ATM Al tubes: end rolling and wall thickness

[Curtis MacDonald <deepsky@union-tel.com>]

I have been using a 15" dia- 100" long tube on my 12 1/2" f/8 since the mid
70's without any problem. It's thickness is .078", so a would recommend the
.064 wall for your 10".  Also go with the 8" on the 6 if the cells will fit.


Curtis MacDonald
deepsky@union-tel.com



At 09:52 AM 12/14/99 -0800, you wrote:
>
>>Once the spider and mirror mount
>were put in, they added some extra structural strength to the
>tube (especially at the ends).....
>
>Parallax and Hastings both offer end rolling...this would seem to be an
>alternative to the door edge strips that's also supposed to add strength.
>On the downside, rolling also reduces the effective id at the ends,
>according to Hastings by as much as 1/2".  Anybody have their tube
>rolled?...does it help, and how much is the id reduced?
>
>Also, what wall thickness would y'all recommend for two scopes my friend and
>I are working on:
>
>6" f8, which will have an 8" od tube unless you can convince me that 7" will
>not have problems with tube currents; choices are .050", .064", .074"
>
> and 10" f6, which will be in a 12" od tube, with either .064" or .094"
>wall.
>
>Thanks!
>
>-----
>Matt Tarlach
>Carmichael, CA
>matttarlach@jps.net
>
>
>


Curtis MacDonald
deepsky@union-tel.com