re: Fine-pitch allthread?

Fine pitch screw and nuts are use in optical work a lot, some vendors carry
them.
For example, try New Focus www.newfocus.com or
Newport Corporation www.newport.com

screws like 1/4-127, 1/4-100 are pretty common. These are rolled SS, with
brass nuts.

Can't find the latest one, a new manufacturer has some 1/4-200 screws.

These vendors also frequently carry differential screws if you need really
fine motion, those look more like micrometer heads instead of all thread.

I use the New Focus ones, they work very well. Their motorized ones claim
10's of nm (that's nanometers) resolution.

regards-
Elliot B.

From: Randy Gordon-Gilmore <zephyrus@...>
Subject: Fine-pitch allthread?

Hi all,

I'm looking for some fine-pitch (40tpi would be fine, finer would be finer)
1/4" allthread to make a small, ultra-fine resolution leadscrew. Does
anyone know if such a thing exists? I haven't found any in the usual
places--MSC, McMaster-Carr, Small Parts, etc.

Thanks,

Randy

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