TM 9-243
TYPES AND USES
ADJUSTABLE PARALLEL
Adjustable parallels consist of two tapered parts fitted
together. The distance between the two outside parallel
surfaces varies by moving mating parts together or
apart. This distance is then measured with a
micrometer. Adjustable parallels are used as gages for
leveling and setup work. Adjustable parallels are
available in various sizes depending on the nature of
work.
V-BLOCK AND CLAMP
The V-block and clamp assembly consists of a V-
shaped, hardened steel body to support round, square,
or rectangular shaped work. A clamp (or clamps) holds
the work firmly in the body groove. V-blocks and
clamps are especially used for grinding, milling, or
drilling purposes. Various styles and designs of V-
blocks
and
clamps
are
available
depending
on
application.
ANGLE PLATES
Angle plates are devices consisting of two flat outside
working surfaces jointed at right angles. The outside
work surfaces are precision ground. The standard angle
plate is permanently jointed at a right angle. However,
an adjustable type with varying angle adjustments is
also available. Angle plates are used for clamping or
holding work vertically. They are also used for layout,
inspection, or machine set-up. Various sizes and
designs are available depending on the task.
MAGNETIC BASE INDICATOR HOLDER
The magnetic base indicator holder is a one-piece metal
assembly
that
attaches
to
the
work
surface
magnetically. A gage or indicator attaches to the
assembly. Base indicator holders are used for attaching
gages to lathes, milling machines, shapers, or any
machine where graduations are difficult to read.
Magnetic base indicator holders are available in many
sizes and designs depending on application.
REGISTERING SPEED INDICATORS
Registering speed indicators are designed to count the
number
of
revolutions
of
wheels,
shafts,
etc.
Revolutions are counted by attaching spindle of speed
indicator to hub of shaft or wheel. Indicator spindle will
turn in either direction counting each revolution on a
circular dial. Various designs of speed indicators are
available depending on nature of use.
9-2
