ThorPlas Engineering Manual - Thordon Bearings
ThorPlas Engineering Manual - Thordon Bearings
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.