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Work Holding Toggle Mechanism Calculations

Machine Design Application, Equations and Calculators

Work Holding Clamping Toggle Mechanisms Calculations

Basic lever arm clamp design with forces applied and reaction forces calculator.

Preview: Work Holding Clamping Toggle Mechanisms Calculator

Eq. 1
Q = P [ ( l + r · f_o ) / ( l₁ - r · f_o ) ]

Eq. 2
P = Q / [ ( l + r · f_o ) / ( l₁ - r · f_o ) ]

Figure 1
Basic lever arm clamp design

Where:

Q = force applied to handle. lbf, (N)
P = clamping force, lbf. (N)
f_o = coefficient of friction (axles and pivot pins) = 0.1 to 0.15
l, l₁ = length as indicated. in, (mm)
r = radius of pivot hole. in, (mm)

Reference:

Handbook of Machining and Metalworking Calculations
Ron A. Walsh
​2001

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