Precision Measuring Tools
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blade
micrometer
Meaning
Precision Measuring Tools
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Blade micrometer is a
measuring device that
has a thin blade to
reach inside narrow
recesses.
Blade micrometer is used for measuring
The blade micrometer measures narrow where the standard micrometer spindle could
grooves and keyways.
not be accommodated.
Combination set is
used as a rule, a
combination
square, a miter, a
set
depth gage, a height
gage, and a level.
The combination set consists of: blade, center
head, protractor head, combination square
head, scribe, and spirit level.
Combination set
comparator
Comparator
graphically displays
and measures
dimensions and
shapes that would be
difficult to measure
with regular tools.
Optical measurement is a different and
valuable aid to quality control. Capable of
magnifying an object hundreds of times.
Also known as shadow graph
depth
micrometer
Depth micrometer
measures depth of
holes, slots, and other
recesses.
Measuring a depth of a slot.
These micrometers come as a set with
interchangeable rods to accommodate
various measurements.
Dial indicators check
alignment of machine
components; show the
variation of the object
being measured.
There are 2 types of
dial indicators:
dial
indicators
a. Balanced reading
(has figures in both
directions from the
zero)
b. Continuous reading
(numbered
continuously)
disc
micrometer
Dial indicators can be used to make
linear measurements.
Continuous reading dial indicator
Disc micrometer
measures forming
tools, cutting edges,
narrow slots.
The disc micrometer is also called a
flange micrometer.
gage block
set
Gage block set is also
known as "Jo Blocks".
Precision-round
square or rectangular
blocks are made of
steel, chrome, or
tungsten carbide.
micrometer
Micrometer is used to
measure materials. It
is available in metric
and inch systems. The
most common are the
outside and inside
micrometers.
This micrometer finds its application in
measuring flanges and hard to reach areas.
Gage blocks are used for:
- calibration and inspection of precision
instruments
- to set comparators/indicators
- setting of sine bars
- precision layout
The measuring surfaces are lapped and - machine setups
polished to 200 milionths of an inch.
The most commonly used precision
instrument.
Available in different shapes and sizes
outside
caliper
Rules are also used for transfer
measurements with calipers. It is used for
semi-precision and comparison
measurement. They depend on "feel" to
measure a part.
Outside caliper
measures an outside
surface.
The outside caliper is used to measure
outside diameter.
plug gage
A type of "Go" or "NoGo" gage used to
admit or refuse the
inside dimension of an
object.
There are three types:
- plain cylindrical
- cylindrical taper
- thread plug gage
ring gage
They are mounted at the ends of an aluminum
handle. "Go" in one end and "No-Go" on the
opposite end.
Available in different sizes
There are three types:
A type of "Go" or "NoGo" gage used to
admit or refuse the
outside dimension
being checked.
- plain ring gages
- taper ring gages
- thread ring gages
Ring gages are used as sets.
screw
thread
micrometer
sine bar
The 60 degree
comparator
micrometer is usually
called a screw thread
comparator
micrometer or pitch
micrometer.
The pitch diameter, the most important
Measuring the pitch diameter of a screw measurement of a screw thread.
thread.
Sine bar is used for
checking angles,
typically used with
gage blocks.
The sine bar is a precision bar that has been
hardened and then ground and lapped to very
precise dimensions. It is also used for
machine setups.
Precise angles are measured using the
sine bar.
Various types of snap gages:
snap gage
Snap gage gages
diameters, lengths,and
thickness.
- adjustable snap gage
- adjustable roll snap gage
- dial indicator snap gage
The adjustable limit snap gage is used to
check outside diameter.
square
A square has two
straight edges that
form a right angle.
A machinist uses several types of squares for
a variety of jobs. A square is used for
inspecting squarness and laying out work.
A master precision square
surface
gage
Surface gage is a
scribing tool that draws
lines parallel to a
surface. When
combined with test
indicator, flatness,
parallelism and heights
may be inspected.
Surface gages are designed for a variety of
uses. The main uses are for scribing lines,
transferring measurements and for probing
surfaces in inspection work.
The surface gage
universal
bevel
protractor
Universal bevel
protractor is used to
lay out, measure, or
check angles.
The bevel protractor can measure
angles to five minutes of a degree.
Vernier
caliper
Vernier caliper is a
precision measuring
tool capable to read
within .001 inch. Used
for inside, outside and
depth measurements.
A Vernier caliper consists of a beam with a
fixed measuring jaw, a sliding jaw witht he
Vernier scale, and a mechanism for making
fine adjustments.
The Vernier caliper
Vernier
gear-tooth
caliper
Vernier gear-tooth
caliper measures gear
teeth using two Vernier
scales.
Designed to measure the thickness of
gear teeth.
It is rugged and
reliable tool that gives
precise and
Vernier
dependable
height gage measurements over
long vertical ranges. It
is also used for
precision layout.
The Vernier height gage