sve inc. flag mount redesign
DESCRIPTION
Group 4 Nick Hatcher, Andrew Taylor, Neil Barnes, Jakob Combs, Chris Cook. SVE Inc. Flag Mount Redesign. Agenda. Reason for the design Main requirements and targets Customer/Engineering Requirements Product presentation Performance demonstration Product evaluation - PowerPoint PPT PresentationTRANSCRIPT
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Group 4Nick Hatcher, Andrew Taylor, Neil Barnes, Jakob Combs, Chris Cook
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Reason for the designMain requirements and targets
Customer/Engineering RequirementsProduct presentation
Performance demonstrationProduct evaluation
Against the engineering targetsConclusion
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Current mount used by SVE Inc. was very prone to failure out in the field
Because of this, some of the customers have become unhappy with the current design
Competitors of SVE Inc. have designs which outperform the current SVE Inc. design
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CUSTOMERREQUIREMENTS
Mounts to ATV Minimal Cost Fits ¼” Flag Pole Can Withstand
Flexing Ease of Assembly Detachable Short Assembly
Time Pleasing Appearance Very Durable Safe for ATV Driver
ENGINEERINGSPECIFICATIONS
Bolt/Nut Assembly $7 Target Price Fits ¼” Pole Angle of
Displacement Number of Parts Number of Steps People Liking Mount Detaches From Pole Product Lifetime Angle of Recoil
WEIGHTS
12 25 20 9 5 1 5 3 10 10
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Effort was made to reduce spring recoil Keep driver and those around him/her safe
Design included ability to reuse flag pole The thumb screw and sleeve insert allows the
driver to remove the broken end of the pole and reuse the good end until it becomes undesirable because of short length. This decreases unnecessary waste produced.
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Keep costs LOW! (Under $7) Added structural support to the design
Overcoming the failure mode of the current design
Increased weld strength Previous spring design used small tack weld
Increased flexibility Current design allows only 70˚ at 14 inches
above fixed mounting point Design Lifetime
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The midterm design was initially chosen and built upon to create our final design.
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Pro-E Concept Final Design
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Pro-E Concept Final Design
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Two prototypes were created which utilized springs of different wire diameter.
Prototype AWire Diameter: 0.135”
Prototype BWire Diameter: 0.105”
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Although only two prototypes were created, it was decided to see what effect a rubber core insert would have on one of the prototypes. This was done as a means to effectively lower the recoil angle at a low cost.
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Performance Demonstration Each prototype was benchmarked
against the Polaris competition mount using the same process of measuring the angle of recoil as measured after release from an initial displacement.
A large angular measuring device was constructed and used to do multiple recoil tests on the benchmark and the prototypes.
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Apparatus used for angular measurements.
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Apparatus ready for testing with Polaris flag inserted.Each prototype was tested in this manner.
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From these results, data was compiled which evaluated each of the prototypes against the Polaris competition, some of which can be seen below.Initial Angle of
Displacement (deg)
Prototype A (w/ Rubber Core Insert) Recoil Angle
(deg)
Prototype A (w/o Rubber Core Insert) Recoil Angle (deg)
Prototype B Recoil Angle (deg)
10 5 11.75 820 14 19.75 1830 20.667 27.75 2640 31.167 36.5 35.550 40.833 42 4360 49.167 48.75 5270 52.83 56.25 59.580 58.833 62.25 67.590 64 68.75 73.5
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Having collected this data, product evaluation could begin as it was compared to data collected from the Polaris competition mount.
All engineering requirements were met except for the $7.00 cost requirement.
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This data put Prototype A w/o rubber core within 5 degrees of Polaris competition.
Polaris Spring Mount Recoil Angle(deg)
9.66617
24.33329.66638
42.66648.3355.66665
Prototype A (w/o Rubber Core Insert) Recoil Angle (deg)
11.7519.7527.7536.542
48.7556.2562.2568.75
Release Angle (deg)
102030405060708090
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This can be seen in this video…
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From our evaluation we concluded: Prototype A w/o rubber core met the most
customer requirements while saving cost. Although prototype uses the 0.135” diameter
wire with a spring rate of approx. 100 lbs./in., the final design will include spring provided by Lee Spring:▪ 0.135” wire diameter▪ 2.5” in length▪ 134.1 lbs./in. spring rate to bring recoil data closer
to Polaris
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The following recommendations give a few ideas for which cost could be saved.
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Use standard size bar stock (1”, 1.25”, etc.) Currently calling for 1.125” outer diameter
Use of less precise tolerances in design Originally called for tolerances down to
0.001”
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Pre-manufactured parts could be used McMaster-Carr and CarrLane provide off-
the-shelf parts which are similar to design and could be easily implemented.
Lee Spring would provide specific spring for these parts
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Other connection types could be used in design besides welding Press-fitting However, this would need to be tested
and possibly call for high tolerance values
Replace thumb screw with glue to cut costs
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