Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1982-03-10
1984-10-09
Whitehead, Harold D.
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
5116572, 51219R, 364474, B24B 100
Patent
active
044753209
DESCRIPTION:
BRIEF SUMMARY
INTRODUCTION
The present invention relates to an improved method and apparatus for grinding step drills and, more particularly, to a method and apparatus for regrinding step drills utilizing a laser optical microscope sensing system.
BACKGROUND OF THE INVENTION
Heretofore the method of grinding step drills included a ninety percent manual operation wherein fourteen steps in the grinding operation of one step drill were utilized.
In contrast, the present step drill pilot diameter sensing system utilized in regrinding step drills reduces the method to three steps.
DESCRIPTION OF THE PRIOR ART
The prior art patent literature includes U.S. Pat. No. 4,176,396 which teaches the use of a tool water measuring device and control apparatus in which a microprocessor responds to cutting tool profile related signals for manipulating same and providing a digital readout of the tool wear signals and/or supply to the machine tool processor.
BRIEF SUMMARY OF THE INVENTION
In contrast, in accordance with a preferred embodiment of the present method, a three step method includes: and switching a measuring switch to the ON position; and, workhead activating the grinder.
A full understanding of the invention, and of its further objects and advantages and the several unique aspects thereof, will be had from the following description when taken in conjunction with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWING
The sole FIGURE is a block diagram and partial schematic of the present control system and grinder for measuring the pilot diameter and operating a stepper motor which produces the required motion necessary for adjusting the machine workhead stop in the semi-automatic grinding cycle.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Briefly, the present system provides a new step drill bit grinding process utilizing a modified drill bit pointer e.g. a Winslow Company Type 100-C. The present system, as seen briefly in the block diagram of the FIGURE, includes a laser optical microscope (termed lasermike), a digital readout, a microprocessor, and a stepper motor geared to the workhead stop of the machine. Control over the amounts to be removed from the drill bit is controlled by the microprocessor and not left up to the operator. The operator is merely required to place the step drill bit through the laser beam by utilizing a fixture mounted on the lasermike, thus measuring the pilot diameter which information is coupled to the microprocessor through the digital readout. The microprocessor controls the functions of receiving the signal and analyzing the data from the lasermike and amplifying the signal.
The signal is converted to motion through the power pack and coupled to a stepper motor which produces the required motion to adjust the machine workhead stop. The aforementioned steps require seconds to accomplish; the operator subsequently removes the drill bit from the lasermike station, places it in the workhead of the machine and starts the grinding cycle. During the grinding cycle, the operator places another drill bit in the lasermike station for the next sequence. The microprocessor stores the information until released for the subsequent grinding cycle. As hereinbefore mentioned, the present system, as shown in the FIGURE, includes only three steps in the grinding operation. The modified grinding machine is capable of regrinding step drill at a rate of about 300 per hour and further extending the drill life from four to seven regrinds.
Step drill 8 is positioned in laser optical microscope 10 (e.g. a Model 50, Techmet Co.) and then rotated 360 degrees. The laser optical microscope 10 measures the pilot diameter of step drill 8, remembering only the largest diameter and displaying this value on laser optical microscope readout 12. The data is then transmitted to microprocessor 14 (e.g. Techmet Co. Model No. 82). Microprocessor 14 is pre-programmed to perform various functions but also can be adjusted manually by turning star thumbwheels to desired settings for the various sizes of step drills 8 and
REFERENCES:
patent: 2564496 (1951-08-01), Murray
patent: 2931917 (1960-04-01), Beclitz
patent: 3040480 (1962-06-01), Winslow
patent: 3209493 (1965-10-01), Houser
patent: 3543445 (1970-12-01), Borchert
patent: 3851180 (1974-11-01), Kato
patent: 3947129 (1976-03-01), Wiklund
patent: 4005552 (1977-02-01), Hoglund
patent: 4167082 (1979-09-01), Kolb
patent: 4176396 (1979-11-01), Howatt
patent: 4228514 (1980-10-01), Weiss
patent: 4260986 (1981-04-01), Kobayashi
DeVogel Nicolaas
Donahue Bernard A.
Gardner Conrad O.
The Boeing Company
Whitehead Harold D.
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