Turning – Process of turning
Patent
1994-03-23
1996-06-18
Rachuba, Maurina T.
Turning
Process of turning
82 113, 82119, 82152, B23B 714, B23B 100, B23Q 3300
Patent
active
055267254
ABSTRACT:
The present invention provides a rapid indexing spindle drive and control apparatus for installation as a retrofit on a cam controlled automatic screw machine to provide the capabilities of variable spindle speed and direction as well as rapid indexing of the spindle in relation to the tool head of the screw machine for stationary tool operations. The apparatus includes a variable speed, low mass servo-motor mounted on the headstock of the machine and connected to the spindle by a 1:1 drive ratio timing belt and pulley system. A cam shaft revolution sensor is mounted adjacent to the screw machine cam shaft and is driven by the cam shaft through a second 1:1 drive ratio timing belt and pulley system. Electronically connected to the servo-motor and the cam shaft revolution sensor is a computer control system which includes a computer and an operator interface unit whereby cam shaft positions and spindle drive commands corresponding to specific cam shaft positions are entered by the machine operator. In operation, the computer receives signals constantly generated by the cam shaft revolution sensor and a resolver in the servo-motor which signals correspond to the rotational positions of the cam shaft and the servo-motor respectively. These signals are compared to the values entered from the operator interface unit and the appropriate spindle commands are issued by the computer at the same points for each revolution of the cam shaft.
REFERENCES:
patent: 4233359 (1981-03-01), Youden
patent: 4656897 (1987-04-01), von Niederhausern et al.
patent: 4992711 (1991-02-01), Sugita et al.
Rode Lawrence E.
Smith Alfred R.
Tremaglio Angelo F.
Tremaglio Caesar D.
Tremaglio Neil L.
Hansen Kenneth S.
Rachuba Maurina T.
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