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Equipment Discussions >> Classic Telescopes

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TCW
Pooh-Bah


Reged: 11/05/13

Loc: The North 40
Sound Deadening Material For Vibration Control new
      #6341897 - 01/28/14 09:12 PM

I am contemplating lining the pier of my Cave 12.5 inch mount with automotive sound deadening material to absorb vibrations. Has anyone tried this and if so how did it work?

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Bomber Bob
Carpal Tunnel
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Reged: 07/09/13

Loc: The Deep South, USA
Re: Sound Deadening Material For Vibration Control new [Re: TCW]
      #6341935 - 01/28/14 09:36 PM

Never tried it. But, for my old Jaeger's 5' steel pier, I cut a length of white PVC pipe, glued foam pipe wrap to it, and pushed that up the pier. It greatly reduced vibration.

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amicus sidera
Post Laureate
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Reged: 10/14/11

Loc: East of the Sun, West of the M...
Re: Sound Deadening Material For Vibration Control new [Re: Bomber Bob]
      #6342196 - 01/29/14 12:56 AM

That PVC pipe/ foam trick sounds like a winner; it would certainly tend to break up any natural resonance.

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bremms
Carpal Tunnel
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Reged: 08/31/12

Loc: SC
Re: Sound Deadening Material For Vibration Control new [Re: amicus sidera]
      #6343411 - 01/29/14 03:29 PM

Fill it with concrete. Sorry, I couldn't resist. You wanted to be able to lift it?? PVC/ foam trick is a GREAT low cost solution.

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TCW
Pooh-Bah


Reged: 11/05/13

Loc: The North 40
Re: Sound Deadening Material For Vibration Control new [Re: bremms]
      #6343851 - 01/29/14 06:22 PM

My pier is over 6" in diameter so I don't think the pvc/foam idea will work although I might be able to fill it with expanding foam.

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Bomber Bob
Carpal Tunnel
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Reged: 07/09/13

Loc: The Deep South, USA
Re: Sound Deadening Material For Vibration Control new [Re: TCW]
      #6343863 - 01/29/14 06:29 PM

"I might be able to fill it with expanding foam"

I initially consider fine sand, but the pier & mount were heavy enough already! Spray-in foam? That's probably an even better solution - maybe it would help prevent rust, too.


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TCW
Pooh-Bah


Reged: 11/05/13

Loc: The North 40
Re: Sound Deadening Material For Vibration Control new [Re: Bomber Bob]
      #6343880 - 01/29/14 06:33 PM

This is a portable mount so I need to keep it on a diet.

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Bomber Bob
Carpal Tunnel
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Reged: 07/09/13

Loc: The Deep South, USA
Re: Sound Deadening Material For Vibration Control new [Re: TCW]
      #6343907 - 01/29/14 06:41 PM

Lightweight polyester quilt batting is another option.

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Lane
Post Laureate


Reged: 11/19/07

Loc: Frisco, Texas
Re: Sound Deadening Material For Vibration Control new [Re: Bomber Bob]
      #6344181 - 01/29/14 10:00 PM

I lined a pier with dynamat extreme and it did not work nearly as well as I thought it would. I think the problem is that this material is designed primarily to kill long wave low level vibrations coming into the car from the road and tires, so you hear your audio system better. It also prevents rattles in the car panels from the subwoofer. So it works great in my car, but I don't think it does much to kill short wave vibrations and I believe those are the kind of waves that are the main problem with telescope mounts.

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PowellAstro
scholastic sledgehammer
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Reged: 10/14/09

Loc: Tennessee
Re: Sound Deadening Material For Vibration Control new [Re: Lane]
      #6344190 - 01/29/14 10:06 PM

You could get the inside of the pier coated with Rhino Liner. This will kill the vibrations. We use this in our shop and it does a great job when it Is used at about 3/16" thick.

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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: Sound Deadening Material For Vibration Control new [Re: Lane]
      #6345120 - 01/30/14 01:10 PM

Quote:

I lined a pier with dynamat extreme and it did not work nearly as well as I thought it would. I think the problem is that this material is designed primarily to kill long wave low level vibrations coming into the car from the road and tires, so you hear your audio system better. It also prevents rattles in the car panels from the subwoofer. So it works great in my car, but I don't think it does much to kill short wave vibrations and I believe those are the kind of waves that are the main problem with telescope mounts.




+1

Your car dampens the big, honking, violent vibrations of 3,000 pounds hitting a bump at highway speeds. At the scope, the trouble is the fast, little, gentle, but annoying vibrations of your nose tapping the eyepiece.


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TCW
Pooh-Bah


Reged: 11/05/13

Loc: The North 40
Re: Sound Deadening Material For Vibration Control new [Re: Lane]
      #6345189 - 01/30/14 01:34 PM

Nothing like real world experience. Thanks!

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ngc2289
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Reged: 04/13/05

Loc: Corpus Christi, TX.
Re: Sound Deadening Material For Vibration Control new [Re: Joe Cepleur]
      #6345491 - 01/30/14 04:06 PM

I use "GREAT STUFF" foam to fill voids in my mount center column. Works pretty good at dampening vibrations.

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amicus sidera
Post Laureate
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Reged: 10/14/11

Loc: East of the Sun, West of the M...
Re: Sound Deadening Material For Vibration Control new [Re: ngc2289]
      #6345539 - 01/30/14 04:31 PM

Foam that hardens in the pedestal functions differently from a PVC pipe with closed-cell foam wrapped around it. The former works by reducing the modulus of elasticity, basically making the column stiffer; the latter dampens vibrations by means of its elasticity, e.g., the compression/rebound properties of the foam. Either will work, dependent upon the application, although "ringing", i.e., relatively long-duration vibrations of low amplitude, can occur with hard foam.

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wfj
Pooh-Bah
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Reged: 01/10/08

Loc: California, Santa Cruz County
Re: Sound Deadening Material For Vibration Control new [Re: amicus sidera]
      #6345763 - 01/30/14 06:38 PM

Right Fred.

Stiffness damps vibration, usually higher frequency vibration by means of "scattering" its energy through multiple paths that statistically are destructive in interference. The paths come from geometrically diverse fibers or foam bubble contacts, the less elastic the better.

The "roll off" of this frequency is due to the size of the column. For low frequency in a column to be damped, it must be absorbed in the axial direction of the acoustic wave by a damping force. An example would be a column of a viscous substance (like oil which is heavy). In this case, the energy is in effect "refracted" in place by the substance.


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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: Sound Deadening Material For Vibration Control [Re: wfj]
      #6345776 - 01/30/14 06:44 PM

In cold weather, some foams stiffen, likely reducing the desired dampening. Memory foam, for example, would be a terrible choice.

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