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Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Formula

GoCoefficient of Friction of Screw Thread given Load Formula

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Coefficient of friction at screw thread is the ratio defining the force that resists the motion of the nut in relation to the threads in contact with it. Check FAQs

μ = \frac{2 \cdot Mt lo + W \cdot d m \cdot \tan (α)}{W \cdot d m - 2 \cdot Mt lo \cdot \tan (α)}

μ - Coefficient of friction at screw thread?Mt_lo - Torque for lowering load?W - Load on screw?d_m - Mean Diameter of Power Screw?α - Helix angle of screw?

Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Example

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Here is how the Coefficient of Friction of Screw Thread given Torque Required in Lowering Load equation looks like with Values.

Here is how the Coefficient of Friction of Screw Thread given Torque Required in Lowering Load equation looks like with Units.

Here is how the Coefficient of Friction of Screw Thread given Torque Required in Lowering Load equation looks like.

0.1553 = \frac{2 \cdot 2960 + 1700 \cdot 46 \cdot \tan (4.5)}{1700 \cdot 46 - 2 \cdot 2960 \cdot \tan (4.5)}

0.1553 = \frac{2 \cdot 2960N*mm + 1700N \cdot 46mm \cdot \tan (4.5°)}{1700N \cdot 46mm - 2 \cdot 2960N*mm \cdot \tan (4.5°)}

0.1553 = \frac{2 \cdot 2960 + 1700 \cdot 46 \cdot \tan (4.5)}{1700 \cdot 46 - 2 \cdot 2960 \cdot \tan (4.5)}

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Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Solution

Follow our step by step solution on how to calculate Coefficient of Friction of Screw Thread given Torque Required in Lowering Load?

FIRST Step Consider the formula

μ = \frac{2 \cdot Mt lo + W \cdot d m \cdot \tan (α)}{W \cdot d m - 2 \cdot Mt lo \cdot \tan (α)}

Next Step Substitute values of Variables

∴

μ = \frac{2 \cdot 2960N*mm + 1700N \cdot 46mm \cdot \tan (4.5°)}{1700N \cdot 46mm - 2 \cdot 2960N*mm \cdot \tan (4.5°)}

Next Step Convert Units

∴

μ = \frac{2 \cdot 2.96N*m + 1700N \cdot 0.046m \cdot \tan (0.0785rad)}{1700N \cdot 0.046m - 2 \cdot 2.96N*m \cdot \tan (0.0785rad)}

Next Step Prepare to Evaluate

∴

μ = \frac{2 \cdot 2.96 + 1700 \cdot 0.046 \cdot \tan (0.0785)}{1700 \cdot 0.046 - 2 \cdot 2.96 \cdot \tan (0.0785)}

Next Step Evaluate

∴

μ = 0.155330487707809

LAST Step Rounding Answer

∴

μ = 0.1553

Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Formula Elements

Variables

Functions

Coefficient of friction at screw thread

Coefficient of friction at screw thread is the ratio defining the force that resists the motion of the nut in relation to the threads in contact with it.

Symbol: μ

Measurement: NAUnit: Unitless

Note: Value should be between 0 to 1.

Formulas to find Coefficient of friction at screw thread

Torque for lowering load

Torque for lowering load is described as the turning effect of force on the axis of rotation that is required in lowering the load.

Symbol: Mt_lo

Measurement: TorqueUnit: N*mm

Note: Value should be greater than 0.

Formulas to find Torque for lowering load

Load on screw

Load on screw is defined as the weight (force) of the body that is acted upon the screw threads.

Symbol: W

Measurement: ForceUnit: N

Note: Value should be greater than 0.

Formulas to find Load on screw

Mean Diameter of Power Screw

Mean Diameter of Power Screw is the average diameter of the bearing surface - or more accurately, twice the average distance from the centreline of the thread to the bearing surface.

Symbol: d_m

Measurement: LengthUnit: mm

Note: Value should be greater than 0.

Formulas to find Mean Diameter of Power Screw

Helix angle of screw

Helix angle of screw is defined as the angle subtended between this unwound circumferential line and the pitch of the helix.

Symbol: α

Measurement: AngleUnit: °

Note: Value should be greater than 0.

Formulas to find Helix angle of screw

tan

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.

