Hi Kay,

I agree on the use of a razor blade around "eager hands".
I'm just wondering if this method (razer blades) is the best, in terms of
less friction and longer duration oscillation's when the boom is free
running.

Chris's new boom to mast attachment looks very efficient.
Considering all the changes you and Chris made, what kind of improvement's
have you noted over the stock AS-1?

Richard
IRIS KCMA



On Sun, Jan 23, 2011 at 2:01 PM, Kay Wyatt  wrote:

>  Hi Richard,
>
> Chris Chapman has provided considerable guidance to me and suggested two
> possible alternatives to the knife edge of the AS-1.
>
> 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 -----
> *From:* Richard Schneider 
> *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,
>
> Richard
>
>
Hi Kay,
=A0
I agree on the use of a razor blade around "eager hands".
I'm just wondering if this method (razer blades)=A0is the best, in=
 terms of less friction and longer duration oscillation's when the boom=
 is free running.
=A0
Chris's new boom to mast attachment looks very efficient.
Considering all the changes you and Chris made, what kind of improveme=
nt's have you noted over the stock AS-1?
=A0
Richard
IRIS KCMA


=A0
On Sun, Jan 23, 2011 at 2:01 PM, Kay Wyatt <kwyatt@............
om> wrote:



Hi Richard,
=A0
Chris Chapman has provided considerable guidance =
to me and suggested two possible alternatives to the knife edge of the AS-1=
..=A0 
=A0
In the first example, he suggested clamping a sta=
ndard razer blade to BOTH the horizontal arm and the vertical support.=A0 T=
he razer blade flexes very nicely with little friction.=A0 Since I build se=
ismometers for schools which sometimes have eager hands around them, I chos=
e not to use a razer blade.=A0 Even though the ends can be dulled, if the a=
rm is bent too far it can snap and I was afraid of pieces flying off into e=
yes.

=A0
The second design that Chris suggested I thought =
was so clever it was close to magic.=A0 It is hard to describe, so I just u=
ploaded=A0a PDF file that has the design drawings that I made for my seismo=
meter.=A0 The pivot mechanism is shown on page two of the PDF file.=A0 You =
can see from my work that it had strong influence from Chris Chapman who I =
consider to be my good friend.=A0 Here is the link to the PDF file:<=
/div>

=A0
http://www.oregonshakes.com/temp/DesignDr=
awings4.pdf
=A0
Enjoy!
Kay Wyatt



=A0
=A0

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


Hello PSN,
=A0
I would appreciate any comments regarding my AS-1 type sensor. It'=
s close to the original design. I did not like the=A0knife edge=A0aluminum =
boom=A0attached to a score mark in the aluminum mast, so I=A0modified the b=
oom=A0to 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 runni=
ng oscillations have a much longer duration. Does anyone have a better sugg=
estion? I would like to hear from you.

=A0
See my pic's here:=A0 http://picasaweb.google.com/cfi2fly/MyPict=
ures#
=A0
Also, Chris, if you read this,=A0if I reversed the coil and magnet, wo=
uld the effort be worth the results?
=A0
Thank you all,
=A0
Richard