Re: ATM 2 inch filter threads - pitch?

[Krajci Tom Capt Det 5 <krajci.tom@barksdale.af.mil>]

From: Greg Granville <greg@laser.arl.psu.edu>

>I'm making a crayford focuser and I'd like to thread the bottom of the
draw tube
>to accept standard 2 inch filters. My lathe is capable of cutting
metric
>threads, but I don't have a metric thread-gage. (they appear to me
metric - or
>an oddball SAE thread)

>Anyone know what the thread pitch is?

Try  http://www.atmpage.com/thread.html

Tom Krajci