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Screw Jacks Calculation

This document describes the calculation of effort force for a screw jack. It provides the design conditions including the effort force, weight or load, pitch distance, pitch radius, and lever arm radius. It then presents an equation to calculate the effort force for a screw jack when neglecting friction based on these design parameters. Several examples are given applying this equation with different given values.

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Tarmana Antt
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2K views27 pages

Screw Jacks Calculation

This document describes the calculation of effort force for a screw jack. It provides the design conditions including the effort force, weight or load, pitch distance, pitch radius, and lever arm radius. It then presents an equation to calculate the effort force for a screw jack when neglecting friction based on these design parameters. Several examples are given applying this equation with different given values.

Uploaded by

Tarmana Antt
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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SCREW JACKS CALCULATION

1. Calculate screw jacks effort force


1.1 Design Condition
Effort force at the end of the arm or handle F = 322.3
Weight or load Q = 11023.1
Pitch distance or lead of thread in one turn P = 0.2
Pitch radius of screw r = 0.8
lever-arm radius R = 2.4
1.2 The effort force for a screw jack when neglecting friction can be expressed as
F = 146.1986 kg
Doc. No :
W.O :
Revision No : B
Sheet : 1
lb 146.1986 kg.mm
lb 5000 kg
in 5 mm
in 20 mm
in 60 mm
allowable stress : 2/3 of yield strength or about 1/4 of ultimate tensile strength
Ultimate tensile strength, 58-80ksi 400-550 MPa
Yield point, min., 36 KSI 250MPa
Source(s):
ASME II Part A
166.6667
SCREW JACKS CALCULATION
1. Calculate screw jacks effort force
1.1 Design Condition
Effort force at the end of the arm or handle F = 464.1
Weight or load Q = 11023.1
Pitch distance or lead of thread in one turn P = 0.2
Pitch radius of screw r = 0.8
lever-arm radius R = 2.0
Motor speed N = 1400.0
Linier speed v = 15.7
Length of moving L = 39.4
Rotation of Screw N1 66.7
Gear Ration Rt 21.0
Time of rotaion t = 2.5
1.2 The effort force for a screw jack when neglecting friction can be expressed as
F = 210.526 kg
Doc. No :
W.O :
Revision No : B
Sheet : 1
lb 210.526 kg.mm 0.210526 kg.m
lb 5000 kg
in 6 mm
in 20 mm
in 50 mm
rpm
in/m 400 mm/m
in 1000 mm
rpm
menit
allowable stress : 2/3 of yield strength or about 1/4 of ultimate tensile strength
Ultimate tensile strength, 58-80ksi 400-550 MPa
Yield point, min., 36 KSI 250MPa
Source(s):
ASME II Part A
166.6667
SCREW JACKS CALCULATION
1. Calculate screw jacks effort force
1.1 Design Condition
Weight or load Q = 29.4
Lifting Screw lead Ls = 1000.0
Pitch distance or lead of thread in one turn P = 8.0
Time of rotaion t = 2.5
Raise Rate P = 400.0
Rotation of Screw N = 50.0
Rotation of Motor Nm = 1400.0
Gear Ration Rt = 28.0
1.2 Operating Input Power
Input Power = 0.7
1.3 Operating Input Torque
Input Torque = 136.1
1.4 Actuator Start-Up Torque
Start-Up Torque = 6.4
Doc. No :
W.O :
Revision No : B
Sheet : 1
Kn 3000 kg
mm
mm
menit
mm/M
rpm
rpm
Kw
Nm
Nm
allowable stress : 2/3 of yield strength or about 1/4 of ultimate tensile strength
Ultimate tensile strength, 58-80ksi 400-550 MPa
Yield point, min., 36 KSI 250MPa
Source(s):
166.6667

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