Re: [ATM] FW: wire spider

["Vladimir Galogaza" <vladimir.galogaza1@zg.t-com.hr>]

Dominic,

>speaker attenuator coils.
What attenuator ? Do you mean "speaker voice coils" ?

>This can work great for precision alignment of optics.

In Fourier Transform Infrared spectrophotometers (FTIR), a moving mirror is
moved by the voice coil motor.

It is also proposed , in big systems, for the fine tuning
(adaptive optics  http://en.wikipedia.org/wiki/Image:Ao_movie.gif)
 precision is  not the only issue, speed is also  important.

Don Clement has recently  posted on the voice coil motors use.

Knife edge can be efficiently controlled by voice coil motor (actuator),
thus avoiding shaking the tester by touching the knob. Movement of the KE
is  precise and reproducible .

>I too have thought of ways to use strings, but did not like the
>problem that strings degrade a lot over time. On the one hand,
>there is what appears to be a tuner to adjust this. On the
>other hand, I would guess it will need to be adjusted often.

In some lucky humans hearing is very  tone sensitive. This is why musical 
(string) instruments
have to be often fine tuned. Wire spiders have greater reserve in required 
tension
before they require "tuning". They are more tolerant, while those
humans mentioned above are usually not.

Regards
Vladimir.



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