Method and apparatus for terminating the axial depth of a thread cutting operation
Abstract
Abstract IN A THREAD CUTING OPERATION, SUCH AS THE TAPING OF A BLIND HOLE, WHEREIN A TAP PERFORMS A NATURAL AXIAL FEED MOTION IN ACCORDANCE WITH ITS ANGULAR VELOCITY AND PITCH, A SECOND AXIAL FEED MOTION IS SUPERPOSED UPON THE NATURAL AXIAL FEED MOTION OF THE TAP, AT AN AXIAL SPEED DIFFERING BY A CONSTANT RATIO FROM THE NATURAL AXIAL SPEED OF THE TAP. THE DIFFERENCE BETWEEN THE TWO AXIAL TRAVELS IS COMPENSATED BY AN IDLE TRAVEL, AND THE AXIAL DEPTH OF THE TAPPING IS TERMINATED RESPONSIVE TO A PREDETERMINED VALUE OF THE SECOND AXIAL TRAVEL IN PROPORTION TO THE TWO AXIAL TRAVELS FROM ONE COMMON STARTING POINT. THE APPARATUS INCLUDES TWO DRIVES, ONE ROTATING A DRILL SPINDLE AND THE OTHER FEEDING THE DRILL SPINDLE MOUNTING AXIALLY, SO THAT BOTH THE DRILL SPINDLE AND ITS MOUNTING ARE DIRVEN SYNCHRONOUSLY IN A PREDETERMINED RELATIONSHIP, THERE BEING A TAP CHUCKED IN THE DRILL SPINDLE. THE TAP PERFORMS ITS OWN AXIAL FEED MOTION AGAINST THA BIAS OF A SPRING TO ACCOMMODATE THE ABOVE-MENTIONED IDLE TRAVEL.
Inventors
- 👤 Gerhard Stade
Bibliographic Details
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |