ISE 426 project

ISE 426 project - Executive Summary Part and Measurement...

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Executive Summary Part and Measurement Device: Our assignment for this project was to measure the thickness of the provided coarse thread hexagonal zinc nuts. In order to measure this item, we used a caliper that was accurate to the thousandth of an inch but through estimation, values to the ten thousandth of an inch could be attained. Using this device, we were able to determine that the nominal dimension, or the total average thickness measured, of the nut was 0.4369 inches. Measurement Process: To attain our measurements, we had each operator measure seven parts and then the next operator measure the same seven. This process was repeated until all thirty-five parts were measured and then repeated in order to get the second set of measurements. Stability and Components of Variation: Through analysis of our R and Xbar Charts as well as our gage to product ratio, we determined that our system of measurement was not accurate. The R-chart for Operator 2 was out of control and the Xbar chart for both operators was out of control. Additionally, σ gage product was greater than 0.1 for both operators indicating that the performance of the gage was inadequate. Reproducibility was nearly double repeatability indicating there was more variation between operators than between measurements for a single operator. Measurement System Recommendations: Our main recommendation for the measurement system is to take more measurements of each part. This will result in outliers having less of an effect on our data. Because the variance of x- bar is equal to the variance of x, divided by n, increasing the number of measurements (n) will lead to a dramatic improvement in the variability of our data. Secondary improvements to the measurement
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system, such as keeping track of which side to measure and reducing the possibility of thermal expansion, will be discussed later in the report. 1. Procedure For our measurement analysis we were assigned to measure the thickness of a hexagonal coarse thread zinc nut. In order to retrieve measurements on the thickness of the nut, our team used an Alltrade caliper that yielded measurements down to a thousandth of an inch and through estimation, it was possible to receive a measurement as small as a ten-thousandth of an inch. Our task was to measure the thickness of thirty different zinc nuts and measure each of the nuts twice in order to attain a measurement for the repeatability of each operator. Our goal was to retrieve as much data as possible in the allotted time so as to have more to base our conclusion off of and give this conclusion more merit as a result of the increased amount of data supporting it. In our allotted time, we were able to measure thirty-five nuts, two times each. When first given our task, we quickly analyzed the situation and tried to diminish as
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This note was uploaded on 02/12/2010 for the course ISE 426 taught by Professor Palmer during the Spring '06 term at USC.

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ISE 426 project - Executive Summary Part and Measurement...

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