Re: ATM 16" blank thickness

[w2vy@xanthus.net]

>
>
>Dear list,
>
>after considering porthole glas and BVC I now intend to spend a lot of
money to get a DURAN blank. I am offered two blanks one with 58 and 
another one with 68 mm thickness for exactly the same price. Perhaps
 these are the last ones of this type avaiable here in Europe. Would
 the 68 mm peace be more easy to grind (avoiding "thin blank behavior")
 or should I aim for the somewhat less heavy blank (which would make my
 future sope somewhat lighter) ?
>
>Thank you very much in advance for your comments !
>
>Clear skies,
>
>Ilko

The 58mm (2.25") is a 7:1 Diameter to Thickness ratio and
The 68mm (2.67") is a 6:1 ratio...("Standard Thickness")

The 7:1 is hardly considered Thin, It might need a little
thought and care in the Mirror Cell but the grinding
would be no problem.

Use the lighter one!

Tom Moulton