[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]
Re: [ATM] ritchey cretians
Hi Mitchell!
Good input on the stand.. I think I will try something like that.. Have a
table that can be raised up using a jack or a hoist... that type, I dont
think i will ever want to take it off the actual table for quite some
time...
Not to sure about Embedded though, i looked at them a bit ago, and never was
able to contact the guy on there, i think its a VERY old site..
a cell design, I am thinking about it, i have pros and cons for it.. 1.
simply time, in designing a mold... will it be worth all the effort? and
mine will have a big hole in the center for the RC design.. Not too sure
about the matrix on it...
Cheers!
On 1/19/08, Mitchell R <funnybone101@embarqmail.com> wrote:
>
>
>
> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf
> Of
> Khail Rosenberg
> Sent: Saturday, January 19, 2008 12:22 PM
> To: Bob May
> Cc: atm@atmlist.net
> Subject: Re: [ATM] ritchey cretians
>
> 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
>
>
>
> Just a few quick ideas. For getting the mirror from machine to test
> you
> could build your test stand to tilt from flat to *near* vertical and
> somehow
> "push" the mirror from the machine right onto the stand if they are the
> same
> height.
>
> Also, 4" thick will weight a heck of a lot. I believe you said you
> can pour your own glass? You could try cellular if you wanted, like these
>
>
>
> http://www.embeddedrf.com/Lookinglass_Webpage_Files/Webbed_Backed/Webbed_Bla
> nk.html
>
> They go up to 48" sizes on that website. Or just a little thinner solid
> blank perhaps.
>
> Good luck!! I too hope to make a mirror "around" that size someday (my
> experience thus far consists of 3 mirrors between 4.5"-10" and F/ratios of
> 3.8-6.5) so still some way to go!
>
> Mitchell
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>
_______________________________________________
ATM mailing list http://www.atmlist.net/