[ATM] Re: ATM Sub-Diameter Lap?

[Ray at J-Engineering.com (Ray@J-Engineering.com)]

Hi Jim and All,

I need to make an new lap anyhow.  Might it be easier to figure 8"
mirrors with a 6" lap, 8" or slightly bigger?  If I go with the 6", is
it worth channeling it?

Can one recover from a turned edge with the 6" lap?  I am looking for
the path with the best chances of success since I'm a first-timer.

Ray J


Jim Burrows wrote:

 > At 2004-01-18 13:44 -0600, Ray J wrote:
 >
 >> I will soon be making a new lap to figure an 8-inch mirror.  Unless list
 >> members advise differently, I'll be using a 6" lap.  Should I channel
 >> the lap, or just press it with fiberglass window screen between lap and
 >> mirror, or both?  Should the lap be on the soft side?  Mirror is
 >> currently nice and spherical with a good edge.
 >> Pics at http://j-engineering.com/ATM
 >
 >
 > According to the pics, they're just f/6.3.  Should be no problem
 > figuring with a full lap and Texereau's parabolizing strokes.
 >