PSN-L Email List Message

Subject: Re: SPREGNETHER HORIZONAL SEISMOMETER
From: "JAMES C ALLEN" jcallen1@...........
Date: Thu, 05 Apr 2012 12:36:28 -0700


Thanks Gary, if I can=E2=80=99t get it done any other way I will =
purchase a drill press and use the approach you outlined.
Appreciate the very clear outlining of the approach.
James Allen





From: Gary Lindgren=20
Sent: Thursday, April 05, 2012 10:58 AM
To: psnlist@.................
Subject: RE: SPREGNETHER HORIZONAL SEISMOMETER

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

=20

=20

=20

=20

=20

=20

=20

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

=20

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

=20






Thanks Gary, if I can=E2=80=99t get it done any other way I will = purchase a drill=20 press and use the approach you outlined.
Appreciate the very clear outlining of the approach.
James Allen
 
 
 
 
 
Sent: Thursday, April 05, 2012 10:58 AM
Subject: RE: SPREGNETHER HORIZONAL = SEISMOMETER
 

James,

You=20 received lots of answers and here is a couple more hints. I used a pin = vice to=20 hold the small drill bits. McMaster-Carr http://www.mcmaster.com  = is=20 a good place to get everything you need at good prices and fast = shipping. A=20 drill press is required to drill small holes. You can get drills that go = down to=20 ..010" or smaller. The pin vice is used to hold these small drill bits = and then=20 you mount the pin vice in the drill vice. The drill press will probably = have=20 run-out and it will look as if that small bit is going all over the = place. But=20 just lower the drill slowly and aim for the center punch mark and the = drill bit=20 will straighten right up (hopefully). Then slowly drill into the=20 brass.

Good=20 luck,

Gary

 

 

 

 

 

 

 

From:=20 psnlist-request@.............. [mailto:psnlist-request@............... = On=20 Behalf Of JAMES C ALLEN
Sent: Wednesday, April 04, 2012 = 9:45=20 PM
To: psnlist@..............
Subject: Re: = SPREGNETHER=20 HORIZONAL SEISMOMETER

 

I know that = this is a=20 long shot, but does anyone have parts for an old Spregnether horizontal=20 seismometer?  Specifically the lower wire hinge.  The piece is = a short=20 wire with a round brass fitting at each end.  I tried to make it = myself=20 using piano wire and round brass stock.  But drilling the round = brass stock=20 to insert the wire into has been fraught with failure thus far since the = very=20 small drill bits I purchased at the hobby shop keep breaking,  = Also, any=20 advice on drilling an approximately .030 diameter hole in round brass = stock=20 would also be appreciated.  Do machine shops do this kind of=20 work?

James=20 Allen

 


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