RE: ATM Building a Dobsonian, 2 Questions

["Scott Berfield" <sberfield@xbox.com>]

Sounds like a nice setup, but even if high precision, you will likely
want some sort of friction clutch set up to make it controllable. While
I am not a Dob user, on the occasions when I have used others' the
nicest thing about it was the smooth motion -- move it easily, but have
it stay where it is stopped. Too easy a rotation and you will have a
really cool looking weather vane. 

-----Original Message-----
From: owner-atm@shore.net [mailto:owner-atm@shore.net] On Behalf Of
Hugues.Laroche@ses-astra.com
Sent: Thursday, May 22, 2003 11:37 PM
To: hermit
Cc: atm@shore.net; Guy Brandenburg; owner-atm@shore.net; Steven Hammond
Subject: Re: ATM Building a Dobsonian, 2 Questions




Hi there,

>You wish. ;-)  Actually they are just plain crappy in this application,

>unless you can get something high precision.

Hm, interesting, I was preceisely considering some thing of the kind:

 it is a large ball-bearing-based ring that a local company can supply
in sizes up to a bit more than one meter. The normal ;-) use if those
seem to be for 2 axes trailers, where one axes can be rotated around a
vertical axis. They are dimensioned to support several
hundreds/thousands of Kg/lb (anyway, overdimensioned, that is).

Do you think it would have the same defaults as the mentioned lazy
susan?

TIA, and have a good week-end!

Hugues
Luxembourg, Europe



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