2-2
Introduction
Right Angle Positive Feed Tools
Our positive feed drill motors are available in both
in-line and right angle configurations
(please also
see the in-line tool section)
, The right angle tools are
rapidly growing in popularity due to their compact
size, light weight and ease of operation.
In-line drills have a limited stroke, but with a right
angle drill a deeper stroke can be achieved by
simply applying a longer spindle and nosepiece. In
addition, the fixtures do not have to be as robust
with a right angle drill, which represents a significant
cost savings. The tools themselves weigh less and
in use are closer to the fixture, resulting in less
deflection of the fixture. Right angle tools have also
been shown to reduce operator fatigue.
In general, positive feed drills are used for the
larger holes and heavier structures in the aircraft
industry such as the spars and the ribs, primarily in
landing gear, wing and fuselage joins.
Positive feed drills produce a hole in a predictable
and constant time. With each revolution of the spindle,
the cutter travels a precise distance, i.e., one-
thousandth of an inch or three-thousandths of an
inch depending on the settings. This is true whether
the tool is drilling air or drilling a tough alloy. The
benefit is that burrs caused by surging
of the cutter on the exit side of the
cycle are virtually eliminated.
Since the cutter advances a precise
distance with each revolution, the cutter
does not rotate without cutting. This
reduces heat and deformation, resulting
in less chance of the material work
hardening.
Many of the accessories for our
in-line and right angle tools are
interchangeable, such as chucks, nose
pieces, motors and gears.
How Positive Feed Right
Angle Drills Operate
The fixed rate of spindle advancement
(feed) for each rotation of the drill spindle
in right angle tools is accomplished by
differential gearing. The spindle of a right
angle drill has external left-hand threads
and four drive grooves that run the
length of the spindle. The spindle fits
into and through two gears: the spindle
drive gear and the spindle feed gear.
The spindle drive gear has internal
male splines that engage the drive
grooves on the spindle. When the air
motor is turned on, the spindle drive
gear rotates, turning the spindle.
The spindle feed gear is threaded
internally to match the external thread
of the spindle, and its function is to
Spindle
Feed Stop
Collar
Feed
Engagement
Lever
Air Motor
Spindle
Guard
Differential Feed Gear and
Differential Drive Gear
Tool Nose
Spindle
Feed Gear
(Threaded)
Spindle
Drive Gear
(Splined)
(28 pages)
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