Bearing capacity is measured by PV and will determine
the amount of heat generated in a plane bearing. PV is
the relationship of the load to the shaft speed in a bearing.
Factors influencing PV limits (heat generation) include:
- material selection
- journal surface finish
- bearing wall thickness
- running clearance
- proximity to moisture
- ambient temperature
- cycle time
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HOW TO CALCULATE PV
PV - P x V
P - pressure in PSI (lbs./sq. in.)
V - velocity in SFM (surface ft./min.)
P - F/A
where F = force (load) on bearing
A = shaft dia (in.) x LTB
(LTB = bearing length through the bore)
V - .262 x D x RPM
where D = shaft diameter (in.)
RPM = shaft revolutions/min.
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ALL-ROUND®S OFFER INSTALLATION VERSATILITY
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All-Round® Supreme bearings can be either
horizontally or vertically mounted.
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They also can be assembled in different ways to adjust
the total length-thru-bore (LTB) of a mounted set.
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In any configuration, the locking sleeve collar must run against the polymer bearing flange to prevent metal-to-metal contact
and heat buildup. (Full mounting and installation instructions for all EDT bearings is in
User Handbook, Section U-PURPLE.)
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(1) PV limits are shown for unlubricated radial bearing applications.
Low temperature / submerged installation may permit PV limits up
to 2x higher. For high ambient temperatures, calculated PV’s must
be reduced.
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(2) Proper use of exclusionary seals can extend bearing life.
Forsheda V-rings can be effective with any of EDT’s plane
bearings.
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