Re: [ATM] Ritchey-Chrétien

["Khail Rosenberg" <mikhail.rosenberg@rosenbergtelescopes.com>]

ah, sounds good then... i just saw a 20hp on ebay for about 300 bucks,
thought no big deal... should be good enough if i have a 10000ft mirror then
:)

Cheers!
Mikhail


On 1/21/08, Stan Truitt <s.truitt@hawaiiantel.net> wrote:
>
> >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???
>
> Aloha,
>
> When working at Spectra-Physics I designed, built, and installed a
> 48" continuous polisher (planetary), for flat work. The lap surface
> was 48" diameter, and it had three 18" diameter septums, and a 28"
> diameter Zerodur conditioner plate in constant contact when
> polishing. All were independantly powered, and driven in synchrophase.
>
> The 48" spindle was powered by a 5 hp motor and was significantly
> overpowered, rarely going over 10% of capacity, except at startup.
>
>
> Hope this helps,
>
> Stan
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