solution design
DESCRIPTION
Solution DesignTRANSCRIPT
Given Data:MATERIAL: AISI C3140 Mechanical Advantage = 4Force 1= 600lbsLength 1= 20 inSOLUTION:For solving F2:F1 = 600 lbs =
For solving L2: L1 = 20in
MATERIAL: AISI C3140From Page 571 Table AF1Sy= 58000 lbs
From Page 20Assuming mild shock, repeated, one direction:N=3 (Yield Strength)
Design Stress for Shear:
Design Stress for Tension and Compression:
A.TENSION ACROSS THE CIRCULAR SECTION JOINT A:
= =
For Standard Fraction: X =
Use
B. SHEAR BETWEEN ROD AND PIN
= =
For Standard Fraction: X =
Use
C. COMPRESSIVE STRESS BETWEEN PIN AND ROD
= =
For Standard Fraction: X =
Use D. COMPRESSIVE STRESS BETWEEN PIN AND YOKE = =
For Standard Fraction: x =
Use
E. ROD AND YOKE TENSION ACROSS THE PIN:
ROD: = =
YOKE: = =
For Standard Fraction: X =
Use: F. SHEARING STRESS ON THE LEVER:
= =
For Standard Fraction: X =
Use
G. THE PIN MAY TEAR AT THE END OF THE ROD OR YOKE:
= =
For Standard Fraction: x =
Use
ANALYZING JOINT B: A.TENSION ACROSS THE CIRCULAR SECTION AT JOINT B:
= =
For Standard Fraction: x =
B. SHEAR BETWEEN ROD AND PIN
= =
For Standard Fraction:
x =
Use
C. COMPRESSIVE STRESS BETWEEN PIN AND ROD
= =
For Standard Fraction: x =
Use
D. COMPRESSIVE STRESS BETWEEN PIN AND YOKE
= =
For Standard Fraction: x =
Use E. ROD AND YOKE TENSION ACROSS THE PIN:
= =
For Standard Fraction: x =
Use
= =
For Standard Fraction: X =
Use F. SHEARING STRESS ON THE LEVER:
= =
For Standard Fraction: x =
Use
G. THE PIN MAY TEAR AT THE END OF THE ROD OR YOKE:
= =
For Standard Fraction: x =
Use
ANALYZING JOINT C :
Shaft is subjected to torsional stress:
For Shaft Diameter:
=
For Standard Fraction: x =
Use
For Hub Diameter:For steel diameter hub, page 388
For Standard Fraction: x =
FOR THE KEY DIMENSION:From table AT 19: Page 594 Shaft Diameter:
Tolerance on b, (in): - 0.0025in
FOR THE SIZE OF THE KEY: (L)For Shear: =
For Compression: =
Therefore; Use L.s = 2.74in. with 1/2 x 3/8 cross sectional area
FOR THE LENGTH OF THE HUB: From Chapter 10, page 283, typical hub length falls between 1.25 to 2.4 shaft diameter.
TOLERANCES AND ALLOWANCESFor the yoke at Section A and B, use loose running fit (Rc-9)Page 83: Tolerances and Allowances:FOR THE HOLE:+ Hole Tolerance
Nominal Size - 0.000
FOR THE SHAFT:+ 0.000
Nominal Size Allowance - Shaft Tolerance
At Yoke A:
From Table 3.1: RUNNING AND SLIDING FITS:NOMINAL SIZE RANGE(in)RC 9: (x10-3)
HoleShaft
0.20 0.40+3.5-5.0
0-7.2
Hole Tolerance = 0.0035 - 0.0000 = 0.0035 in.Shaft Tolerance = - 0.005 - (- 0.0072) = 0.0022in.Allowance = 0.000 - (- 0.005) = 0.005 in.
FOR THE HOLE:+ 0.0035 Tolerance
0.25 in- 0.000
+ 0.000
FOR THE SHAFT:
- 0.0022 Tolerance
At Yoke B:
From Table 3.1: RUNNING AND SLIDING FITS:NOMINAL SIZE RANGE(in)RC 9: (x10-3)
HoleShaft
0.40 0.71+4.0-6.0
0-8.8
Hole Tolerance = 0.004 - 0.000 = 0.004 in.Shaft Tolerance = - 0.006 - (- 0.0088) = 0.0028in.Allowance = 0.000 - (- 0.006) = 0.006 in.FOR THE HOLE:- 0.000
+ 0.004 Tolerance
0.438 in
FOR THE SHAFT:+ 0.000
- 0.0028 Tolerance
At Yoke C:
From Table 3.1: RUNNING AND SLIDING FITS:NOMINAL SIZE RANGE(in)RC 9: (x10-3)
HoleShaft
1.19 1.97+6.0-8.0
0-12.0
Hole Tolerance = 0.006 - 0.000 = 0.006 in.Shaft Tolerance = - 0.008 - (- 0.012) = 0.004in.Allowance = 0.000 - (- 0.008) = 0.008 in.
FOR THE HOLE:- 0.000
+ 0.006 Tolerance
1.812 in
FOR THE SHAFT:+ 0.000
- 0.004 Tolerance
SUMMARY OF COMPUTED AND ADJUSTED VALUES
PartsComputed values( inches )Computed values(inches)
L12020
D10.25
d10.25
a10.125
b10.0625
m10.5
t10.125
e10.25
L255
D20.4375
d20.4375
a20.3125
b20.15625
m20.8125
t20.3125
e20.4375
Ds1.8125
Dh3.25
b0.5
t0.375
Ls2.742.74
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