Abstract: A multimodal cycle for a grinding machine is modified as the function of the grinding force and the mode of operation. The grinding force is monitored by measuring the electrical load value upon the grinding wheel motor during operating conditions and biasing this value by a stored value representative of the nongrinding idle load. The idle load bias is updated with each grinding cycle and the grinding force signal is used to control a variety of machine operations. If the grinding force signal exceeds a predetermined threshold during an early portion of the grinding cycle, the wheelhead advancement is terminated; while the same situation in a later portion of the cycle permits continued wheelhead advancement but at a reduced rate. The grinding force signal is also used to count parts and detect part absence. It is further used to regulate rough and finished spark-outs as well as a peak load limit for the grinding cycle.

Abstract: An apparatus is provided for moving a machine element along a straight line path in a plane defined by two orthogonal axes of motion. A switching device is provided for producing an input signal representing the slope of the straight line path which is defined by the tangent of the angle formed between the path and a first axis of motion. In accordance with mechanisms known in the prior art, first output pulses are generated for moving the machine element along the first axis of motion at an arbitrary velocity. The invention provides a counter circuit having a modulus as a function of the component of slope along the first axis of motion. Further in response to the input signal and each of the first output pulses, the counter circuit increments a number of times represented by the component of slope along the second axis of motion.

Abstract: A machine tool having an electrical means for producing a non-cylindrical surface of revolution.