Syntax: tan(Angle)

Other Formulas to find Coefficient of friction at screw thread

Go Coefficient of Friction of Screw Thread given Load

μ = \frac{P lo + \tan (α) \cdot W}{W - P lo \cdot \tan (α)}

Other formulas in Torque Requirement in Lowering Load using Square threaded Screws category

Go Effort Required in Lowering Load

P lo = W \cdot (\frac{μ - \tan (α)}{1 + μ \cdot \tan (α)})

Go Load on power Screw given Effort Required in Lowering Load

W = \frac{P lo}{\frac{μ - \tan (α)}{1 + μ \cdot \tan (α)}}

Go Helix Angle of Power Screw given Effort Required in Lowering Load

α = a \tan (\frac{W \cdot μ - P lo}{μ \cdot P lo + W})

Go Torque Required in Lowering Load on Power Screw

Mt lo = 0.5 \cdot W \cdot d m \cdot (\frac{μ - \tan (α)}{1 + μ \cdot \tan (α)})

How to Evaluate Coefficient of Friction of Screw Thread given Torque Required in Lowering Load?

Coefficient of Friction of Screw Thread given Torque Required in Lowering Load evaluator uses Coefficient of friction at screw thread = (2*Torque for lowering load+Load on screw*Mean Diameter of Power Screw*tan(Helix angle of screw))/(Load on screw*Mean Diameter of Power Screw-2*Torque for lowering load*tan(Helix angle of screw)) to evaluate the Coefficient of friction at screw thread, Coefficient of Friction of Screw Thread given Torque Required in Lowering Load formula is defined as the ratio of the force required to move two sliding surfaces over each other, and the force holding them together. It is the ratio of the tangential force that is needed to start or to maintain uniform relative motion between two contacting surfaces to the perpendicular force holding them in contact, the ratio usually being larger for starting than for moving friction. Coefficient of friction at screw thread is denoted by μ symbol.

How to evaluate Coefficient of Friction of Screw Thread given Torque Required in Lowering Load using this online evaluator? To use this online evaluator for Coefficient of Friction of Screw Thread given Torque Required in Lowering Load, enter Torque for lowering load (Mt_lo), Load on screw (W), Mean Diameter of Power Screw (d_m) & Helix angle of screw (α) and hit the calculate button.

FAQs on Coefficient of Friction of Screw Thread given Torque Required in Lowering Load

What is the formula to find Coefficient of Friction of Screw Thread given Torque Required in Lowering Load?

The formula of Coefficient of Friction of Screw Thread given Torque Required in Lowering Load is expressed as Coefficient of friction at screw thread = (2*Torque for lowering load+Load on screw*Mean Diameter of Power Screw*tan(Helix angle of screw))/(Load on screw*Mean Diameter of Power Screw-2*Torque for lowering load*tan(Helix angle of screw)). Here is an example- 0.15533 = (2*2.96+1700*0.046*tan(0.0785398163397301))/(1700*0.046-2*2.96*tan(0.0785398163397301)).

How to calculate Coefficient of Friction of Screw Thread given Torque Required in Lowering Load?

With Torque for lowering load (Mt_lo), Load on screw (W), Mean Diameter of Power Screw (d_m) & Helix angle of screw (α) we can find Coefficient of Friction of Screw Thread given Torque Required in Lowering Load using the formula - Coefficient of friction at screw thread = (2*Torque for lowering load+Load on screw*Mean Diameter of Power Screw*tan(Helix angle of screw))/(Load on screw*Mean Diameter of Power Screw-2*Torque for lowering load*tan(Helix angle of screw)). This formula also uses Tangent (tan) function(s).

What are the other ways to Calculate Coefficient of friction at screw thread?

Here are the different ways to Calculate Coefficient of friction at screw thread-

Coefficient of friction at screw thread=(Effort in lowering load+tan(Helix angle of screw)*Load on screw)/(Load on screw-Effort in lowering load*tan(Helix angle of screw))

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Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Formula

​GoCoefficient of Friction of Screw Thread given Load Formula

Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Example

Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Solution

Coefficient of Friction of Screw Thread given Torque Required in Lowering Load Formula Elements

Other Formulas to find Coefficient of friction at screw thread

Other formulas in Torque Requirement in Lowering Load using Square threaded Screws category

How to Evaluate Coefficient of Friction of Screw Thread given Torque Required in Lowering Load?

FAQs on Coefficient of Friction of Screw Thread given Torque Required in Lowering Load

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GoCoefficient of Friction of Screw Thread given Load Formula