Need a book?
Engineering books recommendations...
Return to index:
RE: Exotic Wood Question
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: Exotic Wood Question
- From: "Lucas Jolly" <Lucas.Jolly(--nospam--at)lbdg.com>
- Date: Wed, 29 Dec 2004 15:07:10 -0800
I was in high school and had a similar project, I got beat by a kid
using this technique...
said the laminations had to be a max of 1/8". Get some 1/32" balsa wood
strips and soak the stuff in the epoxy of your choice. Clamp it together
and when it dries you will have a solid epoxy/wood block. Can't beat
kid who came up with this that ended up breaking every school record with
his bridge. I'm pretty sure he thought of him without his uncle's
I am writing on
behalf of my nephew, Jake, who is in the eighth grade. He is participating
in a science olympiad and needs to fabricate a laminated wood beam and load test
it. According to Jake, the beam must span 350 mm (13.78") and be no higher
than 40 mm (1.57") and no wider than 20 mm (0.79"). It must be a
straight, solid rectangular section fabricated from strips of wood no
thicker than 3.175 mm (0.125"), glue, and nothing else. Finally, it must
support a center load of 15 Kg (33.1#) with a deflection less than 20 mm
I am thinking that
the winning beam will be fabricated from wood that is dense and very
fine-grained, without knots or other irregularities. In other words, an
exotic hardwood from South America or Asia, like Pau Lope or Teak, rather than
good old Southern Pine or Douglas Fir. The wood must be available in
Dallas, or available online with delivery within the next two weeks. Of
course, such woods do not appear in NDS, so I have very limited information on
them. Also, I am thinking that the laminations should be vertical, rather
than horizontal. This should make a stronger beam, and make the glue
choice less important.
1] What wood species do you
recommend? What are its mechanical properties?
2] Do you concur with vertical
Thanks in advance
for your thoughts.