Re: [CAD_CAM_EDM_DRO] Fine-pitch allthread?

On Friday 04 July 2003 01:29, Randy Gordon-Gilmore wrote:

> I had thought of gutting a cheap micrometer for prototyping, but Ball
> Screws & Actuators in San Jose (as JanRwl suggested) does indeed make
> allthread in pitches as fine as 1/4-80. I knew of them for leadscrews, but
> was totally unaware that they made precision allthread!

One other method to consider is differential screws. Here's one link:

http://pergatory.mit.edu/rcortesi/portf/flextester/designing.htm

Some expensive ones you can buy:

http://www.photonlines.com/optosigma/screw.html

I used this type of mechanism on a mill that corregated .002" thick stainless
sheet metal. It required fine control of the space between the rolling dies,
but also had to exert tremendous force which ruled out fine threads.

Matt