Re: Ferrell's mirror: tool questions

Bob Madden (madden@netcom.com)
Tue, 21 Mar 1995 15:21:26 -0800 (PST)

I surely do agree with Goeff. I was in the garage this morning looking at the duplicate blank I cast when we cast Doug's. I had placed it on some wood to allow air to circulate around it and removed them last night. I then placed the blank on some old news paper. This morning the paper was damp and it wasn't the California sunshine (rain), the blank has not cured fully yet.

Bob

):-{])) <---- madden@netcom.com madden@svpal.org Remember amateur astronomers: "keep looking for the next Universe"

On 22 Mar 1995, Geoff Dudley wrote:

> > Hello again,
> >
> > I've decided to follow Alan Kilian's lead and preface my mirror
> > making questions/updates with "Ferrell's mirror" for everyone's
> > convenience. From the responses I got I now feel comfortable that my
> > full thickness pyrex blank is OK--on to the tool. I have both the Berry
> > and Texereau books, but neither addresses plaster & tile tool making.
> > Bob Madden and I cast the tool for my 10" mirror Sunday. It's
> > about 1.5" thick dental plaster and turned out pretty well. I've set
>
> STOP! From bitter experience, I now know that you should wait at
> least a week, preferably two, before you epoxy the ceramic tiles.
> This is to allow the tool sufficient time to dry out. Otherwise there
> is the possibility of the tiles working loose.
>
>
>
>
> Best regards,
>
> Geoff Dudley
> gwd@stan.xx.swin.oz.au OR
> geoff@bedrock.ls.swin.edu.au
>