Plain Bearings Simplicity ®
Wear Rate/Life Expectancy The life expectancy of a Simplicity bearing is dependent on application parameters: • Shaft hardness, surface finish, and preparation • Length of travel • Temperature • Contamination • Running clearance • Lubrication • Speed The Radial Wear chart gives a guideline for a typical application at 10 psi (.703 kgf/cm 2 ) traveling at 100 ft./min. (30.48 m/min.).
RADIAL WEAR Meters of Travel (100,000)
635
1,270
1,905
2,540
3,175
.0025
.0635
TEST DATA: Operating conditions of 10 psi (.703 kgf/cm 2 ) 100 ft/min (30.48 m/min), 3/4" RC60 shafting
.0020
.0508
.0015
.0381
.0010
.0254
FrelonGOLD® Running Dry
.0005
.0127
0
25
50
75
125
100
Millions of Inches of Travel
Factors Affecting Wear Rate/Life Shafting requirements for Frelon ® bearing materials include: BEST PERFORMANCE:
• Finish of 8–12 Ra • Hardness of RC 60 ACCEPTABLE PERFORMANCE:
• Finish of 8–16 Ra • Hardness of RC 35 • Surface finish requirements apply to all Frelon bearing materials • Rougher shafting can be used, but both bearing and shafting will
>16 Ra or .40 µm
= 8-16 Ra or .20-.40 µm
< 8 Ra or .20 µm
wear at accelerated rates and binding may occur Note: Consult factory if using chrome plated shafting that is polished to < 8 Ra.
Cantilevered Loads • Maximum 2:1 ratio
2X MAX
• 1x = bearing separation on same shaft • 2x = distance from shaft to load or force Example: If 2x equals 10" then 1x must be at least 5"
Load or Force
1X
Binding will occur if the 2:1 ratio is exceeded.
2:1 Ratio Information
12 Round Shaft Technology • pbclinear.com
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