PSN-L Email List Message

Subject: Re: Tungsten Pins
From: "meredith lamb" paleoartifact@.........
Date: Mon, 23 Jun 2008 20:29:59 -0600


Hi Gary,

Probably pictures are the easiest way to grasp such.  Its basically two
separated rods, with one
cross over rod (as the rotating pivot for the boom).  The DSCN5953 picture
has a mechanical device which
"represents a boom" attachment to the rod...but it can be done via a hole in
the pivot boom with a
setscrew, possibly a 2 setscrew shaft coupler, etc...but you need to firmly
anchor the boom to the
rod used.  See:

http://seismometer.googlepages.com/crossedrodpivot

You need to separate the two base/mast rods for stability of the pivot rod,
as much as you can; and of
course anchor them to your horizontal mast.

The web page has no text otherwise, as of yet...

BTW.....those mystery balls from the Electronic Goldmine turned out to be
brass (ugh) with a unknown
surface material thereon.  The router bit assortment which had 1/8" shanks
of carbide for the most
part seemed to have surfaces that appeared to be approaching a mirror
surface...but not quite there.
.....quite finger smooth.  Overall; their surface was much better than I
think I'd see from most regular
commercially bought ground carbide blanks/rod surfaces.  The collars on
them are a ceramic which can be
easily removed.


Take care, Meredith

On Mon, Jun 23, 2008 at 12:25 PM, Gary Lindgren 
wrote:

>  Meredith,
>
> Refresh my memory of the '3 crossed rod pivot' concept, what does this look
> like.
>
> Gary
>
>
>
>
>
>
>
>
>
Hi Gary,
 
Probably pictures are the easiest way to grasp such.  Its basically two separated rods, with one
cross over rod (as the rotating pivot for the boom).  The DSCN5953 picture has a mechanical device which
"represents a boom" attachment to the rod...but it can be done via a hole in the pivot boom with a
setscrew, possibly a 2 setscrew shaft coupler, etc...but you need to firmly anchor the boom to the
rod used.  See:
 
http://seismometer.googlepages.com/crossedrodpivot
 
You need to separate the two base/mast rods for stability of the pivot rod, as much as you can; and of
course anchor them to your horizontal mast. 
 
The web page has no text otherwise, as of yet...
 
BTW.....those mystery balls from the Electronic Goldmine turned out to be brass (ugh) with a unknown
surface material thereon.  The router bit assortment which had 1/8" shanks of carbide for the most
part seemed to have surfaces that appeared to be approaching a mirror surface...but not quite there.
....quite finger smooth.  Overall; their surface was much better than I think I'd see from most regular
commercially bought ground carbide blanks/rod surfaces.  The collars on them are a ceramic which can be
easily removed.   
 
 
Take care, Meredith 

On Mon, Jun 23, 2008 at 12:25 PM, Gary Lindgren <gel@.................> wrote:

Meredith,

Refresh my memory of the '3 crossed rod pivot' concept, what does this look like.

Gary

 

 

 

 


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