Re: Carbide Inserts for Rotary Electrodes

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: DRIEBEN@xxxxxxxxxxxxxxx 

Terry, Jon,

MaMaster-Carr does indeed carry the tungsten carbide
drill blanks in various diameters and lengths and I
was able to get the exact diamteters and lengths that
I neede for my RSG without having to do any cutting of
the extremely hard tungsten carbide. Conduction is good
in my case.

David Rieben

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Friday, September 30, 2005 4:54 pm
Subject: Re: Carbide Inserts for Rotary Electrodes

> Original poster: Terry Fritz <vardin@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Hi Jon,
>
> Look into the inserts they use for heavy rock oil drilling drill
> bits.  If you look around you can buy them separately.  I have a
> few
> somewhere and they look really nice!  About 1/2 inch diameter by
> say
> 3/4 inch long with a rounded tip.
>
> I have long lost all the links, but look for oil drilling drill
> bit stuff...
>
> http://www.tandtcarbide.com/
>
> Mcmaster.com might sell blank carbide rods too.
>
> I think some carbides are fairly non-conductive and others are
> very
> conductive??  I am not sure...
>
> Cheers,
>
>         Terry
>
>
> At 03:04 PM 9/30/2005, you wrote:
> >Thanks, D.C. What I'm looking for is something more readily
> available than a
> >custom manufactured item. There was a post a few years ago
> regarding the use
> >of carbide 'bullets' used in road grading or boring machines
> IIRC, and I was
> >hoping someone had information regarding the types of these that were
> >working for them.
> >
> >Barring readily available screw-in inserts, I am considering
> brazing my own
> >to brass stock. Any information on these, as well as the brazing
> process>itself and carbide in general, would be appreciated.
> >
> >I do realize that you have a business with this sort of thing
> (which is a
> >great resource), and that you might consider information of this
> type to be
> >proprietary.
> >
> >I'm looking at this as a hobbyist on a shoestring (more like a
> dental floss)
> >budget who is hoping other hobbyists have approached this issue
> before and
> >would be willing to share their experiences and methods with another
> >hobbyist. Because the labor you provide isn't free, as much of
> the work I
> >can do myself means more raw materials I am able to purchase to
> further my
> >hobby.
> >
> >I'm not in this for profit, just for sparks, and for the
> enjoyment of
> >manufacturing my own components as much as possible, including
> learning new
> >techniques and methods of fabrication to further my own abilities.
> >
> >Thanks,
> >
> >Jon
> >
> >
> >
> > > Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
> > >
> > >
> > >
> > > Resonance Research Corp stocks them in tungsten-moly alloy,
> 3/8-16
> > > screw in thread designed to screwinto a tapped 1/2 inch dia
> brass rod
> > > x 1.5 inches long.  Contact me off-list.
> > >
> > > We also stock 1 inch dia. electrodes for the stationary
> electrodes,> > tapped 1/2-13 NC.
> > >
> > > Dr. Resonance
> > >
> > >
> > > >I am building a larger rotary than my last one, and am
> realizing (as
> >others
> > > >have) that there should be a better solution than carbide
> drill blanks
> >for
> > > >the stationary electrodes.
> > > >
> > > >I am looking for some type of carbide insert, either with a
> threaded stud
> > > >attached (best, so I could just screw it in), or of a type
> that I could
> > > >braze on to a brass rod.  I am looking at 1/2" inch diameter
> or larger.
> > > >
> > > >Part of the problem is that there is an entire nomenclature
> used for used
> > > >for industrial carbide that I am unfamiliar with. Because I
> do understand
> > > >that for good reasons sources are sometimes not readily
> shared, even
> >knowing
> > > >what brand or type of insert to look for would give me a
> place to start
> >with
> > > >sourcing vendors on my own.
> > > >
> > > >So, any suggestions as to vendors or at least
> types/brands/configurations>to
> > > >look for would be most helpful.
> > > >
> > > >Thanks for any suggestions,
> > > >
> > > >Jon
>
>
>