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Re: [OMG] Bridge Competition Rules


s. Apr 4, 2012 6:55 PM
Posted in group: Omaha Maker Group
me as well.

On Wed, Apr 4, 2012 at 7:32 PM, Eric J. Kaplan <ekap...@gmail.com> wrote:
> Count me in.
>
> Sent from Eric's iPhone
>
> On Apr 4, 2012, at 7:10 PM, Kevin Fusselman <ke...@fusselman.org> wrote:
>
> I did some price research on balsa, and it looks like Hobby Lobby carries it
> fairly reasonably, though it still costs over twice what you can order it
> for (before shipping)...
>
> If anyone is interested in splitting shipping, let me know by Monday, as
> I'll be ordering the first part of next week.
>
> On Wed, Apr 4, 2012 at 4:33 PM, Luke <luk...@gmail.com> wrote:
>>
>> Thinking about it
>>
>> Luke
>>
>> On Apr 4, 2012, at 3:54 PM, Kevin Fusselman <ke...@fusselman.org> wrote:
>>
>> Are you volunteering? :)
>>
>> On Wed, Apr 4, 2012 at 2:52 PM, Luke Dub <luk...@gmail.com> wrote:
>>>
>>> i'm thinking a linear increasing load source with a load-cell that holds
>>> the max load value on a digital readout would be cool.
>>>
>>>
>>>
>>> On Wed, Apr 4, 2012 at 12:03 PM, Eric Kaplan <ekap...@gmail.com> wrote:
>>>>
>>>> Just for grins, here are some resources:
>>>>
>>>> http://www.enasco.com/c/artsandcrafts/Woodcrafts/Balsa+Wood/
>>>> http://www.dickblick.com/products/midwest-products-genuine-balsa-wood/
>>>> http://www.nationalbalsa.com/BalsaWood_s/22.htm
>>>>
>>>> http://www.midwestproducts.com/store/products/37e8ca9f-0efe-472b-9a70-7d2268faf200/1/Balsa.aspx
>>>>
>>>> Blick also offers a kit of supplies for (24) bridges for classroom
>>>> education.  Although this level does not include material for the road
>>>> decking of the bridge, it might be a good value if several folks wanted to
>>>> split the package - $70
>>>>
>>>> http://www.dickblick.com/products/midwest-products-bridge-building-class-packs/
>>>>
>>>> On Wed, Apr 4, 2012 at 11:26 AM, David Knaack <david...@gmail.com>
>>>> wrote:
>>>>>
>>>>> Below are the rules for the Bridge Competition.
>>>>>
>>>>> Please ask if you would like clarification of the intent of the rules.
>>>>>
>>>>> The general idea is that it needs to function as a bridge for a toy
>>>>> car, allowing the toy to cleanly traverse the entire length of the bridge,
>>>>> with a realistic maximum allowable grade.
>>>>>
>>>>> If you plan to use a really exotic construction method, plan on
>>>>> providing detailed documentation or demonstrating the method.
>>>>>
>>>>> ----
>>>>>
>>>>> Bridge:
>>>>>
>>>>> May contain only balsa wood and Titebond 2 wood glue.
>>>>>
>>>>> Must fit within a 50 x 20 x 10 cm rectangular volume.
>>>>>
>>>>> May not contain more than 6oz of glue by wet volume.
>>>>>
>>>>> Must have a smoothish road deck no less than 6cm in width.
>>>>>  - suitable for a HotWheels-style car to easily roll over
>>>>>
>>>>> Deck ends must contact the upper surface of the test rig support
>>>>> planks.
>>>>>
>>>>> Deck must have no more than a 10% grade (where grade = 100 *
>>>>> (rise/run))
>>>>>
>>>>> Deck must accommodate the load plate.
>>>>>
>>>>> Some part of the load plate must fall across the midpoint of the span.
>>>>>
>>>>> There are no limits on construction tools or technique.
>>>>>
>>>>>
>>>>>
>>>>> Scoring:
>>>>>
>>>>> The load plate is 10 x 5 x 1 cm, and has a loading hook extending from
>>>>> the center of the bottom surface which requires 1 cm annular clearance
>>>>> through and below the bridge deck.
>>>>>
>>>>> Bridges will be loaded progressively (w/ minimum shock load), starting
>>>>> at 5kg and progressing in 1Kg increments to 10Kg.
>>>>>
>>>>> Upon reaching the maximum load, the bridge must hold for 1 minute.
>>>>>  - Disputes as to whether a bridge 'held' will be resolved by vote
>>>>>
>>>>> Bridges that fail will be ranked by the weight carried without failure
>>>>> and bridge mass.
>>>>>
>>>>> Bridges that do not fail will be ranked by the mass of the bridge.
>>>>>
>>>>>
>>>>>
>>>>> Testing:
>>>>>
>>>>> The open span between the support planks is 30cm.
>>>>>
>>>>> The open span is between rectangular, fixed, smooth, level, coplanar
>>>>> planks with a thickness of ~2cm.
>>>>>
>>>>> The bridge may touch the top or inner surfaces of the supporting
>>>>> planks, but may not touch any other surface, nor be affixed to any surface.
>>>>>
>>>>> The load plate will support a wire or rod from which the test load will
>>>>> be suspended.
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>>
>>>> Eric J. Kaplan
>>>>
>>>> ekap...@gmail.com
>>>> www.ejk00.smugmug.com
>>>>
>>>>
>>>
>>
>