Machining appts. for car brake disc - uses radially displacing tool to remove material revolving disc variation disc speed obtaining constant cutting rate

摘要

The machining process is partic. used to finish the major faces of an automobile brake disc (1), and utilises a radially displacing cutting tool (41,42) to remove material from the revolving disc. A constant cutting speed is effected by varying radial disc velocity whilst variation in the rate of radial tool displacement effects a constant width of cutting. For constant cutting speed, a speed-regulator (14) may control the disc-motor (3), its feed voltage resulting from the division (12) of an adjustable prim voltage and a sec. voltage related to the radial tool position. The sec. voltage may be the algebraic sum of a cutting start voltage and a voltage which represents subsequent radial tool positions.