Cutting by use of rotating axially moving tool – Including means to cause tool to progressively vibrate...
Patent
1990-10-24
1991-12-17
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Including means to cause tool to progressively vibrate...
408130, 408702, B23B 4722, B23B 4734
Patent
active
050730681
ABSTRACT:
A peck feed drilling machine incorporates a pneumatically operated vane motor and peck feed components. The vane motor drives a conventional drill bit through a speed reducing gear train. The peck feed assembly includes a plurality of multi-state shuttle valves which cooperate with a drilling feed piston, a peck piston and a clutch assembly to incrementally advance and fully retract the drill bit to peck drill an aperture. The drilling machine also includes a dashpot which adjusts the feed rate of the drill bit, a second dashpot for slowing the drill bit as it breaks through the workpiece and countersinks, a threaded mechanism for adjusting the depth of drilling and a spring mechanism for slowing the advance of the drill bit just before it engages the workpiece.
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Doeden Douglas D.
Jinkins Danny R.
Doler Inc.
Howell Daniel W.
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