25 Apr
2016
25 Apr
'16
3:08 a.m.
On Sun, 24 Apr 2016 21:07:23 -0500 o1bigtenor <o1bigtenor@gmail.com> wrote:
OK - - - so these are part of the rule changes from the late 50's. Its also when it went from NC and NF to UNC and UNF and there are lots of companies AND people that still use the old designation.
Rule changes this old shouldn't really be a problem for today's use though.
Regards
Dee
o1bigtenor, I am a mechanical designer, and I have not seen the terms NC and NF in anything other than my French's drafting book from 1941. English screws are UNC, and UNF. The threads on the bottom of your cameras are supposed to be 1/4-20BSW. -- Howard Gibson hgibson@eol.ca howard.gibson@teledyneoptech.com jhowardgibson@gmail.com http://home.eol.ca/~hgibson