PSN-L Email List Message

Subject: RE: SPREGNETHER HORIZONAL SEISMOMETER
From: "Gary Lindgren" gel@.................
Date: Thu, 5 Apr 2012 10:58:35 -0700


James,

You received lots of answers and here is a couple more hints. I used a pin
vice to hold the small drill bits. McMaster-Carr http://www.mcmaster.com
   is a good place to get everything you need at
good prices and fast shipping. A drill press is required to drill small
holes. You can get drills that go down to .010" or smaller. The pin vice is
used to hold these small drill bits and then you mount the pin vice in the
drill vice. The drill press will probably have run-out and it will look as
if that small bit is going all over the place. But just lower the drill
slowly and aim for the center punch mark and the drill bit will straighten
right up (hopefully). Then slowly drill into the brass.

Good luck,

Gary

 

 

 

 

 

 

 

From: psnlist-request@.............. [mailto:psnlist-request@...............
On Behalf Of JAMES C ALLEN
Sent: Wednesday, April 04, 2012 9:45 PM
To: psnlist@..............
Subject: Re: SPREGNETHER HORIZONAL SEISMOMETER

 

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

 

James,

You received lots of answers and here is a couple more hints. I used = a pin vice to hold the small drill bits. McMaster-Carr http://www.mcmaster.com  = is a good place to get everything you need at good prices and fast = shipping. A drill press is required to drill small holes. You can get = drills that go down to .010" or smaller. The pin vice is used to = hold these small drill bits and then you mount the pin vice in the drill = vice. The drill press will probably have run-out and it will look as if = that small bit is going all over the place. But just lower the drill = slowly and aim for the center punch mark and the drill bit will = straighten right up (hopefully). Then slowly drill into the = brass.

Good luck,

Gary

 

 

 

 

 

 

 

From:= = psnlist-request@.............. [mailto:psnlist-request@............... = On Behalf Of JAMES C ALLEN
Sent: Wednesday, April 04, = 2012 9:45 PM
To: psnlist@..............
Subject: Re: = SPREGNETHER HORIZONAL SEISMOMETER

 

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

=  


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