Drill break-through sensor

Details Drill break-through sensor Drill break-through sensor

1980-02-19

1982-01-12

Briggs, William R.

Cutting by use of rotating axially moving tool

With control means energized in response to activator...

To control infeed

408 8, 408 10, 408 14, B23B 4718

Patent

active

043102697

ABSTRACT:
An improved power drill having means for sensing when the drill bit has penetrated through the workpiece and for then retracting the drill bit from the workpiece. An electrical signal responsive to the axial force between the drill and the drill bit is used to sense when the drill bit pierces the workpiece. A sudden decrease in the axial force triggers a mechanism for retracting the drill bit from the workpiece. Means are included to detect broken bits, missing bits and previously drilled holes.

REFERENCES:
patent: 2857789 (1958-10-01), Robinson
patent: 2978689 (1961-04-01), Tech et al.
patent: 3051023 (1962-08-01), Hirsch
patent: 3241402 (1966-03-01), Crowell et al.
patent: 3259023 (1966-07-01), Rieger et al.
patent: 3471662 (1969-10-01), Berchtold
patent: 3515100 (1970-06-01), Keller
patent: 3973858 (1976-08-01), Poisson et al.

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