Re: [ATM] ritchey cretians

[George Anderson <tillerman1@videotron.ca>]

HI Khail

My suggestion would be for you to do as one of my friends has done.
His stand can be tilted and was built (on wheels) to be the same height 
as his machine. When he is ready to test he removes any retainers from 
the machine and slides the mirror onto the test stand. The edge supports 
are then locked in place along with retainer on the top just in case. 
The stand is then wheeled over to his test station where the surface is 
then rotated from horizontal to vertical for testing.

George Anderson
Montreal Canada

Clear skies and good health

Khail Rosenberg wrote:
> Hi Bob,
>
> I have an ambition to never use machines to make my mirrors, but i think
> something for this size, i really will have no choice... I think i will make
> a few machines, will help if i want to make something bigger and better..
>
> And i have read about the diamond pads, you are right, even though grit can
> be relatively cheap, with such a large mirror i feel i will spend more on
> grit than the actual glass itself..
>
> Any advice on machines to actually lift and put it on stands? I do
> understand the concern of dropping the mirror, it will make a lot, a looooot
> of work really out the window...
>
> Any advice on griding or polishing, and then testing both primary and
> secondary will be greatly appreciated.
>
> I believe my course of action will be as follows:
>
> 1. Make the 48" glass x 4"
> 2. make the machines to grind the bad boy... any suggestions on HP for the
> motor? 20, should be ok?
> 3. get three flats made for testing all 48" x .75", i chose this because it
> can be made for a pretty darn good price, any comments on the thickness
> being too thin?? .75 is ok?
> 4. ASK ATMLIST.NET where to go from there.. after I already have a ground
> out mirror and one thats already polished to a sphear.. where to go from
> there??
>
> ..... any good step by step plans on the entire process I will be happy to
> donate many goodies to a convention, person, school etc...
>
> Thanks,
> Mikhail
>
>   


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