RE: ATM mirrors

[Dale Eason <atmpob@yahoo.com>]

--- c f <quantemlp@hotmail.com> wrote:
> 
> Hello,
> I am setting up my first mirror, recieved a kit from
> www.mirrorkits.com, a 
> 1" x 6" blank and everything to make the mirror.  I
> have gone through the 80 
> grit and 120.  I have 3 pits left that are a little
> bit bigger than the rest 
> and I have dotted them with a sharpie and will grind
> them out later this 
> week.  I also need to make a spherometer to gauge
> any high/low spots on the 
> mirror.  my question is, with the lap, what is the
> timming of the stroke to 
> get a good figure,  once a second, one stroke per 2
> seconds?   

Stroke timing for grinding is not critical.  It is
only important during polishing. Because the way the
glass heats up during the polishing process.  Grinding
is a different process.

Dale

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