[ATM] New with starters questions

["frog3@freeler.nl" <frog3@freeler.nl>]

Hello all,
i'm Joel, from the Netherlands, i'm new to the group.

i would like to ask a few things to help me on the way to building a 
first 20, 25 or 30 cm truss dobson telescope. (8", 10" or 12")

probably a 10" as this seems to be the best compromise for me at this 
time, regarding cost and final size, i would like to make it about F/5, 
so around 1250mm in the case of the 25cm.

first general question:
is it alright if i talk in centimeters and milimeters here? as it is 
easyer for me to think about than to think in the feet and inch conversions.

first atm question:
if i want a 25 cm dobson tlescope, should i make the mirrorbox about 30 
cm? or is this too small or too big? (roughly 2" more than the size of 
the mirror)

2:
What is better costwise: making a mirror out of a blank and having it 
aluminized and coated or buying the most inexpensive ready-made usable 
10" f/5  mirror?
and what will  both of these options more or less exactly cost?
and where should i buy it? here in the netherlands? or in europe? or 
doesn't it matter? what would be the best for the price including all 
shipment(s) and where should i 'shop'? and do any of the people of this 
list also sell atm supllies?

3:
I would like to make the , what i believe are called sidebearings, in 
sort of a half circle, instead of a circle, is this a lot more difficult 
to do than just a making a plain circle, or does it make no difference?

4:
does anyone have any drawings or plans (or how should i be calling this 
in particular? please help the novice) with exact sizes for everything? 
just to function as an example for me to 'draw on', because it's quite 
difficult to be doing this from scratch, or even a boook, that is what i 
find at least, i have the Kriege book of "The Dobsonian telescope".

5: (very important, so i'm not sure why it ended on place 5 ;)
what to make first? and when does the balancing of the telescope have to 
be done? which part is it that neds to be re-adjusted for the balancing, 
and therefore

6:
What am i forgetting?!..... :) ....very important to ask. :)

Thank you all,
Joel



-- 
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.9.9 - Release Date: 4/13/2005

_______________________________________________
ATM mailing list http://www.atmlist.net/