Thanks Meredith.  Can't wait to get the metal for the seismometer.  Will =
let you know how it turns out.  BTW, no need to eat crow.  You, Chris =
and Dick have been invaluable to be.
James Allen
  ----- Original Message -----=20
  From: meredith lamb=20
  To: psn-l@.................
  Sent: Monday, August 25, 2008 6:38 PM
  Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER


  James,

  Its time for me to eat some crow...and happily learn more.   Chris =
Chapman forwarded me a email on this subject and informs "us" that the =
door strip is ordinary bronze (not phosphor bronze) and about 0.006" =
thick.

  Chris Chapman quotes:

  "As long as the strip can bear the load without exceeding its elastic =
limit, that will be fine.  A 1/4" strip, 13 thou thick at 10 lbs is =
about 3,000 psi.  Even cast material will give you >25,000 psi yield =
strength.  Any difference in the springyness will be taken up when the
  horizontal balance is set.  We have used SS safety razor blades as =
spring suspensions in verticals quite OK."

  "However, I note that McMaster do supply the 510 alloy in small sheets =
for about $20.  This is the very high strength springy phosphor bronze =
98,000 to 154,000 psi yield, but it is difficult to machine.  You could =
probably coat it with candle wax, use a scriber to make lines and then =
etch the shape with acid. Maybe vinegar? I haven't tried it, but it will =
likely work.  Metal acetates are mostly soluable.  Alternatively, you =
electolytically etch the line?"

  "KS metals also supply 10 and 18 thou thick 430 SS 1/2" strip.  KS =
metals supply 8 thou PB sheet."

  The sentences in bold letters abover are the real clinchers.  I'll =
forward the 0.014" thick phosphor bronze by mail.  It can be easily be
  cut up with hand shears and rough edges deburred with a file.


  Take care, Meredith


  On Sun, Aug 24, 2008 at 10:59 PM, JAMES ALLEN  =
wrote:

    Thanks Meredith, I will check.  Perhaps some old fashioned hardware =
stores or scrap metal dealers.  If I find some I will make it available =
to all who wants some.  Again, thanks for all your help and advice.
    James Allen







Thanks Meredith.  Can't wait to =
get the metal=20
for the seismometer.  Will let you know how it turns out.  =
BTW, no=20
need to eat crow.  You, Chris and Dick have been invaluable to=20
be.
James Allen

  
----- Original Message ----- 
  From:=20
  meredith lamb 
  
To: psn-l@.............. 
  
Sent: Monday, August 25, 2008 =
6:38=20
  PM
  
Subject: Re: SPRENGNETHER 201 =
LONG PERIOD=20
  VERTICAL SEISMOMETER
  


  

  
James,
  
 
  
Its time for me to eat some crow...and happily learn more.   =
Chris=20
  Chapman forwarded me a email on this subject and informs "us" =
that the=20
  door strip is ordinary bronze (not phosphor bronze) and about 0.006"=20
  thick.
  
 
  
Chris Chapman quotes:
  
 
  
"As long as the strip can bear the load without exceeding its =
elastic=20
  limit, that will be fine.  A 1/4" strip, 13 thou thick =
at 10 lbs=20
  is about 3,000 psi.  Even cast material will give you >25,000 =
psi=20
  yield strength.  Any difference in the springyness will be =
taken up=20
  when the
horizontal balance is set.  We have used SS =
safety razor=20
  blades as spring suspensions in verticals quite OK."
  
 
  
"However, I note that McMaster do supply the 510 alloy in small =
sheets=20
  for about $20.  This is the very high strength springy phosphor =
bronze=20
  98,000 to 154,000 psi yield, but it is difficult to machine.  You =
could=20
  probably coat it with candle wax, use a scriber to make lines and then =
etch=20
  the shape with acid. Maybe vinegar? I haven't tried it, but it will =
likely=20
  work.  Metal acetates are mostly soluable.  Alternatively, =
you=20
  electolytically etch the line?"
  
 
  
"KS metals also supply 10 and 18 thou thick 430 SS 1/2" =
strip.  KS=20
  metals supply 8 thou PB sheet."
  
 
  
The sentences in bold letters abover are the real =
clinchers.  I'll=20
  forward the 0.014" thick phosphor bronze by mail.  It can be =
easily=20
  be
cut up with hand shears and rough edges deburred with a =
file.

  
 
  
Take care, Meredith


  
On Sun, Aug 24, 2008 at 10:59 PM, JAMES ALLEN =
<jcallen1@...........> wrote:

  

    

    
Thanks Meredith, I will =
check.  Perhaps=20
    some old fashioned hardware stores or scrap metal dealers.  If =
I find=20
    some I will make it available to all who wants some.  Again, =
thanks for=20
    all your help and advice.
    
James Allen

    

      =