Re: ATM 6" Equatorial GEQ

["Guy F. Brandenburg" <guyfbran@erols.com>]

Asaf S.-T. wrote:

> Hi.
>
> I'm using the design for a 6" Equatorial GEQ from Richard Berry's book,
> but have a problem understanding what's every kind of bolt, and some
> Items like "Pine-Molding". There are also a lot of technical terms I
> don't understamd. I live in Israel, but know english from my parents.
>
> Help!
>

I have that book, and I spent about 2 years on 2 kibbutzim about 25 years
ago, so I remember a few Hebrew technical terms, having worked a lot with
my hands. But I cannot write in Hebrew characters on here. Can you?

Ani lo yode'a im ze ya'azor im ani cotev be'ivrit batzura cazeh. At one
time my Hebrew was pretty good, but it's been a LONG time.Pine-molding just
means wood (etz) that is 1 1/2" thick (ovi) and 1 1/2" wide (do they sell
wood in centimeters or in tzol (inches) in Israel?), approximately 37mm
wide and thick, but about 2 feet long (60 cm, or 24 inches). Its
cross-section would be a square, if you cut it.

Quarter-round moulding is similar, but what it means is this: Imagine a
cylinder of wood that has a diameter of 1 inch (25 mm), and is 3 feet (36
inches, or about 1 meter) long. Now cut this piece of wood into 4 parts,
the long way. You do not have 4 cylinders; you have 4 quarters of a
cylinder. Each piece will now have the same length, namely 1 meter, but
will look almost like a right triangle.

I will try to make a drawing of what it looks like if you look at it from
the end:

---------------------
|                      _-
|                   _-
|               _--
|       ___---
|__---

I am looking at the diagram on my page 95 of his book, labeled
"cross-section of the equatorial pier"m which is opposite to the list of
items to buy, on page 94. There is also another diagram on page 97, "cross
section of the equatorial head".  There are pictures of hex-head bolts. You
may have a different edition of this book, with different page numbers.

I have forgotten the word in Hebrew for hex-head bolts. They are like
screws, but the difference is that they are designed to take a metal nut at
the end. They have the same thickness all the way through.

By the way, I would like to recommend that you build a Dobsonian-mount
telescope instead. It's a lot easier to make, and much easier to use.
Chapters 5 and 7 are pretty good. There is also another book that has been
written, about making large Dobsonian telescopes. You might want to see if
you can get a copy. It's called "The Dobsonian Telescope: A Practical
Manual for Building Large Aperture Telescopes", and is by David Kriege and
Richard Berry. It is published by Willman-Bell, Inc, P.O. Box 35025,
Richmond, VA 23235 USA.Its ISBN is 0-943396-55-7. It is excellent!

But let me know if there are other terms you do not understand.