Starrett pin gages are essential for verifying uniformity across manufactured equipment and parts. Pin gages may also be used for measuring the accuracy of other instruments such as micrometers and calipers. Regular Starrett pin gage calibration testing is a necessity to make sure that each gage is within tolerance. In manufacturing applications use of an inaccurate pin gage can result in creation of bad parts or scrapping good parts. Pin gages can also be difficult to work with due to temperature fluctuations.
Starrett pin gages are made from hardened tool steel. Tool steel refers to steel developed specifically for tooling, demonstrating a resistance to expansion or retraction at extreme temperatures. When the temperature rises, a gage can expand. When exposed to cold temperatures, gages tend to contract or shrink. When the gages are used in environments with different temperatures, the difference can be noticeable.
The casual observer may determine that a change in the size of a pin gage would may not matter if the equipment it is measuring would also change size when exposed to different temperatures. If the pin gage expands at a given temperature, for example 90°F, the object being checked with the pin gage will also expand at 90°F – eliminating any problem. The problem with this logic is that the rate of change is not considered. If the object being measured expands at a different rate than the gage, the accuracy will be compromised.
The environment in which the pin gages are used may vary from that of the calibration laboratory. The results of Starrett pin gage calibration testing may appear quite different from what is expected. It is normal during pin gage testing to find that results are slightly different than what is observed in the field.
If you have any questions about Starrett pin gage calibration, or would like a quote, contact e2b calibration.