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Contents of the Friction Devices PDF

List of 27 Friction Devices Formulas

Efficiency of Screw Jack when Screw Friction as well as Collar Friction Considered

Efficiency of Screw Jack when only Screw Friction is Considered

Force at Circumference of Screw given Helix Angle and Coefficient of Friction

Force at Circumference of Screw given Helix Angle and Limiting Angle

Force Required to Lower Load by Screw Jack given Weight of Load

Force Required to Lower Load by Screw Jack given weight of load and Limiting angle

Frictional Torque on Conical Pivot Bearing by Uniform Pressure

Frictional Torque on Conical Pivot Bearing by Uniform Wear

Frictional Torque on Flat Pivot Bearing by Uniform Pressure

Frictional Torque on Truncated Conical Pivot Bearing by Uniform Pressure

Helix Angle

Helix Angle for Multi-Threaded Screw

Helix Angle for Single Threaded Screw

Ideal Effort to Raise Load by Screw Jack

Lead of Screw

Maximum Efficiency of Screw Jack

Mean Radius of Collar

Pressure over Bearing Area of Flat Pivot Bearing

Torque Required to Overcome Friction at Collar

Torque Required to Overcome Friction between Screw and Nut

Torque Required to Overcome Friction between Screw and Nut during Lowering Load

Torque Required to Overcome Friction between Screw and Nut while Lowering Load

Total Frictional Torque on Conical Pivot Bearing Considering Uniform Pressure

Total Frictional Torque on Conical Pivot Bearing Considering Uniform Wear when Slant Height of Cone

Total Frictional Torque on Flat Pivot Bearing Considering Uniform Wear

Total Frictional Torque on Truncated Conical Pivot Bearing Considering Uniform Wear

Total Vertical Load Transmitted to Conical Pivot Bearing for Uniform Pressure

Variables used in Friction Devices PDF

C Circumference of Screw (Meter)
d Mean Diameter of Screw (Meter)
D_shaft Shaft Diameter (Meter)
F Force Required (Newton)
h_Slant Slant Height (Meter)
L Lead of Screw (Meter)
n Number of Threads
p_i Pressure Intensity (Pascal)
P_o Ideal Effort (Newton)
P_screw Pitch (Meter)
R Radius of Bearing Surface (Meter)
r₁ Outer Radius of Bearing Surface (Meter)
R₁ Outer Radius of Collar (Meter)
r₂ Inner Radius of Bearing Surface (Meter)
R₂ Inner Radius of Collar (Meter)
R_collar Mean Radius of Collar (Meter)
T Total Torque (Newton Meter)
W Weight (Kilogram)
W_load Load (Newton)
W_t Load Transmitted Over Bearing Surface (Newton)
α Semi Angle of Cone (Radian)
η Efficiency
μ_collar Coefficient of Friction for Collar
μ_friction Coefficient of Friction
Φ Limiting Angle of Friction (Degree)
ψ Helix Angle (Degree)
ψ Helix Angle (Degree)

Constants, Functions and Measurements used in Friction Devices PDF

Constant: pi, 3.14159265358979323846264338327950288
Archimedes' constant
Function: atan, atan(Number)
Inverse tan is used to calculate the angle by applying the tangent ratio of the angle, which is the opposite side divided by the adjacent side of the right triangle.
Function: cos, cos(Angle)
Cosine of an angle is the ratio of the side adjacent to the angle to the hypotenuse of the triangle.
Function: cosec, cosec(Angle)
The cosecant function is a trigonometric function that is the reciprocal of the sine function.
Function: sec, sec(Angle)
Secant is a trigonometric function that is defined ratio of the hypotenuse to the shorter side adjacent to an acute angle (in a right-angled triangle); the reciprocal of a cosine.
Function: sin, sin(Angle)
Sine is a trigonometric function that describes the ratio of the length of the opposite side of a right triangle to the length of the hypotenuse.
Function: tan, tan(Angle)
The tangent of an angle is a trigonometric ratio of the length of the side opposite an angle to the length of the side adjacent to an angle in a right triangle.
Measurement: Length in Meter (m)
Length Unit Conversion
Measurement: Weight in Kilogram (kg)
Weight Unit Conversion
Measurement: Pressure in Pascal (Pa)
Pressure Unit Conversion
Measurement: Force in Newton (N)
Force Unit Conversion
Measurement: Angle in Degree (°), Radian (rad)
Angle Unit Conversion
Measurement: Torque in Newton Meter (N*m)
Torque Unit Conversion

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