Bolt Tightening of a Shaft Mounted Lever | Online Calculator

Bolt Connection Calculators







Bolt Tightening of a Shaft Mounted Lever

In this calculation, a lever with a length L mounted on a shaft with a diameter D is considered. The lever is under the action of a force P and is kept from turning by the frictional force created by the torque of the fastening bolt, located at a distance l1 from the shaft axis. As a result of calculations, the tightening force F ensuring the operability of the connection is determined.

For the calculation, the friction coefficient of the contacted surfaces μ should be specified.

The tightening torque of the thread can be calculated here.

Tightening Force of the Lever Under Torque
Calculation of Tightening Force of the Lever Under Torque

INITIAL DATA

D - Shaft diameter;


l1 - Distance from the shaft axis to the bolt;


L - Distance from the shaft axis to the load P;


P - Load;


μ - Coefficient of friction on the clamping surface.

RESULTS DATA

F - Tightening force.

Diameter (D)

Distance (l1)

Lever (L)

Load (P)

Friction coefficient (μ)

Tightening force (F)

BASIC FORMULAS

Tightening force:

F = 1.2*P*L / μ(2l1 + D)

INITIAL DATA

D - Shaft diameter;


l1 - Distance from the shaft axis to the bolt;


L - Distance from the shaft axis to the load P;


P - Load;


μ - Coefficient of friction on the clamping surface.

RESULTS DATA

F - Tightening force.

COEFFICIENTS OF FRICTION

Friction contact materials

Surface conditions

Friction coefficient

Steel-Steel

Dry

0.15

Greased

0.11

Steel – Cast iron

Dry

0.3

Steel - Copper

Dry

0.36

Greased

0.19

Steel - Bronze

Dry

0.12

Greased

0.09

Steel - Brass

Dry

0.35

Greased

0.19

Steel - Titanium alloy

Dry

0.3÷0.7

Steel - Aluminium alloy

Dry

0.61

Bronze - Bronze

Greased

0.1

Cast iron - Bronze

Dry

0.22

Greased

0.08

Cast iron – Cast iron

Dry

1.1

Greased

0.1

Aluminium alloy - Aluminium alloy

Dry

1.2

Greased

0.3

Titanium alloy – Titanium alloy

Dry

0.5

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