PROBLEM: A MOTOR IS DRIVING A CENTRIFUGAL COMPRESSOR TROUGH A
6-IN, HEAVY, SINGLE-PLY LEATHER BELT IN A DUSTY LOCATION. THE 8-IN
MOTOR PULLEY TURNS 1750 RPM;D2=12 IN. (COMPRESSOR SHAFT); C=5 FT.
THE BELT HAS BEEN DESIGNED FOR A NETBELT PULL OF F1- F2=40 LB/IN OF
WIDTH AND F1/F2=3. COMPUTE (a) THEHORSEPOWER, (b) THE STRESS IN
TIGHT SIDE. (c) FOR THIS STRESS, WHAT NEEDEDVALUE OF f IS INDICATED
BY THE GENERAL BELT EQUATION? (d) CONSIDERING THEORIGINAL DATA WHAT
HORSEPOWER IS OBTAINED FROM ALBA TABLES? ANYREMARKS?
MECHANICAL NOTES:1) FROM TABLE 17.1 (FOR HEAVY, SINGLE - PLY
LEATHER BELT WHERE t = 13/64 IN. ISUSED). FROM D.M.E. 4TH EDITION
BY FAIRES AT PAGE 450.2) = 0.035 LB/CU. IN. (FOR LEATHER IS USED).
FROM D.M.E. 4TH EDITIONBY FAIRES AT PAGE 444.3) EQ. 17.2 IS USED.
FROM D.M.E. 4TH EDITION BY FAIRES AT PAGE 444.4) EQ. 17.4 IS USED.
FROM D.M.E. 4TH EDITION BY FAIRES AT PAGE 447.5) EQ. i IS USED.
FROM D.M.E. 4TH EDITION BY FAIRES AT PAGE 449.6) FROM TABLE 17.1
& 17.2 ARE USED IN FINDING THE HORSEPOWER (HP) IN ALBATABLES.
FROM D.M.E. 4TH EDITION BY FAIRES AT PAGE 450.7) TOLERANCES ARE
0.010.
SUMMARY:b = 6 IN. C = 5 FT. = 60 IN. S = 295. 38 PSI
=3.074925987 RAD
D1 = 8 IN. x = 6.97 HP/IN. Vs = 61.09 FPS f = 0.520500895 D2 =
12 IN. HP = 26.66 HP F1 = 360 LB.
