Re: [ATM] start...tool....

[Saqib Sajjad <saqibsajjad@yahoo.com>]

i think dental stone is a better option as suggested by 
everyone. mahmood gave me the idea of plaster of paris
as it was cheap and readily available.i'll keep everyone 
posted on my progress.

Saqib

--- Vladimir Galogaza <vladimir.galogaza@zg.htnet.hr> wrote:

> I would like to comment Richards recipes,
> 
> >The general approach is to make a plaster of Paris disk, let it
> completely
> >dry for a week out in the sun, coat the entire thing in fast drying
> (5:1)
> >epoxy.. use twice as much hardener as recommended.  After the epoxy has
> >dried, pour more epoxy on one side of the tool, lay the tiles on top,
> >pour/brush more epoxy on top of the tiles thereby filling in the gaps
> and
> >creating a solid bond between the tiles and tool.
> 
> There is no doubt that tool made this way will work. But amount of epoxy
> required will probably match the price difference between the plaster of
> Paris
> and dental stone while dental stone tool will take much less time and
> effort
> to be fabricated.
> 
> Second remarque is about using twice as much hardener as recommended.
> There
> are
> some very good chemists on the list capable of rectifying me if I am
> wrong.
> Epoxy and hardener work together in chemical reaction. The reaction is
> complete and
> final product is best if interacting parts are used in stoihometric
> amounts
> which is
> given by manufacturers recommendation. Surplus of epoxy or hardener
> remains
> in the
> final  staff unused (unpolimerized) and weakens the whole thing. Surplus
> hardener does not
> make final product harder or stronger.
> 
> Third, filling channels up with epoxy dispenses with advantage of having
> channels.
> More uniform distribution of grit and temporary storage for  glass
> already
> ground.
> 
> Regards
> Vladimir.
> 
> 
> 
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