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Browse Prior Art Database

Drill Bit Tester

IP.com Disclosure Number: IPCOM000047551D
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Chen, PC: AUTHOR [+2]

Abstract

Drill bits, particularly those of the cemented type, can be tested for integrity by placing the bit in a chuck and imposing a transverse loading on the bit while it rotates. This stress will detect those bits having voids or cracks causing them to fracture. Referring to the figure, a drill bit 1 is inserted in chuck 2 which is rotated by drive motor 3. An arm 4 pivoted at 5 has a blade 6 formed thereon to engage the side of the drill 1. Arm 4 is engaged or disengaged with the drill by means of screw 7 and motor 8. The arm may also be equipped with a strain gauge 9 that can provide an indication of the applied force and be used to control the arm motor 8.

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Drill Bit Tester

Drill bits, particularly those of the cemented type, can be tested for integrity by placing the bit in a chuck and imposing a transverse loading on the bit while it rotates. This stress will detect those bits having voids or cracks causing them to fracture. Referring to the figure, a drill bit 1 is inserted in chuck 2 which is rotated by drive motor 3. An arm 4 pivoted at 5 has a blade 6 formed thereon to engage the side of the drill 1. Arm 4 is engaged or disengaged with the drill by means of screw 7 and motor 8. The arm may also be equipped with a strain gauge 9 that can provide an indication of the applied force and be used to control the arm motor 8. By successively inserting a series of drills and applying to each a predetermined force, those drills having cracks or voids can be eliminated, thus reducing the number of broken drills that must be removed later from a workpiece. To more closely simulate the actual drilling operation, a vibratory device can be mounted on the arm 4 for concurrent and supplemental loading with the applied normal force.

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