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MIT2_72s09_lec02_shaft

# MIT2_72s09_lec02_shaft - MIT OpenCourseWare...

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MIT OpenCourseWare http://ocw.mit.edu 2.72 Elements of Mechanical Design Spring 2009 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .

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2.72 shaft blank exercise The aims of this exercise are to measure and understand the (a) accuracy/repeatability of a lathe, (b) part deflections during turning, (c) the difficulty associated with meeting tight tolerances, (d) to fabricate the blank for your shaft and (e) to measure your shaft’s geometry. Names: Group: Total: 0 1.00 6.50 0.500 + 0.000 - 0.050 1.05 ± 0.0300 ± 0.0050 ± 0.0005 + 0.000 - 0.020 Tolerances : X.xx X.xxx X.xxxx R 0.30 + 0.020 - 0.020 5.00 0.591 + 0.000 - 0.002 R 0.30 + 0.020 - 0.020 5.87 0.89 All dimensions in inches; drawing not to scale Material: 12L14 steel Surface finish: 16 µ inch Step 1: Calculate the lateral bending stiffness of the shaft when its full length is cantilevered. K lateral : N/µm Step 2: List 3 errors that could affect shaft dimensions during turning, identify them as systematic / non- systematic. Error Systematic Nonsystematic Thermal X 01 02 03 Step 3: Meet with shop manager to discuss how to make your shaft
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MIT2_72s09_lec02_shaft - MIT OpenCourseWare...

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