Hi Richard,

Chris Chapman has provided considerable guidance to me and suggested two =
possible alternatives to the knife edge of the AS-1. =20

In the first example, he suggested clamping a standard razer blade to =
BOTH the horizontal arm and the vertical support.  The razer blade =
flexes very nicely with little friction.  Since I build seismometers for =
schools which sometimes have eager hands around them, I chose not to use =
a razer blade.  Even though the ends can be dulled, if the arm is bent =
too far it can snap and I was afraid of pieces flying off into eyes.

The second design that Chris suggested I thought was so clever it was =
close to magic.  It is hard to describe, so I just uploaded a PDF file =
that has the design drawings that I made for my seismometer.  The pivot =
mechanism is shown on page two of the PDF file.  You can see from my =
work that it had strong influence from Chris Chapman who I consider to =
be my good friend.  Here is the link to the PDF file:

http://www.oregonshakes.com/temp/DesignDrawings4.pdf

Enjoy!
Kay Wyatt


  ----- Original Message -----=20
  From: Richard Schneider=20
  To: PSNLIST@.................
  Sent: Sunday, January 23, 2011 11:54 AM
  Subject: AS-1 Type Sensor


  Hello PSN,

  I would appreciate any comments regarding my AS-1 type sensor. It's =
close to the original design. I did not like the knife edge aluminum =
boom attached to a score mark in the aluminum mast, so I modified the =
boom to mast attachment. I am using two razor blades. One on the boom =
and one on the mast. Hardened steel on steel. Friction is much less. =
Free running oscillations have a much longer duration. Does anyone have =
a better suggestion? I would like to hear from you.

  See my pic's here:  http://picasaweb.google.com/cfi2fly/MyPictures#

  Also, Chris, if you read this, if I reversed the coil and magnet, =
would the effort be worth the results?

  Thank you all,








Hi Richard,
 
Chris Chapman has provided considerable guidance =
to me and=20
suggested two possible alternatives to the knife edge of the AS-1.  =


 
In the first example, he suggested clamping a =
standard=20
razer blade to BOTH the horizontal arm and the vertical support.  =
The razer=20
blade flexes very nicely with little friction.  Since I build =
seismometers=20
for schools which sometimes have eager hands around them, I chose not to =
use a=20
razer blade.  Even though the ends can be dulled, if the arm is =
bent too=20
far it can snap and I was afraid of pieces flying off into =
eyes.
 
The second design that Chris suggested I thought =
was so=20
clever it was close to magic.  It is hard to describe, so I just=20
uploaded a PDF file that has the design drawings that I made for my =

seismometer.  The pivot mechanism is shown on page two of the PDF=20
file.  You can see from my work that it had strong influence from =
Chris=20
Chapman who I consider to be my good friend.  Here is the link to =
the PDF=20
file:
 
http://www.=
oregonshakes.com/temp/DesignDrawings4.pdf
 
Enjoy!
Kay Wyatt
 
 

  
----- Original Message ----- 
  From:=20
  Richard =

  Schneider 
  
To: PSNLIST@.............. =

  
Sent: Sunday, January 23, 2011 =
11:54=20
  AM
  
Subject: AS-1 Type Sensor
  


  
Hello PSN,
  
 
  
I would appreciate any comments regarding my AS-1 type sensor. =
It's close=20
  to the original design. I did not like the knife =
edge aluminum=20
  boom attached to a score mark in the aluminum mast, so =
I modified=20
  the boom to mast attachment. I am using two razor blades. One on =
the boom=20
  and one on the mast. Hardened steel on steel. Friction is much less. =
Free=20
  running oscillations have a much longer duration. Does anyone have a =
better=20
  suggestion? I would like to hear from you.
  
 
  
See my pic's here:  http://picasaweb.=
google.com/cfi2fly/MyPictures#
  
 
  
Also, Chris, if you read this, if I reversed the coil and =
magnet,=20
  would the effort be worth the results?
  
 
  
Thank you all,
  
 
  
Richard