Maintenance Technology May 2015 - (Page 31)
BEARING SECRETS
Temperatures - deg C
-40
20
40
100
80
60
HONEY
9300
120
VI = 95
2000
1000
4650
68
32
2317
927
MINIMUM SUGGESTED VISCOSITIES
0
463
500
ISO OIL SPECS
46
100
200
150 220 320 460
100
ROLLER THRUST BRGS
232
CYLINDRICAL, SPHERICAL,
AND TAPERED ROLLER BRGS
100
20
BALL BEARINGS
59
10
50
5
Does not apply under 50 rpm
Viscositiy - Centistokes (cSt)
Saybolt Viscosity - (SSU)
-20
2
32
ANTIFREEZE
THE LINES REPRESENT THE
SPECIFIED VISCOSITY RANGES.
-50
0
100
50
150
250
200
Temperatures - deg F
Fig. 1. A general guide to recommended viscosities for ball, roller and roller thrust bearings
Actual period = 8000 hours x Ft x Fc x Fm x Fv x Fp x Fb
= 8000 hours x 0.5 x 1.0 x 1.0 x 1.0 x 1.0 x 0.1 = 400 hours
Special Section
4000
3500
Bearing speed (rpm)
change the rate of oil separation, some operating conditions will require more oil than others.
Figures 2 and 3 reflect empirical charts developed
for and used successfully in setting up lubrication programs in several large manufacturing plants and paper
mills. (Note: These charts were not the result of laboratory research, but substantial trial and error.)
The information in Fig. 2 can help determine basic
re-greasing intervals for ball and roller bearings. The
five curves on the chart are for five different bearing
bores (shaft diameters). The approach is to use the shaft
speed and diameter to define the basic interval.
Referring to Fig. 2, we can see that the suggested
re-greasing interval for a 3-in. diameter shaft rotating at
1750 rpm would be 8000 hours. That value, though, has
to be modified by the factors that correct for the actual
conditions surrounding the bearing, as shown in Fig. 3.
If that 3-in. (75 mm) shaft in Fig. 2 were horizontal,
had two spherical roller bearings on it and was running
at about 160 F (71 C) in a dry but slightly dusty environment with very low vibration, the corrected re-greasing
period would be found by multiplying the original 8000
hours by each of the correction factors as follows:
1" (25MM) BEARING
BORE
2" (50MM)
BORE
3" (75MM)
BORE
3000
4" (100MM)
BORE
2500
5" (125MM)
BORE
2000
1500
1000
500
1000
2000
4000
8000
16000
32000
64000
Suggested re-greasing period (operating hours)
Fig. 2. A simple guide to re-greasing intervals for bearings
Accordingly, if the referenced plant were running two eighthour shifts per day, five days per week, the example bearings
would need to be greased every five weeks, and would likely be
MAY 2015
LUBRICATION TECHNOLOGY
LubricationTechnologyOnline.com
31
http://www.LubricationTechnologyOnline.com
Maintenance Technology May 2015
Table of Contents for the Digital Edition of Maintenance Technology May 2015
Maintenance Technology May 2015 - Cover1
Maintenance Technology May 2015 - Cover2
Maintenance Technology May 2015 - 1
Maintenance Technology May 2015 - 2
Maintenance Technology May 2015 - 3
Maintenance Technology May 2015 - 4
Maintenance Technology May 2015 - 5
Maintenance Technology May 2015 - 6
Maintenance Technology May 2015 - 7
Maintenance Technology May 2015 - 8
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Maintenance Technology May 2015 - Cover3
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