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Case
Study:
Possehl Connector Services SC, Inc. February 10-16, 2004 Original Condition: Possehl Connector Services SC, Inc. contacted the Institute for Manufacturing Productivity at York Technical College to inquire if angles could be measured between pins on a round plating tool. The angles must be measured precisely to 1/1,000th of a degree. There are 19 pins located on a round plastic tool with diameter of approximately 10 inches. The pins should be equally spaced at angles of 360 degrees divided by 19 pins or 18.9474 degrees. IMP Assistance: William W. Beaver, P.E. was assigned the project. The IMP’s Mitutoyo Crysta Plus 504 DCC Coordinate Measuring Machine calibrated and traceable to N.I.S.T. was used for the measurements. The primary challenge of this project was how to develop a method for accurately touching a sharp point mounted on a round tool. See Photo 1 below: Photo 1
Pins with sharp point The challenge is to measure the angle between the points of the pins. Notice the shape of the tool with raised edges creating difficulty for gages to be used properly on the pins The Renishaw Disc styli with 25.0mm diameter was purchased to minimize contact error of the touch probe. See Photo 2 below: Photo 2
Renishaw Touch Probe with 25.0mm diameter disc styli After adding a holding fixture to the top of the round tool, a Plane/Circle/Line part coordinate system was established. This establishes the center of the circle as the XY origin. The CMM was set to measure in a polar coordinate system as well. Next, seven touch measurements on the end of each pin were recorded and averaged automatically by the CMM. The average of the seven touch measurements was used as the point measure for the end of the pin. The CMM calculated the radius and angle from the origin to the pointed end of the pins.
Data from CMM measurements:
Angles between each pin was measured to 1/10,000th of a degree and recorded as well as the total average, range, and standard deviation minimum. Summary: These measurements provide useful insight into the accuracy and precision of the manufacturing process of the tool as well as the sensitivity of the process to run the tool. Economic Impact: Unknown the time of this project and report. |
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