Re: ATM Restoring a 6"coude- Another question

[Assaf Berwald <meshoamam@yahoo.com>]

Bob,
I cant get the OTA closer to the axis. I was thinking
about moving the counterweight closer to the axis and
(right now its about 70 cm away from the axis). Even
if I can move the counterweight about 25-30 cm closer
to the axis it'll help a lot. This means I need to add
about 60% of so of the original one to maintain
balance. Tomorrow I'll measure the weight of the
original conterweight to know excacly how much more I
need. The original counterweight is a cylinder about
19.5 cm in diameter and 19.5 cm high which ,I think,
is made of iron or steel. My best estimate of its
weight is about 50 kilos (again, will make sure
tomorrow). Theres also a counterweight of similiar
dimensions at the bottom end of the OTA that
compensates for the weight of the objective end on the
DEC axis. Thats what making me think that an addition
of about 20-30 kilos to the RA counterweight will be
almost insignificant in terms of load on the RA shaft
and bearings.
BTW, I have no intentions of cutting the original bar
that holds the counterweight as I do any effort to
keep the scope in its original shape (the parts, at
least). I will take the original bar to a steel
workshop and ask for a similiar one but about 25-30 cm
shorter. The bar is about 34 mm in diameter and is
threaded to a plate that also holds the coude mirror
cell on its other side.

I will post results of the measrements as soon as I
have them.
Thanks again for your kind help,
Assaf B.

Thanks again 

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