Re: [ATM] Spherometer & Hogging with Diamonds

[Dale Eason <atmpob@yahoo.com>]

Darn Spherometer's are too hard to use I can't figure
out if I don't get the reading I want on a sphere is
the edge too high or the center point too low ;-)

Dale Eason


--- Jeff Lowe <lowe@nanotechsys.com> wrote:

> From: "Bob May" <rmay@nethere.com>
> > True about that but you're not putting the center
> measuring point
> > at the edge which is where the measurement is
> being done.  There
> > is a difference in doing it that way.
> > From: Dale Eason <atmpob@yahoo.com>
> >   
> >> You don't have to have a ring on the Spherometer
> to
> >> measure to the edge of a mirror.  A three point
> one
> >> works just as well.  Think about what happens
> when one
> >> of the legs is raised or lowered compared to all
> of
> >> the others.  You will see the reading change
> won't
> >> you.
> >>     
> Not only do you not /need /a ring type spherometer
> to see the edge,I 
> would say that you cannot use the ring type to see
> the edge. The ring 
> type will contact three points along it's diameter
> but the location of 
> those points is indeterminant. That the ring
> spherometer will not see 
> the edge  is especially true with a down edge as is
> seen in roughing. 
> The only reliable way to see changes at the edge is
> with a 3 footed 
> spherometer. The user can place two of the feet
> along the outer edge and 
> measure these changes in a very deterministic
> manner.
> -- 
> Jeff Lowe
> 
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> 



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