From: Dale Eason 
To: atm{at}shore.net
Reply-To: Dale Eason 


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I'm planning on doing a 16" F5 by hand.  I'm planning on using the
pipe cap method of hogging that Bob May describes.

I only have enough dental plaster to make about a 1" thick 16"
diameter tool for my 16" mirror.  Well this be ok for fine grinding
and figuring?

Should I make a full size tool or less for find grinding and polishing?

Most sites talk about making sure the blank is flat.  I have a plate glass
1.125" blank.  I have tested it for flatness by spinning a piece of
aluminum channel about 12 inches long on top of the blank surface.  On one
surface is spins freely.  On the other it will not.  This means that one
surface is slightly  concave and the convex.  On the convex surface there
are places were the end of the bar will raise from the surface about .02
inch when the other end is pressed down on the glass.  I cannot make it do
that on the concave surface.   I'm planning on using the concave as the
back.  Do I need to flatten
this surfaces more?

 If I need to flatten the back how do I do it?  Must I use a tool that is as
large as 1/2 the diameter. I won't have a tile tool until the rough
grinding is finished.

Dale Eason




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I'm planning on doing a 16" F5 by hand.  I'm
planning on using the
pipe cap method of hogging that Bob May describes.
 
I only have enough dental plaster to make about a 1" thick
16" diameter
tool for my 16" mirror.  Well this be ok for fine grinding
and figuring?
 
Should I make a full size tool or less for find grinding and
polishing?
 
Most sites talk about making sure the blank is flat.  I
have a plate
glass 1.125" blank.  I have tested it for flatness by
spinning a piece of aluminum channel about 12 inches long on top
of the blank surface.  On one surface is spins freely. 
On the other it will not.  This means that one surface is
slightly  concave and the convex.  On the convex surface
there are places were the end of the bar will raise from the surface about
.02 inch when the other end is pressed down on the glass.  I
cannot make it do that on the concave surface.   I'm
planning on using the concave as the back.  Do I need to flatten
this surfaces more?
 
 If I need to flatten the back how do I do
it?  Must I use a
tool that is as large as 1/2 the diameter. I won't have a tile tool until
the rough grinding is finished.
 
Dale Eason
Do you Yahoo!?
http://pa.yahoo.com/*http://rd.yahoo.com/evt=1207/*http://promo.yahoo.
com/sbc/">SBC Yahoo! DSL - Now only $29.95 per month!
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