[ATM] Fwd: Pressing was Re: Oversize tools questions

["Matthew Fuchs" <matthew.fuchs@gmail.com>]

Oops forgot to include the list!

I'm curious on the methods for making the over sized pitch lap (set
up, pouring, initial forming etc).

Thanks
-Matt

On 11/26/06, Mel Bartels <mbartels@bbastrodesigns.com> wrote:
> So it was a natural that I (again accidentally, then afterwards purposefully
> as I investigated the literature) discovered that oversized laps controlled
> the edge.  This is easy to stumble into if the tool is a bit oversized
> (happens because one grabs a tool for an earlier larger mirror, pours pitch
> at the smaller current mirror diameter, then allows the pitch to squeeze
> outward as polishing progresses).
>
> Same thing when I discovered that channeling is unneeded for polishing and
> figuring.  Let the channels squeeze out and keep on going - don't stop!  But
> do keep the micro-faceting up - I scratch the pitch with something sharp
> every so often under cold water.  I scratch with 1/4 inch separation in 3
> directions at 120 degree angles - only takes a minute to refreshen.
>
> Mel Bartels
>
>
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