"Luigi Zanasi" wrote in message
...
On Oct 8, 1:41 pm, "Bill" wrote:
In gluing boards together to make a 30" by 7' top, a few months ago,
someone
(sorry, I don't recall who) suggested including a threaded steel rod to
guarantee strength. I just happend to pass by some today, so I came home
with a 72" piece, 3/8" in diameter. It occured to me that I could face
"alignment challenges" if try to use more than 1 steel rod, especially if
I
drill holes that are precisely 3/8". On the other hand, the steel rod (s)
may help with alighnment when gluing.

I expect to use 2 nuts on top of a washer at the end of each threaded rod
and cover them for the sake of appearence.

Bottom line: Do you advise, 1, 2 or 4 threaded (29") steel rods?

I advise 0 threaded rods. They are not needed and don't add anything.
If you need to align the pieces, use cauls.

Luigi

Might they add support around the machinist's vise, an area which would be
subject
to some pounding?

Bill