Re: [ATM] Ritchey-Chrétien

["Norm Prince" <princenorman@bellsouth.net>]

Wow 20hp!!!!!...Is that much really needed???...I've never tried to move a 
48" mirror around on a tool with grit and water, but i know what a 5hp motor 
can pull from theatrical automation???...any one of you engineers out there 
want to clue me in on this just for my own curiosity???...I'm just a 
carpenter and a welder who likes to read and play with math.

-Norm Prince
Georgia, USA...land of at least one seriously under-educated atm.


----- Original Message ----- 
From: "Khail Rosenberg" <mikhail.rosenberg@rosenbergtelescopes.com>
To: "Vladimir Galogaza" <vladimir.galogaza1@zg.t-com.hr>
Cc: "ATM List" <atm@atmlist.net>
Sent: Sunday, January 20, 2008 11:20 AM
Subject: Re: [ATM] Ritchey-Chrétien


>I think perhaps i will build a machine ( 20hp) should be enough??? i will
> grind it initially until its about .1" away from where i want it to be on 
> an
> F/2 focal length.. then i shall randomize it by hand..
>
> On 1/20/08, Vladimir Galogaza <vladimir.galogaza1@zg.t-com.hr> wrote:
>>
>> Mitchell,
>>
>> >     **Quite the opposite actually. Machines do the exact same motion
>> over
>> >and over and over and over (I think you get it ;) so small errors are
>> >multiplied many times. With hand work no two strokes will ever be 
>> >exactly
>> >the same so they blend very nicely if you keep them all reasonably the
>> same
>> >length/pressure.
>>
>> Not exactly. Some machines  are controlled by clever programs and
>> instructed
>> iteratively what to do after intermittent measurements. Marti Koskimo our
>> friend,
>> made one. Not only machine but the program as well. What it can do is
>> beyond
>> wildest  hopes of hand made enthusiasts.
>>
>> Regards
>> Vladimir.
>>
>>
>>
>> _______________________________________________
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>>
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