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29.1
Forum Link Code: [gal2]1889|52/29.1.JPG[/gal2]
Description: Mass: 10.2g, Load: 27lbs, Efficiency: 1203
From bridge 28, I brought down the densities of the compression members. As the bridge loaded, I saw lots of side to side motion. Ultimately, the failure occurred directly beneath the loading block. In bridge 30, I compensated for this break by bulking up that area.
Username: Aia
Date: 14.08.2009 19:02
Hits: 1024
Downloads: 13
Rating: 0.00 (0 Vote(s))
File size: 348.5 KB
Added by: Aia

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Author: Comment:
...
Guest

What are the dimension of the loading block required?
and how can you laminate the wood?
13.02.2010 22:56  
helloperson :P
Guest

i am not very good at this but i know the the dimensions are 45mm by 45mm and there are two ways to laminate the wood i think. one way you sandwich the members like this (the i is themembers and thel's are the lamination) lil and the other you put it on top of the other piece like a t shape if you look at it from the side.
14.02.2010 14:46  
Aia_
Guest

The standard loading block for the 2009 season was used for this bridge- 5 x 5 x 2cm.

Can you clarify what you meant by the lamination question? Do you mean lamination in general, or the specific lamination on this bridge?
14.02.2010 19:39  
...
Guest

Well i was reading through the rules and i came across wood lamination, they said commercially laminated woods are not allowed but unlimited lamination by the students are okay. I'm still having a hard time understanding it.

Besides what does the lamination do to the wood? does it make it stronger?
16.02.2010 19:49  
Aia_
Guest

Basically, the rules state that you can laminate as much as you please. I've never actually come across "commercially laminated wood" for this event.

Lamination offers several benefits. Sometimes, a laminated piece composed of two light pieces of wood is lighter and stronger than one dense piece of wood. In areas of a bridge where lots of compression is occurring, proper lamination can considerably strengthen a bridge.
17.02.2010 00:30  
...
Guest

well then is there a specific technique to laminate the wood? or is it just 2 pieces of wood glued together?
18.02.2010 17:37  
Aia_
Guest

There are several types of lamination. You can simply glue two pieces of wood together as you have suggested, or you can create T or I beams. There are also other variations on lamination, but those are the most common. It mostly depends on the location of that piece, and the amount of pressure it will be undergoing.

When laminating, I typically use pins. I pin one piece down, spread just a small amount of CA on top of that piece, and then "thread" the piece I wish to laminate through the pins, and then press down. Since CA dries so quickly, I've found this method to be very useful and accurate.

I hope that answers your question. : )
21.02.2010 11:10  

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