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STATIC HOCKEY BLADE TESTING JIG
GROUP 20
Blake Loiselle
Mohsin Naseer
Mostafa Momtaz
Mohammad Siddiqui
Presentation OutlineOverview▪ Hockey blade testing▪ Bauer Testing Jig
Problem Statement▪ Client requirements▪ Constraints▪ Goals and Objectives
Design Process▪ Concept Generation ▪ Concept Evaluation▪ Final concept
Design Embodiment and Analysis▪ Heel Clamp▪ Toe Clamp▪ Disk▪ Jig Assembly
Closing Thoughts▪ Current Progress▪ Challenges▪ Lessons Learned
The stick at a glance…
Blade patterns have evolved!
● professional players improve their skills over time
● demand variations of already present blades to better suit their needs.
● One problem hockey stick developers have yet to solve is standardizing the torsional rigidity of the various hockey stick blades available in the market
Courtesy Bauer Inc.
essential step during manufacturing of hockey sticks…
Hockey blade testing
What is Torsional Rigidity?The ratio of the torque applied about the centroid axis of the body to the resulting torsional angle, when the other end is held fixed. ● Mathematically expressed as
T is applied torque or torsion in N.m. G is the shear modulus in GPa L is the length of the object in m ∅ is the angle of twist in radians
Bauer Hockey Blade Testing Jig
Torque applying
disk
Blade toe Clamp
Blade heel clamp
Dynamometer pull (bike
chain)
Adjustable Platform
© Bauer Hockey
Shortcomings● Blade toe not flat – clamping plates deform toe’s curvature ● Deformation and friction in the bike chain
Problem Statement
“Conceptualize and redesign a heel and toe clamping device, better known as the testing jig in order to produce more
reliable results in repeated torsional tests on a variety of hockey blades”
Client Requirements From pairwise comparison chart (PCC) and function means tree (FMT)
Constraints● Cost cannot exceed $5000● Blade will not twist more than 15° in either direction● Curve depth does not exceed ¾” for legal hockey blades● Maximum blade length 12.5”● Blade width between 2-3”● Disk diameter 12” and force from dynamometer 113 lbf● The redesigned jig must be restricted to the table
dimensions● Torque and angle measurement using the existing
dynamometer
How?● Brainstorming● Literature review● Eliminate unfeasible ideas ● Concept Generation and Evaluation● House of Quality (HOQ)● Morphological Chart ● Pugh’s matrix ● Design Embodiment● Material consideration● CAD modeling and detailed drawings
Our goal?• Analyze the aspects of Bauer’s design that contributed to their inconsistency• Mitigate the sources of error, and• Build a final design that improves stability, consistency and standardization
JIG DESIGN
Torsional Rigidity
minimize human error
Accommodate any blade
pattern
minimize surface damage cost
effective durable for many tests
accommodate different blade
lengths
isolate the blade from
stickprecise for repeated
measurements
Angle of disk rotation <15°
supports weight of the blade
at heel and toe
Brainstorming
Concept 1
● 4 line loads for clamping at heel
● 3D printed adapters for the toe clamp
● Translation along y-axis via track to
accommodate for blades of varying
length
● Rotating heel mounting structure
Concept 2● line loads at the heel and toe (for clamping)● screw lock mechanism at the heel to fix column rotation● pegs for adjusting the x and y position of the base
Concept 3
● applied twist using 4 bar-linkage system instead of a disk
● line load clamps to secure the shaft
● toe clamped to a disk, which in turn is attached to the bar
● lacks versatility
Concept 4
● point contact spherical clamps at the toe and heel
● rotating platform for adjustability at the heel
● point contact clamping not ideal for rotation
Concept Evaluation Morphological Chart
Pugh’s Matrix
Concept 1 leads!
Concept 1 leads!
● Uses 3D printed adapters ● hold any specific blade pattern rigidly ● no deformation prior to testing● max. torque transmission to blade ● Reduced potential for surface damage
● Line loading at heel● good contact (no drastic curve)● strong forces to prevent torque
● Translational base and heel structure● offers highest versatility● simple and sturdy design
Final Concept
Jig Design
Platform
Disk Support
Disk
Toe Clamp
Blade
Heel Clamp
Y-direction shaft
X-direction shaft
Jig Design
28”
17.9”
18.48”
Heel Clamp: DesignY-Direction: 5.32” Variation
X-Direction: 7.03 “
Heel Clamp: Design
Rollers: 1.04” Variation
Heel Clamp Structure
Rotating Disk: 32.3 Variation⁰
Heel Clamp: Analysis
●
Mz
My
Mz
● 2-plane bending
● Fixed-fixed indeterminate beam
● Safety factor = 2
● D= 0.759 ‘’
● For further safety, D=1.0 ‘’
My
Heel Clamp: MaterialStructure - Aluminum 6013
● Strong enough: Yield Tensile Strength = 160 MPa● 3 times lighter than low carbon steel● Good machinability● Market Availability (McMaster Carr), given dimensions● Not expensive - $142.95
Heel Clamp: MaterialSlider Shafts - Aluminum 6061 (Anodized)
● Strong enough: Yield Tensile Strength = 241 MPa● Corresponding locks and supports are available in desired
dimensions ● Cheap: $34.1
Shaft LockShaft Support
Toe Clamp: Design
● 3.17’’ variation horizontally
● 4 pins holding adapter
● 4 holes mounting bracket to disk
● bearing between adjustment rods and adapter holders
4.33”
10.24”
2.36”
3.15”
2.76”
Toe Clamp: Dimensions
Structure - Aluminum 6013
● Strong enough: Yield Tensile Strength = 160 MPa● 3 times lighter than low carbon steel● Good machinability● Market Availability (McMaster Carr), given dimensions● Not expensive - $131.96
Toe Clamp: Material
Toe Clamp: AdapterAdapters - Carbon Fiber
● Strongest material available at McGill 3D Printing Service - 700 MPa● Affordable - $2.6/cm3
Adapter Boundary
Disk: Design
● Material: Aluminum 6013
1”
12”
R=6”
Testing Jig Assembly
Testing Jig Assembly
Current Progress● Heel Clamp Structure Redesign More parts for
machinability/assembly
Multiple, easy access bolts to adjust angle of rotation
Overall design change to accommodate new parts
Simple rod beam supports
Current Progress● Given a “go-ahead” to machine parts by machinists, however due to
an excess of orders and our own later submission production is estimated to be end of April for completion
Current ProgressNext Steps
1. Finish modelling Disk Support Structure
2. Update all part drawings and submit work order form
3. Address the cut direction issue with the 3D printed adapters, make mirrored part and submit for fabrication (postponed due to machinist priority)
4. Order off the shelf components (all currently available on McMaster-Carr, < 1 week delivery)
Challenges● Using different methods to simplify problem - use of safety factors● Obtaining all details - lack of information negatively affects design
process● Communicating well - between team and company● Having a balance of skills - missing some key strengths that could be
applied to our design
Learning LessonsThe importance of problem clarity
● What are all the components that make up a hockey stick blade jig?● Prototype environment? Dimensioning?● Are we constrained to a torque application procedure (Dynamometer
vs. piston with 4 bar linkage force application)
“Don’t need to reinvent the wheel”● Can use inspirations in other designs for our own implementation if
those concepts do not negatively affect our design goals and functions
● Project can be classified as a continuous improvement project due to its nature
Thank you!Questions?