Patent ID: 7507145

Claim:
A system for grinding an object to a depth, the system comprising, a grinder for grinding, an object being ground by the grinder to the depth, a device having a device material with a marker material disposed therein, the device having a bottom surface and having a top surface, the grinder for grinding the top surface into a ground top surface, the marker material being disposed between the ground top surface and the bottom surface during the grinding, the marker material of the device being colocated in depth, the device being juxtaposed to the object, the marker material being exposed in part as a marker on a ground top surface of the device as the device material is ground while the object is being ground, the exposed portion of the marker material being the marker, the exposed portion of the marker being visible on the ground top surface, the bottom surface and the marker material being separated in distance by the device material for defining a relationship for indicating the depth of grinding, the relationship being between a marker position of the exposed portion of the marker material for indicating the depth of the grinding, the marker position on the ground top surface moving across the ground top surface of the device as the device material and the marker material and object are concurrently ground by the grinder, the movement of the marker across the ground top surface of the device as the device and object are being ground defining the relationship between the depth of the grinding and the position of the marker on the ground top surface, and a fixture for rigidly securing the device and object in the colocated and juxtaposed positions during grinding.