Re: [ATM] lap tool

["Bob May" <rmay@nethere.com>]

I've never really weighed tools  so I can't really say how heavy
that they should be but you do hae to remember that larger tools
will weigh a fair bit more than smaller ones.
I generally make the tools to be about  a ten to one or thicker
ratiio for stability.  Whatever the resultant weight is, is good.
You will be applying pressure to the tool anyway when driving it
back and forth across the mirror if you put it on top.  The
bigger the mirror, the less your pressure will affect the
pressure on the mirror so more needs to be on the tool itself.
Also note that the normal way to polish is with the mirror on the
top so the weight of the tool means nothing.
Also, when you pour your lap, just make sure that it makes
contact over most of the area and go to town with it.  Laps don't
need to be perfectly formed as they will quickly come into good
contact with the glass.  A region of two inches or less of an
area not making contact with te glass won't be seen by the
results of the mirror's surface.  The big thing is to ge the
glass polished to a sphere.  The jpitch, being a liquid, will
conform to the glass's shape supprisingly quick if the base of
the pitch is good and stable.
Bob May
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