Machine Design - II (ME 308 Lab)
Shaft Design - Project # 1
Steps # 1 & 2
P is power in HP
n is speed in rpm
T is torque in lb.in. from above
r is the radius of the pulley in inches
|Tangential force on the gear Ft = T1-T2 lb.
Radial force on the gear Fr = Ft Tan f lb.
f is the pressure angle = 20°
Resultant reaction is given by
. Eqn. (11-9)
FR is the Catalog Load Rating
FD is the Design Load*
LD is the Design Life in Hours = 25000 Hrs.
nD is the Design Speed (given in rpm)
LRnR is the Rated Life = 106 rev.
R is the Reliability = 95%
a for Ball Bearings = 3
* for the values of FD, use the values of the resultant reactions calculated for locations B & D in step 5 of the lab-sheet, i.e. RB & RD
C=A.F. ´ FR
A.F. is the Load-Application Factor - use table (11-6)