Re: [ATM] tile tool sticking

["Norm Prince" <princenorman@bellsouth.net>]

That makes a bunch of sense...,and i don't know Horaces' situation but i 
have experienced the same thing, and by no means can atribute it to water 
absorbtion....When i make a tile tool I clear the channnels of plaster with 
a brass and then nylon wire brush...then seal the channels and edges of the 
tiles...From experience I can say that i submerge them in water without any 
bubbles coming out...they are SEALED, and the effects of abrasion you speak 
of are all but elliminated....any insight on what would cause the same 
effect with a tool that isn't sucking up water???

once again just curious to figure out what yall know that i don't...which is 
a boat load to be sure...

Norm Prince


----- Original Message ----- 
From: "Bob May" <rmay@nethere.com>
To: <atm@atmlist.net>
Sent: Sunday, November 04, 2007 21:00 PM
Subject: Re: [ATM] tile tool sticking


> Plaster, dental stone, hydrocal, cement, it's all the same in
> this regard.  The stuff is a bit porus and thus will adsorb water
> until it is full.
> Sealing it will stop the adsorption for a little bit but you have
> to remember that you have to get down into the stuff in order to
> do a real seal and that usually doesn't happen and you'll end up
> with patches where the sealing material gets worn away with the
> grinding process.  I'd rather not seal and thus get an even
> adsorption of the water over  the whole area rather than deal
> with spots of non sealed plaster, etc.  This will show up worst
> when you are almost done and on the very fine grits where there
> will thus be areas where the water goes through and those dry out
> and make for problems.
> Most of the tile tools are made and then used immediately and are
> often kept wet enough that the problem doesn't really exist for
> more than a few moments when you start up the next day.\
> I'll note that I sometimes do dseal the top of a tool at the end
> of the 3220 grit step just to keep the larger grits in the air
> holes from falling out and causing problems with the fine grits.
> A quick spray of paint of some kind, cheap three dollar can of
> paint is fine for this, and that all gets rubbed away on the next
> grit.
> Another little note. When you start polishing, don't put the
> mirror in a plastic bag unless you know that that plastic bag has
> not seen any abrasive material or you may end up getting
> scratches on it.  Even a wood box that hasn't been painted on the
> inside can carry6 grit around and destroy a good surface.  I know
> because I am working on a siz inch refractor at the moment and
> had been carrying the lenses aroun in a wood box.  Apparently
> grit fell off of the tool and/or the lenses and got jostled up
> onto polished surfaces when carrying the box around.  Word to the
> wise!  Keep things clean when dealing with polished surfaces.
> Bob May
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