how do i build a model bridge?

Question

ok i have a project due next wednesday, may 30, n part of it is to make a model of a bridge. i have 25 pieces of balsa wood, 2' x 1/8" x 1/8", and i have to make it showing the use of an arch. i was thinking about making a bridge like this, but before just diving in n messing things up i wanted to see if u guys have any tips or instructions.. ANY help at all would be appreciated, thanks =]

the link is actually this -

http://www.niagarafrontier.com/image/BGupperarch1905.jpg

thats happens when i try to make a link with html.. lol..

Answer 1

A nice BRIDGE !! My suggestion is to get an elevation-drawing of the bridge drawn to the scale you plan to build it, then place the drawing on a piece foam-core poster board and then cover it with waxed paper.

This will allow you to build the SIDE frames of the bridge (twice) to the exact alignment and size. You can use pins to help align the pieces of balsa in the arches and hold them together while the glue for the angled spacers dries.

With the two sides built, you can then take precut spacers to hold them the correct distance apart. The road-bed can probably be built using cardstock or very light cardboard.

Good luck !!

Answer 2

You can steam four of the pieces and bend the wood to the curves needed then cut the cross pieces and glue them.
Very good ideas have been given above but I suggest instead of wax paper, you could lay your project out on a clear report cover with the photo of the bridge inside as a gluing guide. Prepare two so you can work on one while the other dries.

Also, does it have to be wood? You could pipe it with royal icing if it isn't too humid where you are and make and edible bridge!!!!!!!!!!!!!

Answer 3

Though the link doesn't work, I've made a bridge before so here are my tips:

notch the end of the woods SLIGHTLY when you glue ends together for a stronger hold.

use a small, not overly larger razor blade.

too much glue is not necessarily a good thing.

triangles are the strongest shape.

good luck, as you only have four days! (it took my group of four about a month and a half...)