On Saturday, May 16, 1998 2:04 PM, Mark Baines wrote:
>
> >Set the focuser on a table and add 8 lbs. of weight on top while alternately
> >increasing the pressure between the adjusting screws while the motor
> >is running. When the focuser lifts the weight, you have achieved the
> >factory setting.
> Excellent reply, thanks for that.
>
> >This is a good question. It would seem that having the four bearings on the
> >bottom might reduce flexure a bit.
> That made sense to me as it spread the load more.
>
> >In practice, I was not able to measure any appreciable difference in flexure
> >with the four bearings on top or the bottom. JMI's position is it doesn't
> >matter (yes, I asked), which agrees with my results.
> I see, thanks again. Strange that JMI didn't have a position on this. They
> placed their name on the body and underneath no one will see it :-)


I should say that when an engineering or application question arises
about a particular accessory or scope, my response is often based
on discussions directly with engineers involved in the design. This
provides the basis for my response, tempered with personal experience
and experimentation. One would expect a marketing type response from
a sales or marketing manager, so you can see the value of having good
rapport with design engineers.

In this case, my discussions were with the engineers. JMI engineers
have a position on this- it doesn't matter. No doubt marketing should
want the JMI logo prominently displayed. I would place the logo on
both sides if id doesn't matter, which is what prompted me to ask.


>
> I think I might leave it as it is, with the bearings underneath and also
> place a small piece of tape over the drive shaft and adjustable bearings to
> stop dust/grit etc getting in as it's on top.
>
>
> Slainte mhath
> Mark
>
> --
> || Mark S Baines - Inver, Scotland
> || Linnhe Computing - Quality Atari Software
> || http://www.stsd.demon.co.uk/linnhe.html
>
>


--
Michael Hart
Husen Observatory

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