Unit Bearing Pressure Calculator

✖Force on Unit is any interaction that, when unopposed, will change the motion of an object. In other words, a force can cause an object with mass to change its velocity.ⓘ Force on Unit [F]			+10% -10%
✖Number of Threads is total no. of threads in a screw.ⓘ Number of Threads [n]			+10% -10%
✖Nominal Diameter is the actual diameter of the screw.ⓘ Nominal Diameter [d_n]			+10% -10%
✖Core Diameter is defined as the smallest diameter of the thread of the screw or nut. The term “minor diameter” replaces the term “core diameter” as applied to the thread of a screw.ⓘ Core Diameter [D_c]			+10% -10%

✖Unit Bearing Pressure is the average pressure acting on the contact surface of the thread in a Screw-Nut pair.ⓘ Unit Bearing Pressure [S_b]

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Formula

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Unit Bearing Pressure

Formula

`"S"_{"b"} = (4*"F")/(pi*"n"*("d"_{"n"}^2-"D"_{"c"}^2))`

Example

`"61.21344Pa"=(4*"0.0002kN")/(pi*"16"*(("18mm")^2-("8mm")^2))`

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Unit Bearing Pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

Unit Bearing Pressure = (4*Force on Unit)/(pi*Number of Threads*(Nominal Diameter^2-Core Diameter^2))
S_b = (4*F)/(pi*n*(d_n^2-D_c^2))
This formula uses 1 Constants, 5 Variables

Constants Used

pi - Archimedes' constant Value Taken As 3.14159265358979323846264338327950288

Variables Used

Unit Bearing Pressure - (Measured in Pascal) - Unit Bearing Pressure is the average pressure acting on the contact surface of the thread in a Screw-Nut pair.
Force on Unit - (Measured in Newton) - Force on Unit is any interaction that, when unopposed, will change the motion of an object. In other words, a force can cause an object with mass to change its velocity.
Number of Threads - Number of Threads is total no. of threads in a screw.
Nominal Diameter - (Measured in Meter) - Nominal Diameter is the actual diameter of the screw.
Core Diameter - (Measured in Meter) - Core Diameter is defined as the smallest diameter of the thread of the screw or nut. The term “minor diameter” replaces the term “core diameter” as applied to the thread of a screw.

STEP 1: Convert Input(s) to Base Unit

Force on Unit: 0.0002 Kilonewton --> 0.2 Newton (Check conversion here)
Number of Threads: 16 --> No Conversion Required
Nominal Diameter: 18 Millimeter --> 0.018 Meter (Check conversion here)
Core Diameter: 8 Millimeter --> 0.008 Meter (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

S_b = (4*F)/(pi*n*(d_n^2-D_c^2)) --> (4*0.2)/(pi*16*(0.018^2-0.008^2))

Evaluating ... ...

S_b = 61.213439650729

STEP 3: Convert Result to Output's Unit

61.213439650729 Pascal --> No Conversion Required

FINAL ANSWER

61.213439650729 ≈ 61.21344 Pascal <-- Unit Bearing Pressure

(Calculation completed in 00.004 seconds)

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Created by Akshay Talbar

Vishwakarma University (VU), Pune

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National Institute Of Technology (NIT), Hamirpur

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< 9 Pressure Calculators

Unit Bearing Pressure in Terms of Sommerfeld Number of Bearing

Go Unit bearing pressure for bearing = (((Radius of Journal/Radial clearance for bearing)^2)*Dynamic Viscosity of Lubricant*Journal Speed)/(2*pi*Sommerfeld Number of Journal Bearing)

Pressure Difference in Terms of Flow of Lubricant

Go Pressure difference between slot sides = Length of slot in direction of flow*12*Dynamic Viscosity of Lubricant*Flow of lubricant from slot/((Oil film thickness^3)*Breadth of slot for oil flow)

