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S.T.B.S College of Diploma Engineering, SURAT

S.T.B.S College of Diploma Engineering, SURAT. Class: Mech-1051(B) . Prepared.BY: Thumar Sanket C. EN.NO:106470319020 APP.BY:Mr.CRS. TOPIC : Screw jack. There are two distinct uses for screw threads and they usually demand different behavior from the threads :

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S.T.B.S College of Diploma Engineering, SURAT

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  1. S.T.B.S College of Diploma Engineering, SURAT Class: Mech-1051(B) Prepared.BY:Thumar Sanket C. EN.NO:106470319020 APP.BY:Mr.CRS TOPIC : Screw jack

  2. There are two distinct uses for screw threads and they usually demand different behavior from the threads : • a   power screw such as a lathe leadscrew or the screw in a car lifting jack which transforms rotary motion into substantial linear motion (or vice versa in certain applications),

  3. A power screw is a device that is common to tools or machinery that are used to change angular motion into translation. It is also capable of developing a large amount of mechanical advantage. Familiar applications include clamps or vises, presses, lathes lead screws, and jacks.

  4. Weight supported by three screw jacks. In each screw jack, only the shaded member rotates.

  5. Figure 8-1 Terminology of screw threads. Sharp Vee Threads shown for clarity; the crests and roots are actually flattened or rounded during the forming operation

  6. Threads (a) Single (STANDARD)-, (b) double-, and (c) triple threaded screws.

  7. Power screw thread forms. [Note: All threads shown are external (i.e., on the screw, not on the nut); dm is the mean diameter of the thread contact and is approximately equal to (d + dr)/2.]

  8. Efficiency which, is the torque required to raise the load. • The efficiency is therefore

  9. Thank you…

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