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[7] - Staying in touch what criteria determine the best...

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Staying in touch: what criteria determine the best probing system for your CMM? And should you go for scanning or touch-trigger measurement?(quality) Article from: Metalworking Production Article date: April 1, 2004 Author: Tomkinson, Gareth More results for: coordinate measuring machine cmm probe touches OVER the past 30 years CMM technology has evolved to meet increasingly tighter tolerances demanded by manufacturing and design engineers. These accuracy demands, combined with the perpetual drive for increased inspection efficiency and throughput, have led to diversified sensing approaches on CMMs. This can lead to confusion as to the best sensing system for your shop's applications. Since a CMM represents a significant investment in capital equipment for large manufacturers and small job shops alike, it must be tailored to handle your specific needs, while providing flexibility for growth as inspection demands change. So what is the best sensing solution to fit on your CMMs? Consideration of five factors will help determine what type of inspection system will deliver the biggest benefits to your specific application. Part print of the components to be measured The part print determines the design intent and identifies the dimensional and geometric tolerances required. Features that form functional fits with other parts are best measured by scanning, whereas discrete point measurement is often sufficient for less critical features. Type of measurement required The type of measurement required, combined with the part print, will determine whether a bridge, gantry or horizontal-arm CMM will be best for the measurement task. The type of CMM required will often dictate which sensing system is best. For example, the measurement of gap and flush of a body-in-white will stipulate different probing requirements than those optimised for prismatic or powertrain applications. Machining process capability The performance of your machining process relative to the required tolerance will also affect your choice of process control method . If your machining processes reliably produce good features with consistent form, then you will need to focus on controlling feature size and
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position. Discrete point measurement is ideal for this. By contrast, if your machining processes produce features with form that varies by a significant proportion of the tolerance, then you will need to monitor and control the form. Scanning is the beat process for this task.
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