TM 9-243
TYPES AND USES - Continued
ADJUSTABLE-BLADE REAMER
The blades of an adjustable reamer are separate from
the body and are fitted into grooves in the threaded
shank of the tool. Adjusting nuts located below and
above the blades control the diameter of the reamer.
The reamers come with straight (1) or spiral flutes (2),
with or without a floating pilot on solid mandrels, and in
several sizes. Adjustable reamers are also available in
sets. They are used to enlarge drilled holes to an exact
true size using a series of small cuts rather than one
deep cut.
PIPE REAMER
Pipe reamers are made of carbon steel. They are
tapered with straight or spiral flutes. They come in three
sizes, 1/8-inch to l-inch pipe capacity, 1/4-inch to
1-1/4-inch pipe capacity, and 1/4-inch to 2-inch pipe
capacity. Most pipe reamers are designed to receive a
T-handle (1). Others (2) have a tapered square shank
for use with a brace, or a round shank for use with a hand
drill. They are used to remove burrs from the inside
diameters of pipe and drilled holes.
USING A SOLID STRAIGHT-HOLE REAMER
1 Secure the work in a vise so that the hole to be
reamed is perpendicular to the top of the vise jaws.
2
Using a tap wrench (1), tighten the handle to the
square end of the reamer shank (2).
CAUTION
Do not turn the wrench counterclockwise
at any time. To do so will cause the reamer
to become dull.
3
Position the reamer (3) at the top of the hole. Turn
the wrench clockwise very slowly until the reamer is
centered in the hole. Straight-hole reamers (4) have
a slight taper at the end so they will fit into the hole
easily.
39-3
