Precision Measuring Tools
Word |
Meaning |
Context |
More Information |
| blade micrometer |
Blade micrometer
is a measuring device that has a thin blade to reach inside narrow recesses. |
The blade micrometer
measures narrow grooves and keyways. |
Blade micrometer
is used for measuring where the standard micrometer spindle could not
be accommodated. |
| combination set |
Combination set is
used as a rule, a square, a miter, a depth gage, a height gage, and a
level. |
Combination set |
The combination set
consists of: blade, center head, protractor head, combination square
head, scribe, and spirit level.
|
| comparator |
Comparator graphically
displays and measures dimensions and shapes that would be difficult to
measure with regular tools. |
Also known as shadow
graph
|
Optical measurement
is a different and valuable aid to quality control. Capable of magnifying
an object hundreds of times. |
| 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 |
Dial indicators
check alignment of machine components; show the variation of the object
being
measured. There are 2 types of dial indicators:
a. Balanced reading
(has figures in both directions from the zero)
b. Continuous reading
(numbered continuously) |
Dial indicators can
be used to make linear measurements. |
Continuous reading
dial indicator
|
| disc micrometer |
Disc micrometer measures
forming tools, cutting edges, narrow slots. |
The disc micrometer
is also called a flange micrometer. |
This micrometer finds
its application in measuring flanges and hard to reach areas. |
| 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. |
The measuring surfaces
are lapped and polished to 200 milionths of an inch. |
Gage blocks are used
for:
- calibration and
inspection of precision instruments
- to set comparators/indicators
- setting of sine bars
- precision layout
- machine setups |
| micrometer |
Micrometer is used
to measure materials. It is available in metric and inch systems. The
most common are the outside and inside micrometers. |
The most commonly
used precision instrument. |
Available in different shapes and sizes |
| outside caliper |
Outside caliper measures
an outside surface. |
The outside caliper is used to measure outside diameter. |
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. |
| plug gage |
A type of "Go" or
"No-Go" gage used to admit or refuse the inside dimension of
an object.
There
are three types:
- plain cylindrical
- cylindrical taper
- thread plug gage |
Available in different sizes |
They are mounted
at the ends of an aluminum handle. "Go" in one end and "No-Go" on the
opposite end. |
| ring gage |
A type of "Go" or
"No-Go" gage used to admit or refuse the outside dimension being checked. |
Ring gages are used
as sets. |
There are three
types:
- plain
ring gages
- taper ring gages
- thread ring gages |
| screw thread micrometer |
The 60 degree comparator
micrometer is usually called a screw thread comparator micrometer or
pitch micrometer. |
Measuring the pitch
diameter of a screw thread. |
The pitch diameter,
the most important measurement of a screw thread. |
| sine bar |
Sine bar is used
for checking angles, typically used with gage blocks. |
Precise angles are
measured using the sine bar. |
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. |
| snap gage |
Snap gage gages diameters,
lengths,and thickness. |
The adjustable limit
snap gage is used to check outside diameter. |
Various types of
snap gages:
- adjustable snap gage
- adjustable roll snap gage
- dial indicator snap gage |
| square |
A square has two
straight edges that form a right angle. |
A master precision
square
|
A machinist uses
several types of squares for a variety of jobs. A square is used for
inspecting squarness and laying out work. |
| 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. |
The surface gage
|
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. |
| 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. |
The Vernier caliper
|
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. |
| Vernier gear-tooth
caliper |
Vernier gear-tooth
caliper measures gear teeth using two Vernier scales. |
Designed to measure
the thickness of gear teeth. |
|
| Vernier height gage |
It is rugged and
reliable tool that gives precise and dependable measurements over long
vertical ranges. It is also used for precision layout. |
The Vernier height
gage
|
|
