Connect with us

Anti vibration grommets

Discussion in 'Electronic Design' started by Ian Bell, Jul 14, 2009.

Scroll to continue with content
  1. Ian Bell

    Ian Bell Guest

    I ant to mount a tube mic pre PCB on some anti vibrations grommets to
    reduce microphony. Anyone know of a UK source of these?

    Cheers

    Ian
     
  2. baron

    baron Guest

    Ian Bell Inscribed thus:
    If you only want a few, and are happy with salvage, then a scrap CD rom
    drive will provide what you want !
     
  3. Scott Dorsey

    Scott Dorsey Guest

    There are a bunch of possibilities depending on the mass of the board.
    The easy one is to take rubber grommets of the sort that appliances use
    for power cables, and just run a bolt through them. Those should be
    available from a local hardware store.

    It gets much fancier from that point, up to suspended shock mounts like
    the folks at http://www.gmt.gb.com or Engineering Dynamics in Andover sell.
    --scott
     
  4. DougC

    DougC Guest

    "Just any rubber" will not dampen vibrations.
    What you want is named Sorbothane (at least in the US).


    Good luck
    ~
     
  5. Rich Grise

    Rich Grise Guest

    Maybe check with Wallace? ;-)
    http://www.wallaceandgromit.com/

    Cheers!
    Rich
     
  6. Ian Bell

    Ian Bell Guest


    Thanks for that. I found this on their web site:

    http://www.maplin.co.uk/Module.aspx?ModuleNo=98863


    I have asked them what they are mode of and what size they are. Thanks
    for the tip.

    Cheers

    Ian
     
  7. Ian Bell

    Ian Bell Guest

    Yes, that had occured to me but the trouble is the bolt is not really
    tightened and may come loose in use or more likely during shipping - and
    you know of my recent shipping experience.


    I was thinking more of the grommets with a built in cylindrical hollow
    metal shaft so you could bolt down tightly to the shaft but the PCB
    would be suspended from the outer diameter of the grommet. I am suire I
    have seen these in old wireless sets.
    That's more like it. Their miniature buffers look very interesting.
    Thanks for that.

    Cheers

    Ian
     
  8. Ian Bell

    Ian Bell Guest


    They look really good, but the smallest I have found so far is M5.

    Cheers

    Ian
     
  9. Scott Dorsey

    Scott Dorsey Guest

    Right, you slip a piece of tubing over the bolt, then tighten the bolt down
    over the tubing.
    A lot of that stuff used to show up on the surplus market around here. I
    suspect if you can find a place where people still do manufacturing work
    that there is a lot of it.
    --scott
     
  10. Ian Bell

    Ian Bell Guest


    I found their web site, don't seem to have a UK distributor though -
    interesting none the less - I downloaded their brochure.

    Thanks for the tip.

    Cheers

    Ian
     
  11. Ian Bell

    Ian Bell Guest

    Hmmm, that might work really well. Just make the tubing slightly shorter
    than the thickness of the grommet so it gets compressed slightly. Now I
    just need a source of tubing.

    Cheers

    Ian
     
  12. GregS

    GregS Guest

    I don't know if Sorbathane comes in different varieties.
    The stuff I know is fairly stiff and not good for
    lightweight items. I like using the black foam rubber
    used for insulating pipes. Not the Polyethylene stuff,
    but the stuff that is very soft and does not spring back
    real fast. Kind of gummy. You can cut it up as desired. Try plumbing
    or home depts.

    greg
     
  13. Scott Dorsey

    Scott Dorsey Guest

    Sorbothane is a urethane polymer. You can order it in a whole bunch of
    different durometers. I don't know that it's better than any other urethane
    rubber, but they have outrageously good marketing.
    That's a urethane foam.... the air in it changes the properties a lot, though.
    --scott
     
  14. Ross Herbert

    Ross Herbert Guest

    :Scott Dorsey wrote:
    :>> Scott Dorsey wrote:
    :>>>> I ant to mount a tube mic pre PCB on some anti vibrations grommets to
    :>>>> reduce microphony. Anyone know of a UK source of these?
    :>>> There are a bunch of possibilities depending on the mass of the board.
    :>>> The easy one is to take rubber grommets of the sort that appliances use
    :>>> for power cables, and just run a bolt through them. Those should be
    :>>> available from a local hardware store.
    :>> Yes, that had occured to me but the trouble is the bolt is not really
    :>> tightened and may come loose in use or more likely during shipping - and
    :>> you know of my recent shipping experience.
    :>
    :> Right, you slip a piece of tubing over the bolt, then tighten the bolt down
    :> over the tubing.
    :>
    :
    :Hmmm, that might work really well. Just make the tubing slightly shorter
    :than the thickness of the grommet so it gets compressed slightly. Now I
    :just need a source of tubing.
    :
    :Cheers
    :
    :Ian


    A good source of brass tubing is your local model car/aeroplane hobby shop. For
    example
    http://www.oakridgehobbies.com/inde...tubing-strip-stock-sheets-rods-brass-aluminum

    You can also get decent nut-locking adhesive from the same source to prevent
    nuts coming off.
     
  15. Jim Thompson

    Jim Thompson Guest

    My local ACE Hardware stocks "hobby" sizes of brass tubing. Also
    Michael's, a craft store.

    ...Jim Thompson
    --
    | James E.Thompson, P.E. | mens |
    | Analog Innovations, Inc. | et |
    | Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
    | Phoenix, Arizona 85048 Skype: Contacts Only | |
    | Voice:(480)460-2350 Fax: Available upon request | Brass Rat |
    | E-mail Icon at http://www.analog-innovations.com | 1962 |

    I love to cook with wine Sometimes I even put it in the food
     
  16. Rich Webb

    Rich Webb Guest

    McMaster-Carr is the go-to place for this kind of thing. They do carry
    electronics-related as well (good price on Kapton tape) but have tons of
    mechanical piece parts. Not always the cheapest but reputable and good
    stock depth.

    http://www.mcmaster.com/ Search on "vibration mounts" and start there.
     
  17. GregS

    GregS Guest


    That always makes me think of the old boss. He said the MCS website was so
    much better at ordering than McMaster Carr. i'm sure he was right for what he was doing,
    but I never truely compared the two.

    greg
     
  18. GregS

    GregS Guest


    MSC MSC MSC



    greg
     
  19. krw

    krw Guest

    Anyone know of a good place to find hobby sizes of 1/2" aluminum
    angle, or channel? I need four ~12" pieces to mount a router lift in
    a table. Lowes here didn't have anything that small (the 1/2" part).
    But don't go on Sunday. It's run by those nasty Christians who
    believe their employees should spend time with their families. ;-)
     
  20. Ian Bell

    Ian Bell Guest


    Of course, craft stores are the place to look.

    Cheers

    Ian
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-