Positive feed drill use counter

Details Positive feed drill use counter Positive feed drill use counter

1985-08-08

1987-10-27

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

With randomly-actuated stopping means

Responsive to condition of tool or tool-drive

408 11, 408 16, 408702, B23B 4900

Patent

active

047026502

ABSTRACT:
A positive feed drill assembly having an air powered motor and an automatic drill feed and retract mechanism with a normal feed, drill, and retract sequence of operation is provided with an improvement to control the number of times the drill can be used to make a hole with a particular cutter. The improvement includes an apparatus associated with the automatic feed and retract mechanism for sensing the cycle of each drilling operation. A counter functioning with the sensing apparatus counts the number of drilling operations. A comparator associated with the counter compares the accumulated number of drilling operations with a predetermined number. A signaling apparatus connected with the counter provides a signal to the operator when the drill assembly has performed the maximum number of drilling operations for that cutter so the operator can replace the cutter before using the drill assembly again.

REFERENCES:
patent: 2397974 (1946-04-01), Morrow et al.
patent: 3264873 (1966-08-01), Svenson
patent: 4123187 (1978-10-01), Turner
patent: 4473329 (1984-09-01), Aoshima et al.
patent: 4507834 (1985-04-01), Chen et al.

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