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Where do I get Tungsten welding electrodes?


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From:  D.C. Cox [SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent:  Thursday, March 19, 1998 1:40 AM
To:  Tesla List
Subject:  Re: Where do I get Tungsten welding electrodes?

to: Cliff

TIG tungsten welding rod is fairly brittle.  If the RSG is even slightly
out of balance or wears unevenly dangerous mechanical resonance conditions
can occur that will cause a slight vibration in the material.  This could
lead to stress fractures and eventually a rotor explosion.  We prefer to
use the short screw-in type (1/2 inch dia) and thread them into 1 1/2 inch
long x 1/2 inch dia brass rod which is press fit into the G-10 rotor
material.  The TIG rods are ok in smaller 6 inch dia rotors but unless you
have the experience of an Ed Wingate or other machinists its not a good
idea to try to make a TIG rotor yourself -- mostly due to its brittle
nature.  Would suggest a competent machinist do the work on a turntable and
a gram scale to carefully weigh the components -- also spin balance at up
to 6000 RPM.

DR.RESONANCE-at-next-wave-dot-net


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> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-pupman-dot-com>
> Subject: Where do I get Tungsten welding electrodes?
> Date: Wednesday, March 18, 1998 8:38 PM
> 
> 
> ----------
> From:  Mark S. Rzeszotarski, Ph.D. [SMTP:msr7-at-po.cwru.edu]
> Sent:  Wednesday, March 18, 1998 4:55 AM
> To:  Tesla List
> Subject:  Re: Where do I get Tungsten welding electrodes?
> 
> Hello All:
> Cliff said in part:
> >I noticed that you mentioned that .38 in tungsten tip rods would be good
> >to use on the stationary part of a rotary gap. Is there any reason that
> >they can't be used on the rotating part of the RSG?
>         I have not built a rotary yet but have studied their design. 
They
> are EXTREMELY DANGEROUS devices, especially if you spin them up over 5000
> RPM which some folks do.  The centrifigal forces make them a lethal
weapon.
> Perhaps one of the experienced rotary folks can step in here and discuss
> design a bit.  A couple of folks on list are experienced machinists who
have
> built real masterpieces and understand the need for safety.  (Ed, Dave,
> Richard, Bill, Greg, D.C., others step forward at this time.)
> Regards,
> Mark S. Rzeszotarski, Ph.D.
>