On Wed, 01 Oct 2008 20:13:00 -0500, "Pete C."
wrote:


Wayne wrote:
snip

I'm not real sure the advantage of multi lead, but they do exist, and
yes looking at the end you do see the multiple starts. I seem to recall
that the TPI number counts all the leads, so the turns per inch is the
threads per inch divided by the starts.

They're commonly used on fly presses, even 3 and 4 start, to get the
downward speed for the strike.

Pete Keillor