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

["Vladimir Galogaza" <vladimir.galogaza@zg.htnet.hr>]

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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