Machine Design - II (ME 308 Lab)
Shaft Design - Project # 1
Steps # 1 & 2
P is power in kW
n is shaft speed in rpm
P is power (kW)
n t is pitch line velocity = 3.37 m/sec.
Wt is the transmitted load (N.)
f is the pressure angle of the gears = 20°
Resultant reaction is given by
Use Eqn. (11-9)
FR is the Catalog Load Rating
FD is the Design Load*
LD is the Design Life in Hours = 20000 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 all 4 locations in step 5 of the lab-sheet
C=A.F. ´ FR
A.F. is the Load-Application Factor - use table (11-6)