[Rockhounds] Information on Lapidary Equipment

[Kreigh Tomaszewski]

The grits are probably used with the sphere/egg cutter. Most such
machines use loose grits.

Grit sizes are formally standardized by a wire mesh (read screen). The
number of wires per inch defines the grit number. Wire sizes shrink as
the grit number increases; the holes get smaller with bigger numbers.
Practically, elutriation is usually used to sort grit sizes instead of
screens.

80 grit has particles of roughly .0075 inch. 120 is about .005 inch. 220
is about .0025 inch. 600 is about .001 inch. Aluminum Oxide pre-polish
is about .0004 inch.

Kreigh


The Hammer wrote:
> 
> Hi BJ,
> 
> To answer a small part of your questions.  If those grits are black they are most likely silicon carbide.  The grit is frequently used in tumbling  I'm sure others here on list can advise you if there are other common applications. The numbers represent the grit size (I THINK it is estimated grains per inch), so your 60 grit is the coarsest and your 600 is the finest
> 
> -Ron
> 
> ----- Original Message ----
> From: B & B <therockhunter at hotmail.com>
> To: rockhounds at lists.drizzle.com
> Sent: Saturday, February 16, 2008 7:46:48 PM
> Subject: [Rockhounds] Information on Lapidary Equipment
> 
> Hello
> Everybody
> 
> I
> am
> hoping
> that
> I
> can'
> get
> some
> help.
> I
> just
> recently
> received
> some
> lapidary
> equipment
> and
> I
> need
> anybody
> help
> with
> teaching
> material
> or
> information
> on
> the
> following
> products.
> Also
> can
> anybody
> help
> with
> the
> grits.
> I
> am
> not
> sure
> what
> each
> one
> means
> 60-100-220-400-500-600.
> Any
> little
> bit
> will
> help
> Thanks
> for
> all
> your
> help.
> 
> *
> 6
> wheel
> polish
> unit
> I
> hear
> they
> call
> it
> a
> geni
> 
> *
> Egg
> and
> sphere
> Maker
> 
> *
> Lap
> Grinding
> Wheels
> on
> a
> stand.
> 
> Thanks
> BJ
> _________________________________________________________________
> 
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
>   text/plain (text body -- kept)
>   text/html
> ---
> --
> _______________________________________________
> Rockhounds at drizzle Mailing List
> Subscription Services:
> http://lists.drizzle.com/mailman/listinfo/rockhounds
> List Home Page, with a link to the List Usage Policy:
> http://www.eclecticlapidary.com/Rockhounds/index.html