Automatic grinding machine

摘要

A machine for grinding an object, such as a printed circuit board coupon, having a region to be exposed and having a novel control track that has at least a portion of the rear edge of the track precisely located with respect to a predetermined grinding depth for the region is provided according to this invention. The grinding machine includes means for engaging the object with an abrasive device and means, interconnected with the control track on the object, for disengaging the object and the abrasive device when a break in the track has been ground.