Unit Bearing Pressure in Terms of Temperature Rise Variable

Go Unit bearing pressure for bearing = Density of Lubricating Oil*Specific heat of bearing oil*Temperature rise of bearing lubricant/Temperature Rise Variable

Unit Bearing Pressure

Go Unit Bearing Pressure = (4*Force on Unit)/(pi*Number of Threads*(Nominal Diameter^2-Core Diameter^2))

Pressure of Lubricating Oil in Recess in Terms of Load acting on Bearing

Go Pressure of Lubricating Oil = Load Acting on Sliding Bearing/(Total Projected Area of Bearing Pad*Load coefficient for bearing)

Outlet Pressure in Terms of Pumping Power

Go Outlet Pressure for Bearing = Inlet Pressure for Bearing-(Pumping Power for Bearing/Flow of lubricant from step bearing)

Inlet Pressure in Terms of Pumping Power

Go Inlet Pressure for Bearing = Outlet Pressure for Bearing+(Pumping Power for Bearing/Flow of lubricant from step bearing)

Unit Bearing Pressure in Terms of Radial Load Acting on Bearing

Go Unit bearing pressure for bearing = Radial load acting on sliding bearing/(Axial Length of Bearing*Journal Diameter)

Pressure of Lubricating Oil in Terms Pumping Power

Go Pressure of Lubricating Oil = Pumping Power for Bearing/Flow of lubricant from step bearing

Unit Bearing Pressure Formula

Unit Bearing Pressure = (4*Force on Unit)/(pi*Number of Threads*(Nominal Diameter^2-Core Diameter^2))
S_b = (4*F)/(pi*n*(d_n^2-D_c^2))

What is unit bearing pressure ?

Unit bearing pressure is permissible bearing pressure which is in terms of force, teeth and area of contacting surface.

How to Calculate Unit Bearing Pressure?

Unit Bearing Pressure calculator uses Unit Bearing Pressure = (4*Force on Unit)/(pi*Number of Threads*(Nominal Diameter^2-Core Diameter^2)) to calculate the Unit Bearing Pressure, The unit bearing pressure is the bearing pressure of contacting surfaces of the screw and the nut. Unit Bearing Pressure is denoted by S_b symbol.

How to calculate Unit Bearing Pressure using this online calculator? To use this online calculator for Unit Bearing Pressure, enter Force on Unit (F), Number of Threads (n), Nominal Diameter (d_n) & Core Diameter (D_c) and hit the calculate button. Here is how the Unit Bearing Pressure calculation can be explained with given input values -> 61.21344 = (4*0.2)/(pi*16*(0.018^2-0.008^2)).

FAQ

What is Unit Bearing Pressure?

The unit bearing pressure is the bearing pressure of contacting surfaces of the screw and the nut and is represented as S_b = (4*F)/(pi*n*(d_n^2-D_c^2)) or Unit Bearing Pressure = (4*Force on Unit)/(pi*Number of Threads*(Nominal Diameter^2-Core Diameter^2)). Force on Unit is any interaction that, when unopposed, will change the motion of an object. In other words, a force can cause an object with mass to change its velocity, Number of Threads is total no. of threads in a screw, Nominal Diameter is the actual diameter of the screw & Core Diameter is defined as the smallest diameter of the thread of the screw or nut. The term “minor diameter” replaces the term “core diameter” as applied to the thread of a screw.

How to calculate Unit Bearing Pressure?

The unit bearing pressure is the bearing pressure of contacting surfaces of the screw and the nut is calculated using Unit Bearing Pressure = (4*Force on Unit)/(pi*Number of Threads*(Nominal Diameter^2-Core Diameter^2)). To calculate Unit Bearing Pressure, you need Force on Unit (F), Number of Threads (n), Nominal Diameter (d_n) & Core Diameter (D_c). With our tool, you need to enter the respective value for Force on Unit, Number of Threads, Nominal Diameter & Core Diameter and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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