SYSTEM FOR RETURNING A MAIN AXIS BACK TO ORIGIN

摘要

A system for returning a main axis back to a preset mechanical origin. A spindle amplifier (20) rotates a main axis motor (30) upon receipt of a return-to-origin instruction from a numerical controller (10), and positions the main axis motor at a mechanical origin separated by a predetermined distance away from the point upon receipt of a turn signal (Pi) from a position detector (36). Therefore, if a rotational distance is given from a point where the turn signal (Pi) is produced to the mechanical origin, the operation for returning the main axis back to the origin can all be carried out by the spindle amplifier (20) simply in response the return-to-origin instruction sent from the numerical controller (10).