Casey,
Forget wood-not dimensionally stable
Delrin is wonderful stuff-but not for a seismo
frame Thick Aluminum is good.  If can locate
some Invar scraps, they are superb.
Steel or Iron is not  good if you are working
with a magnet/coil setup for obvious reasons.
All metals have a built-in noise effect
(Brownian motion) and it fairly easy to build
a seismo that is too sensitive, that is, one
that can detect  its' own  metallic vibrations.
This is basic problem with any object.
A simple resistor by itself generates a small but
real voltage just sitting there-depending on its'
absolute temperature.
There hobby machinists all over. Most are happy
to help a fellow traveler seeking the truth.
DL

Casey Crane wrote:

> Hi all,
>
>         I don't have access to any metal working/milling machinery
> and was wondering if any has worked with say, Baltic birch and Derlin or
> PVC stock. I'm trying to design an SG type sensor with somthing other
> than plate aluminum. Are there any caveats with these materials ?
>
> Casey
> ________________________________________________________________
> GET INTERNET ACCESS FROM JUNO!
> Juno offers FREE or PREMIUM Internet access for less!
> Join Juno today!  For your FREE software, visit:
> http://dl.www.juno.com/get/tagj.
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)