MSL_LAB1 - Experiment #1: Geometric Measurements and...

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Experiment #1: Geometric Measurements and Tolerances Abstract: Understanding dimensional tolerance is necessary for manufacturing and design. To become familiar and fluent in dimensional tolerances, aluminum parts, which were machined to the same specifications, were measured with a caliper or micrometer. The underlying statistical models enable determining tolerances and modeling the full assembly. Quality mechanical parts need to be created in an efficient and cost effective manner, and the solution is based upon these models. MANE 4040-04 Mechanical Systems Laboratory Thursday, February 7, 2008 Professor: Antoinette Maniatty Team: Dan Garr Carl Hansen Matt Wilcox Adam Larouche Samuel Harrington
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– 1 of 10 – I. Introduction : Mechanical design and production is an art of approximation. Even in the context of modern, computerized machining processes, production standards can never be perfectly precise. An understanding of dimensional tolerances and the statistical models used to compute acceptable values for these tolerances is crucial to the art and process of mechanical design. With appropriate assignment of tolerances and statistical analysis, companies can maximize the fraction of their product that will perform as intended in an efficient manner. The means of measurement in this lab are the micrometer and the caliper. The micrometer has a claimed accuracy of ±.00005 inches, while the caliper has a claimed accuracy of ±.001 inches. Repeated measurements will first be made with these instruments to verify that these claimed accuracies are correct, and then each tool will be used to measure the dimensions in question. The rest of the lab relies on the statistical analysis of these dimensions. The statistical analysis used in this lab is based on the Gaussian normal distribution, commonly referred to as the “Bell Curve.” Calculated averages and deviations from the averages will be normalized to coincide with this distribution, and the results that follow will be a reflection of this distribution. The distribution will be used to determine what tolerances are acceptable for the production of the parts in the lab. Significant aspects of this lab rely on the accuracy and precision of the tools used and acquired values. In order to ensure accuracy, the degree to which a measurement coincides with the absolute standard of measure, an analysis of the measuring devices will precede any analysis of the various parts. To ensure precision, the degree to which successive measurements are accurate with regard to each other, one person will make all of the measurements in the lab. These are the best ways to ensure accuracy and precision of the data acquired. II. Apparatus Details : There are two measurement devices used in this experiment: a digital micrometer and digital calipers. The micrometer claims accuracy to ±0.00005 inches and the caliper to ±0.001 inches. Before use, both instruments should be zeroed at their fully closed positions. The parts being measured are 10 square plates, each approximately 0.1 in thick, and three
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This note was uploaded on 04/22/2008 for the course MANE 4040 taught by Professor Maniatty during the Spring '08 term at Rensselaer Polytechnic Institute.

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MSL_LAB1 - Experiment #1: Geometric Measurements and...

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