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   17.5.5.C Sliding Speed Factor, Kv   
   The sliding speed factor is obtainable from Figure 17-14, where the abscissa is the pitch line linear velocity.
  17.5.5.D Rotating  Speed Factor, Kn 
   The rotating speed factor is presented in Figure 17-15 as a function of the worm gear's rotating speed, n2.		    17.5.5.E Lubricant Factor, ZL 
   Let ZL = 1.0 if the lubricant is of proper viscosity and has antiscoring additives.
   Some bearings in worm gear boxes may need a low viscosity lubricant. Then ZL is to be less than 1.0. The recommended kinetic viscosity of lubricant is given in Table 17-29.

Table 17-29 Recommended Kinematic Viscosity of Lubricant               Unit: cSt/37.8ºC
Operating lubricant Temperature Sliding Speed (m/s)
Highest Operating Temperature Lubricant Temperature at Start of Operation Less than 2.5 2.5 to 5 More than 5
0ºC to less than 10ºC -10ºC ... 0ºC 110 ... 130 110 ... 130 110 ... 130
more than 0ºC 110 ... 150 110 ... 150 110 ... 150
10ºC to less than 30ºC more than 0ºC 200 ... 245 150 ... 200 150 ... 200
30ºC to less than 55ºC more than 0ºC 350 ... 510 245 ... 350 200 ... 245
55ºC to less than 80ºC more than 0ºC 510 ... 780 350 ... 510 245 ... 350
80ºC to less than 100ºC more than 0ºC 900 ... 1100 510 ... 780 350 ... 510

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