Hi all,

I've put up on the web acouple photos of the simple table top/edge test
mechanism
I used to test the friction of this crossed rod hinge/suspension model,
where the
outer rim of precision ball bearing assemblys are used as the support
"rods", of
the crossed rod; that also has attached the boom/mass (pendulum) used. The
pictures focus is on the bearings or the hinge and not the pendulum mass;
which
is roughly 14" down the boom away from the Tee cross rod joint. The cross
rod on
such a hinge, would rotate on the bearing rims both toward and away from th=
e
viewers pictures direction. Its most likely someone else has used such in
the
past, but I'am not aware of it at this time. See:

http://home.earthlink.net/~meredithlamb.crbs.html

The two photos lighting wasn't the best, but the pictures convey the idea
fairly well.

This isn't a actual operating seismometer, so be aware other (non cross rod
touching)
parts would have to be added...it is only a friction test of the crossed ro=
d
and the
two ball bearing rims surfaces friction.

Take care, Meredith Lamb
Hi all,



I've put up on the web acouple photos of the simple table top/edge test mec=
hanism

I used to test the friction of this crossed rod hinge/suspension model, whe=
re the

outer rim of precision ball bearing assemblys are used as the support "=
;rods", of

the crossed rod; that also has attached the boom/mass (pendulum) used. =
; The

pictures focus is on the bearings or the hinge and not the pendulum mass; w=
hich

is roughly 14" down the boom away from the Tee cross rod joint.  =
The cross rod on

such a hinge, would rotate on the bearing rims both toward and away from th=
e
viewers pictures direction.  Its most likely someone else has use=
d such in the

past, but I'am not aware of it at this time.  See:



http://home=
..earthlink.net/~meredithlamb.crbs.html



The two photos lighting wasn't the best, but the pictures convey the idea f=
airly well.



This isn't a actual operating seismometer, so be aware other (non cross rod=
 touching)

parts would have to be added...it is only a friction test of the crossed ro=
d and the 

two ball bearing rims  surfaces friction.



Take care, Meredith Lamb