Nov 11, 2019
An annular test gauge made of high-quality hardened steel is called adjusting ring. The steel is ground very fine and lapped for this usage. The adjusting ring serves as a reference dimension for multiple bore gauges, like the three point inside micrometer or the inside measuring surface of calipers.
Mostly setting ring gauges are knurled on the outside so that they are well in hand when measuring or adjusting the bore gauges.
Measuring technology: An adjusting ring as a reference dimension for bore gauges.
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
Nov 7, 2023
Good quality plastic parts are achieved when the boundary conditions in production are stable.
In addition to the set process parameters such as melt temperature, injection and packing pressure time, etc., there are also influencing variables that have received little attention to date.
These include the ambient temperature in the production process itself.
Depending on the process, this can have a critical effect on the quality of the injection moulded parts produced.
For example, the temperature on the mold surface will drop if a hall door is opened near the machine.
The AmbientScan module has been developed to monitor the temperatures in a production cell.
The integrated sensors record the temperature, air pressure, volume and humidity and send the data to a central server.
This allows trends to be visualised over days and weeks so that fluctuations can be counteracted by automatically generated alarm messages.
Measuring technology:
Ambient scan with open front panel and view of the sensors
Measuring technology: Data is sent directly to a server for analysis via WLAN
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.
May 18, 2021
Just as for length, there are also for angles dimensional standards similar to gauge blocks available.
By combining angle gauge blocks with dimensions between 0 ° and 90 ° in steps of at least 1 second (special designs) any angle can be assembled.
As with parallel gauge blocks, this is done by pushing the measuring surfaces together.
This simplifies the measuring of angles, cones and angular divisions.
This makes it possible to set degrees, minutes and seconds precisely and quickly in any combination.
For example an angle gauge block set with 16 angle gauge blocks allows about 35000 angle combinations in a range from 0 ° to 90 ° in special steps of 1 second.
Measuring Technology:
Angle Gauge Block
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Sep 15, 2020
The comparison of a measured value with the nominal value of a test device is called calibration.
The following conditions are important:
– the documentation of the deviation
– the calculation of the measurement uncertainty
– the creation of a certificate
The test devices must be calibrated at regular intervals in order to achieve permanently correct measured values.
This is to gain confidence in the test devices beeing used.
After calibration, each test device is clearly marked with a test badge showing the next calibration date.
In addition, the test equipment is given a unique number to identify it and establish the connection to the correct certificate.
The calibration is documented in a calibration certificate with test equipment data and the measured values.
The certificate also lists which laboratory carried out the calibration, which facilities, procedures and reference devices were used and which ambient conditions prevailed during the calibration.
The certificates, which are issued by the performing calibration laboratory, document the condition of the test equipment during calibration.
Measuring technology: During
calibration the measured value is compared to the nominal value
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Jul 8, 2019
For a quick measurement of plastic parts, a so called caliper is used in general.
This distance measuring device has one stick with two outside and two inside measuring legs.
The top ones of the measuring legs are fixed, while the bottom ones are movable.
Additionally, some calipers have a measurement rod to measure the depth.
With outside, inside and depth-measurement more or less every tolerance of a plastic part can be checked.
A difference in calipers can be found in how the measured values are displayed.
There are three different display types available:
– Ruled scale (Vernier)
– Dial
– Digital
It has to be noted that especially for soft plastic (like TPE), a too high pressure on the movable measuring legs will distort the measured value.
Furthermore, the measurement at small supports may lead to a tilt and hence a distortion of the measured value.
These are the reasons why, after the first measurement with caliper, additional measurement devices are necessary for exact measurement.
For example: A testing pin is better suitable for the inside measurement of a plastic part.
Image 1: Measuring technology: Calipers with vernier and digital display.
Image 2: Measuring technology: Caliper with dial display.
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Measuring technology
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This glossary of plastic industry is provided by PLEXPERT Canada Inc.