Page 50 of Advanced Drilling Equipment by Cooper Power Tools

in-line tool accessories 230qgdab-su-ms depth and dwell attachment the quackenbush depth control or countersink attachment is a high quality precision attachment for the 230 series positive feed drill which is used to precisely control the depth of drilled and reamed straight or tapered holes on both flat or contoured surfaces the attachment is also used for precision countersink operations.this attachment has been proven on the most demanding hole preparation jobs in the aircraft industry and has earned the reputation for producing exceptionally high quality holes with precise depth accuracy roundness and a high level of finish how the depth and dwell attachment operates start threaded to the end of the depth and dwell attachment is a drill bushing which is used to secure the unit to the tooling fixture a tubular sensing sleeve is piloted by and slides axially inside the drill bushing the sensing sleeve surrounds and pilots the cutter and the spindle it is spring biased to engage the workpiece and seat against it the primary function of the sensing sleeve is to provide a positive definite stopping surface that is a precise repeatable distance from the workpiece finish attached to spindle is a patented micrometer type adjustable rotating stop with a self-contained anti-friction bearing designed to engage the sensing sleeve when the cutter has achieved the desired depth once the pre-determined depth has been reached the advancement of the cutter is stopped by the engagement of the adjustable stop on the spindle contacting the sensing sleeve this allows the cutter to dwell continue rotation without further feed and produce the desired hole characteristics the model 230 drill furnished under separate order features automatic thrust activated retract torque overload shear pin and automatic motor stop after retract when mounted on the model 230 positive feed drill the common spindle extends through and is driven by the right angle drill head spindles up to 15 long will be hollow for coolant flow a fluid inducer part no 381213 may be purchased for the remote end of the spindle rear spindle guards must be used on all applications note models designed for 1.186 maximum diameter cutters are common larger units for 1.750 maximum diameter cutters are available shortened models are available for short strokes in confined work areas 1-34

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