Re: general question X

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "brian by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ka1bbg1-at-mcttelecom-dot-com>

Hi, well tungsten carbide can be ground with a "green wheel" type #37 some
are black but most are green in color. it wears down quickly but will cut
tungsten carbide nicely. Diamonds are still a machinists best friend....cul
brian
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, June 16, 2001 4:41 PM
Subject: Re: general question X


> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
>
> Hi,
>
> I have cut and filed pure tungsten.  Although, it is very hard and will
> quickly dull a file or saw (hack saw with the expensive blades), it can be
> done.  That is how I used to cut and size 1/8th inch tungsten rods for may
> older rotary gaps.  A file can also make a notch and then you can snap the
> rod to break it (safety glasses!).  I doubt you could make threads in
> tungsten with a tap.  Probably and ECM machine but...  Sears sells
titanium
> drill bits that are for armor plate and such but drilling a hole in
> tungsten would be an "adventure".  Pure tungsten 1/8 inch welding rods can
> be found at any welding shop and they can order larger sizes if you have
> enough money.  Some tungsten welding rod is slightly radioactive which I
> avoid especially if you are going to be grinding it.  The pure kind is
> common now so best to avoid the thorium kind IMHO.
>
> I think tungsten carbide which is SUPER hard gets confused with the much
> softer (but still very hard) pure tungsten.  I think only liquid cooled
> diamond tools can touch it at the hobby level.  Marc has reported great
> results with tungsten carbide in spark gaps and it is much more available
> than big chunks of pure tungsten since it is commonly used for machine
tool
> cutters.
>
> Cheers,
>
> Terry
>
> At 10:07 PM 6/15/2001 -0400, you wrote:
> >Tesla list wrote:
> >
> >> Original poster: "Wade B AndB Anderson by way of Terry Fritz
> >><twftesla-at-qwest-dot-net>" <nabedaw-at-juno-dot-com>
> >
> >> hi guys,
> >
> >> What type of material is tungsten? Hard or soft? is it drillable to
tap?
> >> or thread?
> >
> > Some years back, i did some EMI studies on RF stabilized arc
> > welders.  The RF source is a spark gap.  Maintenance instructions,
> > from the manual, included:
> >
> > Do Not Attempt to file the gap: the points are
> > tungsten, which is harder than the file.
> >
> > best
> > dwp
> >
>
>
>