Re: [ATM] Eyepiece changes and balance problems

[DHA352@aol.com]

Size of bearing pads is one of many adjustments recommended in "The  
Dobsonian Telescope" by David Kriege and Richard Berry. Refer to sections  10.3.4.1 
and 10.3.4.2.
 
Clear skies
Don
 
 
 
In a message dated 12/17/2004 3:05:18 P.M. Eastern Standard Time,  
jerry.p.reddell63@sbcglobal.net writes:

I don't  think that increasing the size of the bearing does anything to
help...The  force required to move is directly related to the weight and  the
coefficient of friction... If I remember correctly the coefficient  of
friction is independent of the area or size..Thus weight is the key....  Now
if there is a 'tearing' like  effect that accompanies the bearing  material
in operation then maybe so.

Jerry  Reddell

-----Original Message-----
From: atm-bounces@atmlist.net  [mailto:atm-bounces@atmlist.net]On Behalf
Of Jim Miller
Sent: Friday,  December 17, 2004 12:45 PM
To: jeffmorgan@mindspring.com;  atm@atmlist.net
Subject: Re: [ATM] Re: Eyepiece changes and balance  problems


i've got 24" diameter bearings on my lightweight 18" dob.  i don't think just
making the bearings bigger solves anything unless it  serves to increase
friction or move the balance point higher.

btw,  friction, per se, isn't a bad thing. stiction is what you want to avoid
for  smooth movement.

good luck

jtm ( www.jtmiller.com for my  scope)

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