when heads are serviced for new gaskets or other problems this is one of the thing that they can do to help the valve seat or close as designed
typical service done to a head as part of renewing it for service after replacement for better performance or like new before it is reinstalled .
NO In the old days we sed to do this and a proccess called "Lapping" to get a perfect seal between the Valve and seat. Today with special coatings and special materials used in in valves and valve seats any grinding process can seriously damage the valves and seats.
The valve clearance is set by grinding the faces if there is too much clearance or grinding the tip of the stem if there is too little. If it is a OHV engine you can easily adjust the valves. Try going to the link below for a video that shows how to adjust the valves.
It means grinding to a powder or dust
If you are not sure, and do not have the tool's, it would be best to take the head and valves to a shop to have it done. Believe me, if the valves are not ground to the specific degree, and angle, all your work will be for nothing, and the engine will not run.
One of the major valves of the heart.
The definition of whet is: to sharpen (a knife, tool, etc.) by grinding or friction or to make keen or eager; stimulate
This is a procedure done to restore the valves and valve seats. This is done typically when having a head(s) reconditioned.
By definition, time cannot end. It just keeps grinding along.
Surface grinding is a technical term referring to the production of flat, contoured and irregular surfaces on a piece of work which is passed against a revolving grinding wheel.
any device that can penetrate a earthly matter in a grinding, pulsating, or drilling motion.
A large stone carved in the shape of a wheel for sharpening axes and knives or for grinding grains.
A powder obtained by grinding grain, typically wheat, and used to make bread, cakes, and pastry.