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

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