Re: [ATM] Started Hogging

["Mitchell R" <funnybone101@embarqmail.com>]

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Dave and Connie
Sent: Saturday, January 19, 2008 6:27 PM
To: atm@atmlist.net
Subject: [ATM] Started Hogging

I started hogging today.  What I am finding is that in 2-3 minutes I have a 
smear of mud on the mirror.  This is with about 1/2 teaspoon of 60 grit and 
a teaspoon or two of water.  I am using a plastic spoon to get the grit out 
of the bag so that it is sort of measured.  The water is a guess.  The tool 
does drag heavily if it gets too dry.

For the tool I took a 16 oz foam cup and cut the bottom out of it.  I put a 
bunch of 1/4" nuts on a board and put the cup over it.  The nuts were held 
in place with a thick smear of vaseline.  I then packed the cup with 
Quikrete #1240 fast set cement.  This gives me a 2-3 pound tool that I can 
get my hands on and put some pressure on.  Four nuts fell out today so I am 
going to epoxy them back in.

Score so far is about .022" deep in the center measured by slipping 6 
layers of 20 pound  paper under a straight edge.  7 layers makes the 
straight edge rock.  I have kept a band about 1" all around that has not 
been touched.  This is with 10-15 wets.  The first few tries did not have 
enough grit.

Target final depth is about .105" I am going to take it about .085-.090 
deep (hopefully tomorrow) with the 60 grit and then cast the tool out of 
the fast set cement.  .  After about a week I will epoxy coat it and glue 
on the tiles.  This is to make sure I don't lose any grit out of the tool.

For the bevel I used the piece of diamond grit sandpaper that came with the 
blank.  I backed this up with a piece of hardwood and wet sanded it in a 
bucket.  The whole job took about 15 minutes.

Does this sound about right?

Dave

Sounds like a plan, Interesting idea for a hogging tool. Forgive me missing
your post but what Size/Focal ratio is your mirror?

Mitchell 

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