[ATM] spider rotation

[RC Stargazer (Dave)]

Dan,

Actually, the way that it's drawn, the assembly would still tilt, but with a
'center of tilt' or pivot point being in the center of the secondary mirror,
and the two curves following an imaginary ring around the secondary mirror.

If one was to change the curves to both concave or convex, the 'center of
tilt' would be in between the two curves, taking away the benefit of a
stationary secondary.

- Dave

> ----- Original Message ----- 
> From: <fundo at bellsouth.net>
> To: "Jerry" <wa4guu at verizon.net>; "'Jan van Gastel'" 
> <jhm.vangastel at wanadoo.nl>; <atm at atmlist.net>
> Sent: Wednesday, December 26, 2007 2:49 PM
> Subject: Re: [ATM] spider rotation
>
>
>> From: "Jerry" <wa4guu at verizon.net>
>>>
>>> Loosen the nut (part 4) and slide at parts 2 and 3 at the ends of the 
>>> hub
>>> tube tilting the rod (tuning fork tine) along a new radial from the 
>>> common
>>> center of the curve on parts 2 and 3. The center of those curves is at 
>>> the
>>> center of the mirrors surface.
>>
>> In order for the assembly to tilt as you say, then the curved piece at #3 
>> or #4 has to be the opposite of what is shown.  This would decenter the 
>> mirror.  Otherwise, #3 0r #4 has to be able to rotate perpendicular to 
>> the shaft.  This would leave it without support at whatever end.
>>
>> The diffraction spikes from 6mm vanes must be something to see!!!
>>
>> *****-----
>> Dan F.
>> Memphis, TN
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