On Sun, 22 Jun 2008 16:05:54 -0500, F. George McDuffee wrote:
[...]
Another factor is the rampant excessive cost cutting which has
eliminated many essential engineering steps such as product design
review and drawing checking, so the customer cartoon with notes and
dimensions may not be producible, such as specifying a 1/2X20 [instead
of a 1/4X20] tapped hole in the end of [or through] a 1/2 ΓΈ shaft.
[...]
Yes, the practicality of that depends a lot on specified thread
fit, material tolerances, and equipment accuracy. Here's a
picture of a 3/8"-16 bolt threaded through a tapped hole in 3/8"
bar:
http://pat7.com/js/m/bolt-28.jpg which was one of half-a-
dozen such attempts before I decided it was a bad idea because I
couldn't center the hole consistently enough.
-jiw