On Fri, 10 Oct 2003, Tom Uban wrote:
> At 10:16 AM 10/10/2003 +0100, Alex White wrote:
>
> >On Wednesday 08 Oct 2003 6:10 pm, Tom Uban wrote:
> > > I also have a Fujitsu M2284K drive which has the tinted
> > > plastic HDA cover, so that you can see the guts of the
> > > 14" drive assembly.
> > >
> > > http://www.ubanproductions.com/m2284k.html
> > >
> > > --tom
> > >
> >
> >Sweet, could you give me an insight into how the shock indicator works?
> >
> >alex/melt
>
> There are both tilt and shock style indicators. They are pretty simple
> devices. I believe that the tilt ones just have a sticky surface and
> some red particles which if tilted get stuck to the sticky surface in
> order to indicate the tilted condition. The shock sensors are similar,
> but must have some sort of membrane which ruptures, allowing the particles
> to flow onto the sticky surface, or something.
>
> --tom
>
There was/is another variety that used a hard ball that was held
in place on an indent by a spring. The spring was chosen such
that an impact up to so many G's would retain the ball in position
under a blow in a lateral (to the spring/ball axis) direction.
The units could be used for either vertical or lateral shock
sensing making allowance for the weight of the ball when used to
sense vertical shock.
Very crudely -------------\
W - indent
o - ball
-
/ - spring
/
/
- don
Received on Fri Oct 10 2003 - 17:21:58 BST