Cutting by use of rotating axially moving tool – Processes – Bit detachable
Patent
1991-10-15
1992-10-06
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Processes
Bit detachable
36447417, 408 3, 408 37, 408 59, B23B 3500, B23B 4100
Patent
active
051526417
ABSTRACT:
A method and apparatus for controlling glass drilling in which the starting position for the drill bit is calibrated prior to drilling. The drill bit is initially spaced close to the surface to be drilled and the rotating bit is slowly advanced toward the surface while a cooling fluid is discharged through an axial passage through the bit. Contact between the bit and the surface is determined by sensing either an increase in the fluid back pressure or a decrease in the fluid flow rate. The determined bit position is stored and used as a starting position when subsequently drilling holes. The starting position may be modified for subsequent workpieces to compensate for bit wear.
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Overmyer Michael S.
Peitz, Jr. Thomas A.
Howell Daniel W.
Royal Tool, Inc.
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