Re: [ATM] Mirror Cells - Springs vs. Push/Pull

["Don Clement" <clement.focuser@verizon.net>]

Arjan wrote:
>
> > However, I still don't know what Don's flexural U joint looks like in
his
> > collimation cell....
>
> I guess that you could make those for example by making cuts with a
hacksaw
> on opposite sides of the screw, almost meeting eachother at the center.
> Repeat the process 1mm along the screw, but at 90deg angle. The result is
a
> cross-coupling which gives some flexing but keeps axial position.
> I think you need to cut pretty accurately, down to half a mm or so,
> depending on the type of metal. If my assumptions are correct, I don't see
> where you need the lathe...

That is similar to how I made the compliant U joint.  I used a 5C V/H
indexer on a  vertical mill and made precision cuts using a 1/16" thick
slitting saw. The threaded rod was held in a 5C emergency collet that was
bored and tapped for the thread size, in my case 3/8-24 UNF. I made a cut
then indexed 180* and made a second cut on the opposite side leaving a web
across the diameter. I then moved axially 1/16" and indexed 90*. The last
cut was made after indexing 180*. The lathe is not used for machining the
threaded rod.

Don Clement
Running Springs, California

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