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wrote:

snip-de-dip)

I'll also suggest that there's no advantage to using acme thread in
this application. For a given size you get a coarser thread, which
means more movement per turn, but it's more costly and actually has
less strength since the threads are deeper.

Tim
(who's just designed a cradle for a 34' boat.)

But, but, but.....
In this application, the "bolt" is in compression, which puts the thread
in shear, which means that the broader thread base of the Acme is
WAAAAAYYYY stronger than a UNC thread.
Hence the fact that it is used in this application ;-)
Steve