Drill Bit Tester
Original Publication Date: 1983-Dec-01
Included in the Prior Art Database: 2005-Feb-07
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.