Right Angle Tools
2-20
230QGDA-RAC-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
䡵 Start
Threaded to the end of the Depth and Dwell
Attachment is a DRILL BUSHING ➂ which is used to
secure the unit to the tooling fixture ➁. A tubular
SENSING SLEEVE ➅ is piloted by and slides axially
inside the DRILL BUSHING ➂. The SENSING SLEEVE
surrounds and pilots the CUTTER ➆ and the SPINDLE
➇. It is SPRING ➃ biased to engage the WORKPIECE
➀ and seat against it ➄. The primary function of the
SENSING SLEEVE is to provide a positive, definite
stopping surface that is a precise repeatable distance
from the workpiece.
䡵 Finish
Attached to SPINDLE ➇ is a patented micrometer
type, ADJUSTABLE ROTATING STOP ➈ 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 Right Angle 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 Right Angle
Positive Feed Drill, the common SPINDLE ➇ 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.
(28 pages)
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