Abstract: The testing of a cutting-edge geometry of a tool takes place during time intervals that comprise time instants at which it is to be expected that a region, to be tested, of the tool enters a measuring beam. At time instants at which the tool does not enter the measuring beam, no measurements are performed, which increases the reliability of the test and avoids spurious measurements. For this purpose, a measuring system is used that preferably comprises programmable units in order to use the invention flexibly for various machine tools and tools without changing the construction of the measuring system.
Abstract: The measuring instrument comprises a retaining fixture adapted to hold an object to be measured in a center plane of the measuring instrument, defined by a guide, in such a position that a dimension of interest will extend parallel to the guide. A carriage supporting a transmitter and a receiver, respectively, at either side of the center plane for an energy beam focused on the center plane is movable along the guide. A distance measuring device provided to measure movements of the carriage along the guide comprises a rule member which is disposed in the center plane. The dimension of interest is determined based on positions of the carriage at which the energy beam, first received by the receiver, is interrupted by the object to be measured and then again received.