Re: [ATM] Material for Tool

[Dave and Connie <dmatt@frontiernet.net>]

This is where I got the idea of filling the cat food can with cement and 
tiles for hogging out the mirror.

I will probably go with either hydraulic cement or portland cement for the 
tool.  I have the epoxy sitting around and aging so sealing with boat 
building epoxy is basically free.  It will eventually get tossed if I don't 
use it.  The sealing will prevent water absorbtion and associated size 
changes and will help to prevent the tool adding grit to the system.

Dave


At 07:22 AM 1/14/2008, Thomas A. Moulton wrote:

>Those holes are really not a problem, they are the result of bubbles
>that did not fully surface, grit will rinse out of them easily.
>
>You can also do as Bob May suggested and fill them with more dental
>stone powder...
>
>Jeff Lowe wrote:
> > From: Mark Holm <mdholm@telerama.com>
> >
> >> Subject: Re: [ATM] Material for Tool
> >>
> >> There are a bunch of reasons to skip the epoxy, including the fact that
> >> the method described here is cheaper.
> >> http://gotgrit.com/make_tool7.php
> >> Pictures are here
> >> http://gotgrit.com/make_tool1.php
> >>
> >> I suspect this is the method Bob May uses to get the job done in an hour
> >> or less.
> >>
> > Thanks Mark. The pictures on the first page show exactly why I use
> > epoxy. On the left hand side of the tool shown are numerous holes where
> > grit will get trapped. For me it has a way of waiting until I am at 5u
> > before falling back out. The sealing of the channels and the smooth
> > filleting of epoxy is reason enough for me to use it.
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> >
> >
> >
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