LINEAR MOTION SYSTEMS
LINEAR MOTION SYSTEMS
LINEAR MOTION SYSTEMS
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Simplicity ® Ball Bearings<br />
Technical Information<br />
Linear Motion Systems<br />
FRICTIONAL RESISTANCE<br />
The static frictional resistance of the Simplicity ® linear system<br />
is so low that it is only slightly different from the kinetic<br />
frictional resistance, enabling smooth linear movement from<br />
low to high speeds. In general, the frictional resistance is<br />
expressed by the following equation.<br />
F = μ • W + f<br />
F : Frictional resistance<br />
W : Load weight<br />
μ : Coeffi cient of friction<br />
f : Sealing resistance<br />
The frictional resistance of each PBC linear system depends<br />
on the model, load weight, speed, and lubricant. The sealing<br />
resistance depends on the lip interference and lubricant,<br />
regardless of the load weight. The sealing resistance of one<br />
linear system is about 200 to 500 gf. The coefficient of friction<br />
depends on the load weight, moment load, and preload.<br />
TABLE 5 - COEFFICIENT OF <strong>LINEAR</strong> SYSTEM FRICTIONS (μ)<br />
<strong>LINEAR</strong> SYSTEM TYPE MODELS COEFFICIENT OF FRICTION (μ)<br />
Linear Bearing JP, EP, IP 0.002 to 0.003<br />
AMBIENT WORKING TEMPERATURE<br />
The ambient working temperature range for each PBC linear<br />
system depends on the model. Consult PBC on use outside<br />
the recommended temperature range.<br />
Temperature conversion equation:<br />
C = 9 5 (F - 32) F = 32 + 5<br />
9 C<br />
TABLE 6 - AMBIENT WORKING TEMPERATURE<br />
<strong>LINEAR</strong> SYSTEM TYPE<br />
MODELS<br />
AMBIENT WORKING<br />
TEMPERATURE<br />
Linear Bushing JP, EP, IP -20 to 80°C, 176°F<br />
LUBRICATION AND DUST PREVENTION<br />
Using PBC linear systems without lubrication increases the<br />
abrasion of the rolling elements, shortening the life span. The<br />
PBC linear systems therefore require appropriate lubrication.<br />
For lubrication PBC recommends turbine oil conforming to<br />
ISO Standards G32 to G68 or lithium base soap grease No.2.<br />
Some PBC linear systems are sealed to block dust out and<br />
seal lubricant in. If used in a harsh or corrosive environment<br />
a protective cover should be used.<br />
Technical Information<br />
The data and specifi cations in this publication have been carefully compiled and are believed to be accurate and correct. However, it is the responsibility of the user to<br />
determine and ensure the suitability of Pacifi c Bearing® products for a specifi c application. Pacifi c Bearing’s only obligation will be to repair or replace without charge,<br />
any defective components if returned promptly. No liability is assumed beyond such replacement. *Consult www.pacifi c-bearing.com for the latest technical updates.<br />
800.962.8979 • www.pacific-bearing.com 91
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