When it comes to measuring parts, precision is a topic that is frequently discussed. Precision is especially important to the automotive, medical device, and aerospace industries. However, these jobs also require coordinate measurement devices to be able to tolerate abrasive environmental conditions. We all know intuitively that changes in temperature affect both the features of the parts being examined and the measuring characteristics of the probe.
So how does a CMM reliably determine precise measurements free from thermal expansion coefficient exposure? Let’s investigate by looking under the hood.
The Fastrack linear encoder scale system from Renishaw combines carrier-type encoders with 5 m/m accuracy, stainless steel’s durability, and ease of installation. Two tiny guide rails keep low-profile scales (8 x 0.2 mm cross-section) in place that expand freely and with nearly no hysteresis at a thermal expansion coefficient independent of the machine structure.
It’s critical to ensure that the systems around high-precision measurement probes are built to support such measurements. Renishaw’s Fastrack and AIMS’ Revolution 5-axis mobile HB CMM complement one another in this regard. Steel, which is used to make the X and Z axes of the HB, can also contract and expand. Accuracy and repeatability are preserved because the X and Z axes of the Fastrack and the HB’s different materials can compress and extend independently of one another.
Due to light head loads, metallic constructions are prone to rapid distortion. Heat accumulates in one area and spreads to another, leading to malformation. A machine’s structure may experience transient heat loads as a result of something as simple as an open door to the exterior or sunlight entering a window. Because castinite is thermally stable, using it solves this problem. It can therefore reproduce smooth part surfaces down to the 1/10,000th of an inch.
Start with a CMM that can give you the information you need to ensure that your measurement systems are resistant to temperature changes.
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