ROBERT S HAHN
Engineering in Oakham, MA
License number
Massachusetts 5535
Issued Date
Apr 29, 1949
Expiration Date
Jun 30, 2006
Type
Mechanical Engineer
Address
Address
Oakham, MA 01068
Professional information
Sensors For Internal Grinding Machines
US Patent:
5782674, Jul 21, 1998
Filed:
May 20, 1997
Appl. No.:
8/859153
Inventors:
Robert S. Hahn - Oakham MA
International Classification:
B24B 4900
US Classification:
451 9
Abstract:
A grinding machine for grinding an internal cylindrical surface of a workpiece in which the workpiece is moved toward a grinding wheel along the axis of revolution of the workpiece and the grinding wheel is moved transversely of the axis of revolution toward the cylindrical surface of the workpiece. The grinding wheel is mounted on a supporting structure which is mounted for pivoting about an axis which is transverse to the axis of revolution. A deflective stiffening element restrains the angular displacement of the supporting structure. The deflection of the stiffening element is proportional to the deflection of the spindle. The deflection of the stiffening element is measured by a sensor which transmits an electrical signal to a drive mechanism for angularly positioning the supporting structure in response to the signal to compensate for the deflection of the spindle. A ring-shaped workpiece is supported on the workhead by a magnetic face plate. The outer surface of the ring is engaged by a pair of shoes to establish a workpiece axis of revolution which is offset from the axis of revolution of the wheelhead.