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ThorPlas Engineering Manual - Thordon Bearings

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SYMBOLS AND UNITS<br />

THORPLAS ® BEARINGS ENGINEERING MANUAL<br />

Version TP2006.1A4<br />

SYMBOLS AND UNITS<br />

Units<br />

Metric Imperial<br />

Ct = Thermal Expansion<br />

Allowance mm inches<br />

Cs = Absorption Allowance mm inches<br />

d = Shaft Diameter mm inches<br />

Eo = Modulus of Elasticity MPa psi<br />

I.D. = Inside Diameter of Bearing mm inches<br />

O.D. = Outside Diameter of Bearing mm inches<br />

L = Length of Bearing mm inches<br />

N = Shaft Speed R.P.M. R.P.M.<br />

P = Pressure MPa psi<br />

Ta = Machine Shop Ambient<br />

Temperature (Nominally<br />

21°C (70°F)) °C °F<br />

To = Operating Temperature °C °F<br />

W.T. = Wall Thickness of Bearing mm inches<br />

α = Coefficient of<br />

Thermal Expansion °C °F<br />

µ = Coefficient of Friction - -<br />

V = Velocity m/sec. ft./min.<br />

γ = Poisson’s Ratio<br />

FREEZE FIT COOLANT TEMPERATURES<br />

Dry Ice: -78°C (-109°F)<br />

Liquid Nitrogen: -196°C (-320°F)<br />

Note: All clearances referred to in this manual are diametrical clearances.<br />

METRIC CONVERSION TABLE<br />

• Length<br />

• Force<br />

• Pressure<br />

1 Metre (m) = 39.37 Inches (in.)<br />

1 Millimetre (mm) = 0.03937 Inches (in.)<br />

1 Newton (N) = 0.2248 lbs.<br />

1 Kilogram (kg) = 2.205 lbs.<br />

* 1 kg/cm 2 = 14.223 psi (lbs./in. 2 )<br />

** 1 Mega Pascal (MPa) = 145 psi (lbs./in. 2 )<br />

1 N/mm 2 = 145 psi (lbs./in. 2 ) = 1 MPa<br />

1 MPa = 10.195 kgf/cm 2<br />

1 Bar = .981 kg/cm 2<br />

1 Mega Pascal (MPa) = 10 Bar<br />

* Kilo = 1,000<br />

** Mega = 1,000,000<br />

APPROXIMATE COMPARISON OF<br />

VARIOUS HARDNESS SCALES<br />

OTHER THORDON<br />

TECHNICAL INFORMATION AVAILABLE<br />

a) <strong>Thordon</strong> <strong>Engineering</strong> <strong>Manual</strong><br />

(for <strong>Thordon</strong> elastomeric bearings)<br />

b) <strong>Thordon</strong> Bearing Sizing Calculation Program<br />

Please contact your local <strong>Thordon</strong> Distributor or<br />

<strong>Thordon</strong> <strong>Bearings</strong> Inc. if you require any of the above.<br />

<strong>ThorPlas</strong>® is a registered trademark owned by <strong>Thordon</strong> <strong>Bearings</strong> Inc.

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