From: "Russell Jocoy" 
To: JBHillman{at}ev1.net, atm{at}shore.net
Reply-To: "Russell Jocoy" 






>From: "Jerry B. Hillman" 
>Reply-To: "Jerry B. Hillman" 
>To: 
>Subject: ATM hogging tool
>Date: Mon, 24 Feb 2003 17:56:28 -0600
>
>
>Hi all,
>I think I've found something to use to hog out my 16" mirror. It is a disc
>brake disc. Automotive type.  Flat surface about 6 inches in diameter. Nice
>handles to hold on to.  Just have to be careful not to bang the mirror with
>it.
>Also any hints about pitfalls when doing a 16" F4 - 4.5 would be
>appreciated. I hope to have my grit within a week and I have heard that a
>fast mirror is harder to do.  I'd love to make it a F6 or maybe F7 but I
>would end up not using it because of ladders in the dark.  Brittle bones
>and
>ladders don't go well together.  The last time I fell off a step ladder I
>broke 3 ribs.
>Any comments are welcome,
>Clear skies, Jerry
>
>
>
("atm{at}shore.net")

      Jerry,   Hogging out a 16" blank with a steel disc is all very well,
but it will take alot of grinding to get to f-4. Possibly 60 grit and at
least 80 grit. I saw last week you were asking about generating a
curve. I guess after looking at the websites advised you have decided
aginst going this way..??
      I generated a f-5 curve in a 5/8" x 10" plate glass blank using the
actual roc measure on a pivot
beam with a diamond wheel grinder at the radius point. The beam was an
aluminum square tube
mounted on a fixed pole , or wall, with the grinder mounted to the end
where the radius moves.
The fixed end had a pivot that would go from left to right, and the beam
had to stay level to the mount
where the glass was.  It is hard to tell you in words how I did this
process but  If you would like I
can send you some drawings and explanations. I know it seems like a long
way to go and for the
time and set up your disc brake drum just might take less time. But.. Once
you have grooved out glass
this way the old corn milling process seems like too much work.
                                                       RUSS JOCOY... may all
your spheres come true
("atm{at}shore.net")

_________________________________________________________________
MSN 8 with e-mail virus protection service: 2 months FREE*
http://join.msn.com/?page=features/virus

--- BBBS/NT v4.00 MP