Thanks Bob, Randy and Robert regarding ideas/ suggestions regarding =
making the Spregnether hinge.  I will explore some of the options =
suggested to try and have the brass drilled by one of the type of shops =
referenced that have the skill and equipment.
Again, thanks for your ideas
James Allen=20

From: Robert Thomasson=20
Sent: Thursday, April 05, 2012 4:43 AM
To: psnlist@.................
Subject: Re: SPREGNETHER HORIZONAL SEISMOMETER

James, not sure how you're trying to do the drilling, for holes that =
small you need a small precision drill press with an accurate chuck.  It =
would probably take more skill than I have to do it with a hand held =
drill.  My first thoughts are to try and find a real jeweler or =
silversmith or gunsmith, they may have the equipment to drill similar =
holes.  Or possibly an electronics assembly shop that does printed =
circuit board work.  It wouldn't hurt to call machine shops and ask, but =
most of them around here are more geared toward drilling 12" diameter =
holes.

Dremel sells a small drill press accessory for their variable speed Moto =
Tools that might work.  I think you'd need to use a slow speed.  You'd =
still need to devise an accurate method of holding the brass pieces =
while drilling and if it doesn't work and you don't have other uses for =
the drill press you're out $100+. =20

Bob



On Wed, Apr 4, 2012 at 9:45 PM, JAMES C ALLEN  =
wrote:

  I know that this is a long shot, but does anyone have parts for an old =
Spregnether horizontal seismometer?  Specifically the lower wire hinge.  =
The piece is a short wire with a round brass fitting at each end.  I =
tried to make it myself using piano wire and round brass stock.  But =
drilling the round brass stock to insert the wire into has been fraught =
with failure thus far since the very small drill bits I purchased at the =
hobby shop keep breaking,  Also, any advice on drilling an approximately =
..030 diameter hole in round brass stock would also be appreciated.  Do =
machine shops do this kind of work?
  James Allen





Thanks Bob, Randy and Robert regarding ideas/ suggestions regarding =
making=20
the Spregnether hinge.  I will explore some of the options =
suggested to try=20
and have the brass drilled by one of the type of shops referenced that =
have the=20
skill and equipment.
Again, thanks for your ideas
James Allen 


 

From: Robert Thomasson 
Sent: Thursday, April 05, 2012 4:43 AM
To: psnlist@.............. 
Subject: Re: SPREGNETHER HORIZONAL =
SEISMOMETER
 
James,=20
not sure how you're trying to do the drilling, for holes that small you =
need a=20
small precision drill press with an accurate chuck.  It would =
probably take=20
more skill than I have to do it with a hand held drill.  My first =
thoughts=20
are to try and find a real jeweler or silversmith or gunsmith, they may =
have the=20
equipment to drill similar holes.  Or possibly an electronics =
assembly shop=20
that does printed circuit board work.  It wouldn't hurt to call =
machine=20
shops and ask, but most of them around here are more geared toward =
drilling 12"=20
diameter holes.

Dremel sells a small drill press accessory for =
their=20
variable speed Moto Tools that might work.  I think you'd need to =
use a=20
slow speed.  You'd still need to devise an accurate method of =
holding the=20
brass pieces while drilling and if it doesn't work and you don't have =
other uses=20
for the drill press you're out $100+.  

Bob



On Wed, Apr 4, 2012 at 9:45 PM, JAMES C ALLEN =
<jcallen1@...........> =

wrote:


  

  

  

  
I know that this is a long shot, but does anyone have parts for =
an old=20
  Spregnether horizontal seismometer?  Specifically the lower wire=20
  hinge.  The piece is a short wire with a round brass fitting at =
each=20
  end.  I tried to make it myself using piano wire and round brass=20
  stock.  But drilling the round brass stock to insert the wire =
into has=20
  been fraught with failure thus far since the very small drill bits I =
purchased=20
  at the hobby shop keep breaking,  Also, any advice on drilling an =

  approximately .030 diameter hole in round brass stock would also be=20
  appreciated.  Do machine shops do this kind of work?

  
James Allen