"RE: [M]: 16" Mount Vibrations" in the Meade Astronomy Archive

Subject: RE: [M]: 16" Mount Vibrations
From: LaGuardia, Kristofer S.
Reply To: mapug@shore.net
Date: Mon Apr 23 05:47:25 2001

While you're here, how about checking out the Astronomy Book List ?

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Just please remember to check local laws about the use of lead, or make sure
you will not be contaminating your own groundwater. I know I plan to make a
ten foot pier that will go ten feet into the ground and I know the city
would love to hear of me filling that with lead. I'm going for just
concrete, or sand. :)

-----Original Message-----
Sent: Friday, April 20, 2001 8:35 PM
Subject: Re: [M]: 16" Mount Vibrations

Try lead shot. It is still used for trap shooting you can buy it in size
9 it will do wonders as to maintaining a stable setup. It is also used
in the weight bands they sell for exercising. Add about 200 lbs of that
stuff and it should not move much.

dray

Bert Mettier wrote:
>
> "R. A. Greiner" schrieb:
>
> > When you have vibrations that take as long as ten seconds to die down,
> > it is very likely a fundamental vibration of the OTA on the fork.
> > This is a very difficult problem to solve.
> >
> > Vibrations of this type in a 12" LX scope are described in some detail
> > on my web site under the topic of mechanical concerns. You might find
> > it useful to read this material.
> >
> > Sincerely -- Doc G <http://www.mailbag.com/users/ragreiner>
> >
>
> Thanks Doc.
> As usual, your Info Site was very helpfull. Yesterday, I tested the drive
base
> and fork assembly of my 16" on its own after attaching it to a very stable
> workbench and it was almost impossible to induce any oscillations at all.
> Therefore, the main source for the vibrations seems to lie within the
mount. I
> plan to fill it with sand of a specific coarseness. My elder son is a
> Geophysicist specialized in earthquake research and I expect him to come
up
> with the answer as to which grain size would dampen vibrations best. Joe
> Hartley of this group suggests Carpenter's sand.
> Thanks again for your help.
>
> Bert Mettier

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Just please remember to check local laws about the =
use of lead, or make sure you will not be contaminating your own =
groundwater.  I know I plan to make a ten foot pier that will go =
ten feet into the ground and I know the city would love to hear of me =
filling that with lead.  I'm going for just concrete, or =
sand.  :)

-----Original Message-----
 From: D. Ray East [<A =
 Sent: Friday, April 20, 2001 8:35 PM
 Subject: Re: [M]: 16" Mount Vibrations

 

Try lead shot. It is still used for trap shooting you =
can buy it in size
 9 it will do wonders as to maintaining a stable =
setup. It is also used
 in the weight bands they sell for exercising. Add =
about 200 lbs of that
 stuff and it should not move much.


dray


Bert Mettier wrote:
 > 
 > "R. A. Greiner" schrieb:
 > 
 > > When you have vibrations that take as long =
as ten seconds to die down,
 > > it is very likely a fundamental vibration =
of the OTA on the fork.
 > > This is a very difficult problem to =
solve.
 > >
 > > Vibrations of this type in a 12" LX =
scope are described in some detail
 > > on my web site under the topic of =
mechanical concerns.  You might find
 > > it useful to read this material.
 > >
 > > Sincerely  --  Doc G   =
<<A HREF=3D"http://www.mailbag.com/users/ragreiner" =
TARGET=3D"_blank">http://www.mailbag.com/users/ragreiner</A>>
 > >
 > 
 > Thanks Doc.
 > As usual, your Info Site was very helpfull. =
Yesterday, I tested the drive base
 > and fork assembly of my 16" on its own =
after attaching it to a very stable
 > workbench and it was almost impossible to =
induce any oscillations at all.
 > Therefore, the main source for the vibrations =
seems to lie within the mount. I
 > plan to fill it with sand of a specific =
coarseness. My elder son is a
 > Geophysicist specialized in earthquake research =
and I expect him to come up
 > with the answer as to which grain size would =
dampen vibrations best. Joe
 > Hartley of this group suggests Carpenter's =
sand.
 > Thanks again for your help.
 > 
 > Bert Mettier


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