Machine Design - II (ME 308 Lab)
Shaft Design - Project # 1
Term 992
Steps # 1 & 2
lb.in. |
Where:
P is power in HP
n is speed in rpm
Where: T is torque in lb.in. from above r is the radius of the pulley in inches |
Tangential force on the gear F_{t} = T_{1}-T_{2} lb. Radial force on the gear F_{r} = F_{t} Tan f lb. |
Where: f is the pressure angle = 20° |
Resultant reaction is given by
lb.
………………. Eqn. (11-9)
Where:
F_{R} is the Catalog Load Rating
F_{D} is the Design Load*
L_{D} is the Design Life in Hours = 25000 Hrs.
n_{D} is the Design Speed (given in rpm)
L_{R}n_{R} is the Rated Life = 10^{6} rev.
R is the Reliability = 95%
a for Ball Bearings = 3
* for the values of F_{D}, use the values of the resultant reactions calculated for locations B & D in step 5 of the lab-sheet, i.e. R_{B} & R_{D}
C=A.F. ´ F_{R}
Where:
A.F. is the Load-Application Factor - use table (11-6)
NOTE: