US4475320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for regrinding step drills
Assignee: Boeing Co
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Filing: 1982-03-10
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Granted: 1984-10-09
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Expires: 2002-03-10
Abstract
Abstract A drill bit pointer machine includes a laser micrometer for measuring the pilot diameter and transmitting the data to a microprocessor through a digital readout. The microprocessor is programmed to manipulate the data and define the operation of a stepper motor which produces the required motion necessary for adjusting the machine workhead stop for utilization in the subsequently performed semi-automatic grinding cycle.
Inventors
- 👤 Frank R. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:07
CPC Classifications
B; B24; B24B; B24B3/00; B24B3/24; B24B3/242
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
In combination in a method for regrinding step drills, the steps including: positioning a step drill in a fixture associated with a laser optical microscope and switching to an ON condition a switch for indicating a diameter measuring process; rotating said step drill through 360° revolution and switching to an OFF condition said switch for initiating a measuring process; removing said step drill from said fixture associated with a laser optical microscope; and, then positioning said step drill in a workhead for activating a grinder adjusting a workshead stop in response to said diameter measuring to control said regrinding of said step drill.
Claim 2
Dependent Claim
103 words
In combination in a method for regrinding step drills, the steps including: positioning a step drill in a fixture associated with a laser optical microscope and switching to an ON condition a switch for indicating a diameter measuring process; rotating said step drill through 360° revolution and switching to an OFF condition said switch for initiating a measuring process; removing said step drill from said fixture associated with a laser optical microscope; and, then positioning said step drill in a workhead for activating a grinder adjusting a workshead stop in response to said diameter measuring to control said regrinding of said step drill.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |