Oct 25, 2019
For the measurement of the inner diameter of drills for example inside micrometers can be used.
They exist as 2-point of 3-point inside micrometer.
The advantage of 3-point-inside micrometer is its selfcentering.
Inside micrometers cannot be used for measuring roundness.
There are point and line measuring surfaces as well as the special case of beak measuring surfaces.
Measuring Technology: 3-point inside
micrometer for the measuring of inner diameters.
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Mar 12, 2020
A dial gauge-like length measuring instrument with a an angular movable sensor for small length difference measurement is called lever gauge.
Due to its design, it is very well suited for concentrically tests on lathes since the measuring pin cannot tilt. The flat design allows measurements in tight spaces.
With lever gauges it is always possible to measure in two directions.
This allows easy reading of the measured values with analogue devices, using the opposite line scale.
The correct measured value is obtained directly when the lever is parallel to the measuring surface. If the angle is too large, the measured value can be corrected by calculation.
The measuring range is usually between 0.01 and 0.5 mm and the deviations correspond to those of a dial gauge.
The measuring ball on the sensor is usually made of low-wear materials such as carbide or ruby.
Measuring Technology:
Lever Gauges have a angular movable sensor.
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Sep 22, 2019
The allowed upper and lower gages of a test specimen can be compared with a limit gauge.
It is checked, if the actual dimension of a test specimen is within a tolerance of a requested nominal dimension.
In contrast to the measurements with a caliper or a micrometer, there is no numerical value given.
There is only the statement, if the dimension of the test specimen is good or not.
A big advantage of the limit gauge is the cheap price, compared to e.g. a three-point inside micrometer.
So the limit gauge is very good to figure out if a part is good or needs to be rejected, or if post-treatment is necessary.
Measuring technology: Different kinds of
limit gauges
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Measuring technology
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Nov 6, 2019
Outside micrometers can be controlled and set with a linear standard.
The linear standard has a fixed length and can be also called control dimension or adjustment dimension.
Linear standards are available with a length from at least 25 mm, there are produced according to DIN 863. The measuring surfaces are flat, hardened, grinded and lapped.
Measuring technology: A
linear standard to set and control outside micrometers.
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Apr 18, 2024
Tactile measuring machines are often used to determine the geometric properties of plastic molded parts, for example.
These work by sensing (tactile) surface contours and features.
During the measuring process, a probe moves to specific points or along the surface of a molded part.
The determined dimensions (actual) are compared with the specified dimensions (target) and deviations are determined.
A measuring machine can be used to check the dimensional accuracy, form accuracy and other dimensional properties of molded parts and tools.
Thanks to its high precision and reliability, the tactile measuring machine enables efficient quality control and assurance during the production process.
The measurements help to detect errors at an early stage, reduce rejects and improve production quality.
Measuring technology: Figure 1: Tactile measurement of a
mold cavity
Measurement technology: Figure 2: Tactile measurement of a plastic
molded part
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
