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Value Comparison of Combination Wrenches. MECH 309 WSU Vancouver Department of Mechanical Engineering. Team B Jay Lui Todd May Cameron Muller Tony Nguyen Mason O’Lennick Alex Paradis Daniel Peterson Patrick Phillips Trevor Pope Jonathan Shaffer. Testing Procedures. - PowerPoint PPT Presentation
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Value Comparison of Combination Wrenches
MECH 309 WSU Vancouver
Department of Mechanical Engineering
Team B
Jay LuiTodd May
Cameron MullerTony Nguyen
Mason O’LennickAlex Paradis
Daniel PetersonPatrick Phillips
Trevor PopeJonathan Shaffer
Testing Procedures
Criteria for Comparison:
•Cost
•Microstructure Observations
•Oxidization
•Hardness
•Tolerance
•Bending/Failure
Cost
Combination Wrench Manufacturers Tested:
Manufacturer Price
Pittsburgh $1.25
Master Mechanic $6.00
Husky Pro $8.00
Craftsman $10.00
Snap-on $25.25
Microstructure
Pittsburgh:
Master Mechanic:
Husky Pro:
Craftsman:
Snap-on:
Microstructure
Pittsburgh: Master Mechanic:
Husky Pro: Craftsman: Snap-on:
Pre-Oxidation
Post-Oxidation
Hardness
0.00 10.00 20.00 30.00 40.00 50.00 60.00
43.90
45.08
46.62
48.00
43.52
44.80
41.66
41.96
52.60
53.12
Mean Hardness By Wrench Manufacturer & Treatment
Snap-on, Sample 2
Snap-on
Craftsman, Sample 2
Craftsman
Husky Pro, Sample 2
Husky Pro
Master Mechanic, Sample 2
Master Mechanic
Pittsburgh, Sample 2
Pittsburgh
Hardness (HRC)
Open-End Testing
Torque Applied via Torque Wrench Along Wrench to Maintain Line of Action
Each Wrench Head Plastically Deformed Around Test Bolt Preventing Fracture
The Amount of Play in the Open-End of Each Wrench Correlated to Slippage
Open-End Tolerance
0.00% 5.00% 10.00% 15.00% 20.00% 25.00% 30.00% 35.00% 40.00% 45.00% 50.00%
43.62%
19.92%
11.01%
0.00%
0.00%
Play on Test Bolt By Manufacturer
Snap-on
Craftsman
Husky Pro
Master Mechanic
Pittsburgh
Percentage Difference in Open-End Play
Open-End Failure Results
0.0 10.0 20.0 30.0 40.0 50.0 60.0
40.0
40.4
56.1
56.1
49.1
Open-End Wrench Failure
Snap-on
Craftsman
Husky Pro
Master Mechanic
Pittsburgh
Applied Moment (ft-lb)
t
Handle Failure Results
Pittsburgh
Snap-on
Craftsman
Master Mechanic
Husky
Handle Failure Results
0.0 20.0 40.0 60.0 80.0 100.0 120.0 140.0 160.0 180.0 200.0
140.8
162.5
181.8
147.8
171.1
Closed-End Wrench Failure
Snap-on
Craftsman
Husky Pro
Master Mechanic
Pittsburgh
Moment Applied to Handle Resulting in Failure (ft-lb)
Handle Failure Results
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0
28.2
28.7
24.8
23.3
30.2
Mass Value – Ratio of Torque per Mass
Snap-on
Craftsman
Husky Pro
Master Mechanic
Pittsburgh
ft-lb per gram
Conclusions
•Husky• Best value, good toughness and low-cost• Warranty may not be as good as high-cost wrenches
•Snap-on • Performed well but the high cost makes it a lower value• Has excellent warranty and highest failure points
•Craftsman• Best choice if failure is a concern• Good value and lifetime warranty
•Master Mechanic • Performed adequately• But for $2 more, the best value wrench, Husky, could be purchased instead
•Pittsburgh• Low-cost was evident with its low failure points and inconsistency
Questions
?