Re: [ATM] Persistent turned-up-edge in mirror

[Mike Lockwood <melockwo@uiuc.edu>]

Bern,

Bern Kosicki wrote:
> By "outer part", do you mean the largest radius of the mirror?

I mean the outer 1/8" - 1/2", the outer bit that dries quite quickly
after the lap uncovers it.  The width depends on the wetness of the
lap/mirror.

> I usually start off with a fairly wet mixture of CeO and water, but
> have been running it to be fairly "dry" near the end of a wet, like
> Texerau recommends.  However, I don't let it get very  dry.  Motion
> gets pretty stiff at the end of a wet (which usually ends about
> 15-30 min after the last addition of CeO).

Personally, I don't do "wets".  I start off with a generous mixture, 
but after a while it is less wet, and then I maintain what I have 
learned is the appropriate "wetness" of the work.  This is dry enough 
to have good friction, but wet enough to keep the whole mirror wet and 
minimize the drying of the edge.

I add cerium without separating the tool and mirror or stopping to 
press, and I start polishing again immediately.

	Mike Lockwood


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