RE: False sense of security, thread locker

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi Jon, DC, all,

Yes, I notice tungsten shrinks quite a bit when it's frozen. Even still they
were hard to get in as my machinist did do a close tolerance ream fit to the
brass alltread. These are 1/8" electrodes destined for DC low power testing
and the brass is nearly threaded on the G10.

The point was twofold, is this a well known issue? Some may trust loctite
under other circumstances. Secondly, does anyone know if there a suggested
thread locker that is designed to maintain adherence under very high
temperature conditions? I haven't found any short of brazing :-)

Thanks for the suggestions. I want to be very clear on this when I build the
18" using 2.2" 1/2" tungsten; my rotor is 5/8" G10.

Best Regards,
Jim Mora


-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Sunday, April 09, 2006 2:45 PM
To: tesla@xxxxxxxxxx
Subject: Re: False sense of security, thread locker

Original poster: "Jon Danniken" <danniken@xxxxxxxxxxx>

 > Original poster: "D.C. Cox":
 >
 > For rotary sparkgaps press the 1/2 dia. x 1.5 inch long brass rod
 > axially thru the G-10 by having a machine shop do it.  They use a
 > precision reamer than reams .0005" undersize and then the press fit
 > using an arbor press is very tight.

How about putting the electrodes in the freezer (or on dry ice) to contract
them up enough so that they fit into the holes while they are cold?

Jon