Re: [ATM] General questions before getting starting on a 6F6.

[Mike Lockwood <melockwo@uiuc.edu>]

Anthony,

Anthony Anconetani wrote:
> You mentioned that I should use a glass tool for my first mirror. How
> critical is this recommendation?

Not very critical - it's just a recommendation.  There are fewer 
possible problems than with a tile tool, especially the very first 
tile tool that you make!

For hogging, some tile wears very quickly and you may grind through 
them.  A glass tool will wear at the same rate as the mirror.  It's 
also easier to clean between grits (again, something you have to pay 
more attention with with tile).

During fine grinding a tile/Hydrostone tool should be pre-soaked so 
that the dry tool it doesn't suck up all the water in a few seconds 
and then glue itself to the mirror (had it happen).

Using a glass tool, you also have a piece of glass to use for a pitch 
lap in the future.  A 6" is a nice subdiameter lap to use on a 10" or 
12" mirror.

So, for those reasons, it is my preference that an ATM make their 
first (small) mirror by grinding two disks of glass together.

> The reason I ask is that I would like to gain some experience with the
> hogging tool and tile tool techniques on a smaller mirror. I hope to
> then use that experience later on a 10 F6 (or possibly faster) mirror.

It's not that big of a jump.  You can learn it now or later.

	Mike L.

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