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Temperature Induced Dimensional Changes Temperature causes various materials to change size at different rate, known as their Coefficients of Expansion (COE). The effects of this phenomenon on precision dimensional measurements are continuous and costly to industry. Precautions can be taken to allow parts and gages to temperature stabilize before conducting gage R & R studies, but the fact remains that on the shop floor temperatures vary all the time. The slow pace at which industry has accepted this reality probably has to do with the subtlety of these tiny size variations and our inability to sense gradual, but significant temperature changes.
The purpose of this article is to discuss ISO 4156/ANSI B92.2M-1980 and to compare it with other, older standards still in use. In our experience designing and manufacturing spline gauges and other spline measuring or holding devices for splined component manufacturers throughout the world, we are constantly surprised that so many standards have been produced covering what is quite a small subject. Many of the standards are international standards; others are company standards, which are usually based on international standards. Almost all have similarities; that is, they all deal with splines that have involute flanks of 30 degrees, 37.5 degrees or 45 degrees pressure angle and are for the most part flank-fitting or occasionally major-diameter-fitting.
News Items About gages
1 Marposs Gages Go Wireless (April 20, 2006)
Marposs Corp. introduced its M1 Wave wireless electronic bore gages at IMTS. "Marposs has cut the cord," said product manager Bob Harm... Read News
2 Mahr Federal Promotes Air Gages at Eastec (April 4, 2013)
Mahr Federal will be featuring the new Micro-Dimensionair II, the next generation of its Micro-Dimensionair line of portable air gages, a... Read News
3 Rush Gears Introduces Gear Gages (April 19, 2006)
Rush Gears is introducing a new line of gear gages with standard diametral pitch sets coming with 3, 4, 6, 8, 10, 12, 16, 20, 24, 32, and... Read News
4 PG-Series Bore Gages Mount Directly to Machines (February 13, 2008)
With no need for electrical or air connections, Sunnen’s PG-Series Bore Gages can be mounted directly to machining stations, making... Read News
5 Sunnen Bore Gages Offer Precise Hole Measurement (November 29, 2012)
Sunnen's PG Bore Gages take an intuitive approach to hole gaging with a mechanical design and speedometer-type scale for quick visual... Read News
6 Mahr Federal to Display Portable Air Gages (May 14, 2013)
Mahr Federal will be featuring the new Micro-Dimensionair II, the next generation of its well-established Micro-Dimensionair line of port... Read News
7 Mitutoyo Introduces QM-Height Digital Gages (August 22, 2014)
Mitutoyo's next generation QM-Height digital height gage line offers a best-in-class accuracy of 4.5 µm and significant improve... Read News