Abstract
Power screws are elements used for converting rotary motion to linear motion in machines. There are three forms of power screw threads: the square thread, the Acme thread, and the buttress thread. Power screws may also be either single-thread or double-thread or triple-thread. In this chapter, we only consider power screws with the Acme threads and provide unique graphical methods for designing them.
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Abbreviations
- d :
-
Screw diameter, mm
- d 2 :
-
Mean diameter of screw, mm
- d 3 :
-
Minimum diameter of screw, mm
- F :
-
Applied tension/compression force, kN
- F 1 :
-
Allowable tension and compression force of screw, kN
- F 2 :
-
Allowable force on nut, kN
- F 3 :
-
Allowable buckling force, kN
- L :
-
Screw length, mm
- l n :
-
Nut length, mm
- \(p_{p}\) :
-
Allowable thread pressure of nut, MPa
- R e :
-
Yield strength of screw, MPa
- R m :
-
Ultimate tensile strength of screw, MPa
- S :
-
Buckling safety factor
- T :
-
Torque required for turning screw, MPa
- μ :
-
Coefficient of friction
- \(\sigma_{p}\) :
-
Allowable stress of screw, MPa
- \(\sigma_{t}\) :
-
Equivalent stress, MPa
References
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Decker K-H, Kabus K (2014) Decker Maschinenelemente: Funktion, Gestaltung und Berechnung. Carl Hanser Verlag, München (in German)
Juvinall R, Marshek K (2011) Fundamentals of machine component design, 5th edn. Wiley, New York
Mott RL, Vavrek EM, Wang J (2018) Machine elements in mechanical design, 6th edn. Pearson Education, New York
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Yaghoubi, M., Tavakoli, H. (2022). Power Screws. In: Mechanical Design of Machine Elements by Graphical Methods. Materials Forming, Machining and Tribology. Springer, Cham. https://doi.org/10.1007/978-3-031-04329-1_6
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DOI: https://doi.org/10.1007/978-3-031-04329-1_6
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