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US 4,587,763 AGranted
Grinding machine
OwnerRobert S. Hahninventor
Life of this patent
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Abstract
Grinding machine having a plurality of wheelheads for simultaneously grinding internal and external surfaces of revolution on a large workpiece, the machine including a temperature-controlled reference plate.
Claims6
Grinding machine, comprising:
- (a) a base on which is mounted a rotatable table for carrying a workpiece having a surface of revolution to be finished,
- (b) a wheelhead mounted on the base and carrying a rotatable abrasive wheel for finishing the surface of revolution,
- (c) a dresser mounted on the base for receiving the operative surface of the abrasive wheel;
- (d) a reference plate mounted on the table but thermally isolated therefrom by means of insulating pads extending between the reference plate and the table, the plate having a cylindrical contact surface which is coaxial with the axis of rotation of the table, and
- (e) means mounted at the base supplying constant temperature fluid through passages in the reference plate to maintain its temperature at a uniform value and to minimize expansion and contraction.
2 more elements
Dependencies are inferred from the claim text.