2 There are two jack screw assemblies both with an ISO Metric Trapezoidal 'Tr 16 x...
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2 There are two jack screw assemblies both with an ISO Metric Trapezoidal 'Tr 16 x 3' screw, one single-thread and the other double-thread. Each assembly raises and then lowers a load of 450 kg. A ball-thrust bearing forms part of each assembly and therefore collar friction is negligible. The coefficient of sliding friction for both screws is 0.08. (a) For each assembly, determine: (1) (ii) (iii) Which assembly is the most efficient in lifting? One way of ensuring that a lifting device can be made to self-lock is to use a thrust collar rather than a ball-thrust bearing. For any of the assemblies found to be back-driveable in (a)(iii), what is the minimum collar diameter required to ensure it/they would self-lock? (Assume the same value of friction coefficient of 0.08 in all situations). (b) (c) the pitch, pitch diameter, lead and lead angle; the running torque required to lower the load; whether they are back-driveable or self-locking? 2 There are two jack screw assemblies both with an ISO Metric Trapezoidal 'Tr 16 x 3' screw, one single-thread and the other double-thread. Each assembly raises and then lowers a load of 450 kg. A ball-thrust bearing forms part of each assembly and therefore collar friction is negligible. The coefficient of sliding friction for both screws is 0.08. (a) For each assembly, determine: (1) (ii) (iii) Which assembly is the most efficient in lifting? One way of ensuring that a lifting device can be made to self-lock is to use a thrust collar rather than a ball-thrust bearing. For any of the assemblies found to be back-driveable in (a)(iii), what is the minimum collar diameter required to ensure it/they would self-lock? (Assume the same value of friction coefficient of 0.08 in all situations). (b) (c) the pitch, pitch diameter, lead and lead angle; the running torque required to lower the load; whether they are back-driveable or self-locking?
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The image contains text about a mechanical engineering problem related to jack screw assemblies The task involves calculating various parameters such as pitch pitch diameter lead and lead angle the ru... View the full answer
Related Book For
Fundamentals of Thermodynamics
ISBN: 978-0471152323
6th edition
Authors: Richard E. Sonntag, Claus Borgnakke, Gordon J. Van Wylen
Posted Date:
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