Hi

The material that I used in v2.0.0 sensor is mostly iron and steel.
Including the nesscary ball bearing and the boom. However, my sensors
does have issues. I hope to fix them after the weekend. When that change
is over, I am going add more pictures.

I plan to use this setup for the arm, as the setup needs to be forced
balance, as it currently use it holds the arm up by tugh hindge and that
does not work properly.

 http://www.mckimzey.com/seismometer/lehman/boom_support.jpg
http://www.mckimzey.com/lehman.html

Regards.
J=F3n Fr=EDmann.

On lau, 2009-05-02 at 06:24 -0700, Robert O. Green wrote:
> Hi  Jon,
>=20
> Thank you for these pictures they help.
>=20
> Is the top pivot a set of crossed carbide steel shafts?
>=20
> Is the bottom pivot a SS ball bearing on the boom against a SS bolt head?
>=20
> I am about to begin my effort.  It seems the pivots are everything.
>=20
> Rob
>=20
> J=F3n Fr=EDmann wrote:
> > Hi
> >
> > Here are pictures of the top and lower pivots. The top is a hindge that
> > allows free movement of the arm.
> >
> > It was recomenned to me that I should put the magnet on the base, not
> > the arm. But I am not sure about the diffrance, I don't think it is
> > none. But it works anyway.
> >
> > I am still unable to get the sensor frequancy below 0.4Hz. But this
> > design is a lot more flexable then the last one I used.
> >
> > After the weekend I am going to do one more change. I plan to change th=
e
> > setting of the arm. So it has not such sharp angle, but I belive that i=
s
> > hampering my effort in getting the frequancy below 0.4Hz, as sharp angl=
e
> > means faster movement of the arm.
> >
> > http://www.jonfr.com/myndir/v/geology/lehman/p5010001.jpg.html
> > http://www.jonfr.com/myndir/v/geology/lehman/p5010002.jpg.html
> > http://www.jonfr.com/myndir/v/geology/lehman/p5010003.jpg.html
> >
> > Regards.
> > J=F3n Fr=EDmann.
> >
> >
> >
> > On fim, 2009-04-30 at 19:46 -0700, Robert O. Green wrote:
> >  =20
> >> Jon,
> >>
> >> Very nice.
> >>
> >> Can you describe the upper and lower pivots?
> >>
> >> Is there advantage to having the coil on the boom rather than the magn=
et?
> >>
> >> Rob
> >>
> >> J=F3n Fr=EDmann wrote:
> >>    =20
> >>> Hi all
> >>>
> >>> I got a new lehman seismomter build from the old one, that was not
> >>> working. The new one is bit more complex and more adjustable. Now I j=
ust
> >>> have to figure out how to get the seconds down to 10 to 20 seconds.
> >>>
> >>> Here are pictures.
> >>>
> >>> http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
> >>> http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html
> >>>
> >>> Regards.
> >>>
> >>> ---------------------------------------------------------------------=
---
> >>>
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/2009 5:25 PM
> >>>
> >>>
> >>>      =20
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