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

["Arjan te Marvelde" <arjan.te.marvelde@hetnet.nl>]

Look at this:

http://home.hetnet.nl/~artm/atm/rft/spider.html

It is how I made my secondary cell, but in a beefed up version the design
might also be used as the collimation stage of a primary cell.

AtM

> I like that ball joint idea.  Ball joints are available in a wide range
> of sizes.  Little ones are used, for example in model airplane control
> linkages.  Many, or perhaps most, commercial ball joints have close to
> zero slop.  Perhaps one could also figure a way to incorporate a ball
> joint (maybe it is two ball joints) at one of the two adjustable
> corners.  Than would constrain in plane motion as well as axial.
>
> Compliant hinges look good for this as well.  One could tolerate higher
> bending stiffness in a compliant hinge for collimation than in one for
> flotation support.  If it takes a bit more torque to adjust collimation,
> that usually wouldn't be a problem.

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