V-Ribbed Belts Table 28. Length Correction Factors Machinery's Handbook, 31st Edition
2596
Cross Section
Cross Section
Std. Length Designation
Std. Length Designation
J
L
M
J
L
M
180 200 240 280 320 360 400 440 500 550 610 690 780 910 940 990
0.83 0.85 0.89 0.92 0.95 0.98 1.00 1.02 1.05 1.07 1.09 1.12 1.16 1.18 1.19 1.20
… … 1230 … … 1310 … … 1470 … … 1610 … … 1830 … … 1980 … … 2130 … … 2410
… 1.08 … 1.10 … 1.14 … 1.17 … 1.19 … 1.21 … 1.24
0.94 0.96 1.00 1.03 1.05 1.06 1.09
… 1.12 0.098
0.89 0.91 0.93 0.96 0.98 1.02 1.02 1.04
… 2710 … 3010 … 3310 … 3610 … 3910
… … 1.12 … … 1.14 … … 1.16 … … 1.18 … … 1.20 … … 1.22 … … 1.25 … … 1.28 … … 1.30
0.88 0.89 0.90 0.91 0.93
4210 4810 5410 6000
1060 1150
… 1.05 … 1.07
… … … …
Table 29. Arc of Contact Correction Factors
C D d o o −
Arc of Contact, θ , on Small Sheave, (deg)
Correction Factor
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50
180 174 169 163 157 151 145 139 133 127 120 113 106
1.00 0.98 0.97 0.95 0.94 0.92 0.90 0.88 0.85 0.83 0.80 0.77 0.74 0.71 0.67
99 91 83
0.63 Number of Ribs: The number of ribs required for an application is obtained by dividing the design horsepower by the corrected horsepower rating for one rib. Arc of contact on the small sheave may be determined by the following formulas: Exact Formula: cos C D d 2 2 Arc of Contact (deg) o o 1 = − − a k Approximate Formula: C D d 180 60 Arc of Contact (deg) o o = − − ^ h
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