grinder, if other responses do not answer your question, you might call around to some machinery sales businesses and they could lead you to the answer you seek.
Special Grinding Machine
Re: Special Grinding Machine
