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Anti vibration grommets

I

Ian Bell

Jan 1, 1970
0
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
 
B

baron

Jan 1, 1970
0
Ian Bell Inscribed thus:
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

If you only want a few, and are happy with salvage, then a scrap CD rom
drive will provide what you want !
 
S

Scott Dorsey

Jan 1, 1970
0
Ian Bell said:
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.

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
 
D

DougC

Jan 1, 1970
0
Ian said:
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

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


Good luck
~
 
I

Ian Bell

Jan 1, 1970
0
fredbloggstwo said:
Ian

a friend of mine had a similar problem on some V72 amps where the existing
mounts had perished. He got some replacements from Maplins - I don't know
the part number though. They are a small rubber mount with a M3 screw in
each end.

Cheers

Mike


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
 
I

Ian Bell

Jan 1, 1970
0
Scott said:
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.


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.
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

That's more like it. Their miniature buffers look very interesting.
Thanks for that.

Cheers

Ian
 
I

Ian Bell

Jan 1, 1970
0
Dave said:
One useful possibility: Well-Nuts. They're T-shaped rubber bushings,
with a small nut cast into the end of the stem. Very convenient and
easy to use.


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

Cheers

Ian
 
S

Scott Dorsey

Jan 1, 1970
0
Ian Bell said:
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.
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.

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
 
I

Ian Bell

Jan 1, 1970
0
DougC said:
"Just any rubber" will not dampen vibrations.
What you want is named Sorbothane (at least in the US).


Good luck
~


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
 
I

Ian Bell

Jan 1, 1970
0
Scott said:
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
 
G

GregS

Jan 1, 1970
0
"Just any rubber" will not dampen vibrations.
What you want is named Sorbothane (at least in the US).

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
 
S

Scott Dorsey

Jan 1, 1970
0
GregS said:
I don't know if Sorbathane comes in different varieties.
The stuff I know is fairly stiff and not good for
lightweight items.

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.
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.

That's a urethane foam.... the air in it changes the properties a lot, though.
--scott
 
R

Ross Herbert

Jan 1, 1970
0
: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.
 
J

Jim Thompson

Jan 1, 1970
0
: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.

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
 
R

Rich Webb

Jan 1, 1970
0
This looks like a good company. I wish they had that stuff at
Digikey.

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.
 
G

GregS

Jan 1, 1970
0
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.


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
 
G

GregS

Jan 1, 1970
0
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.


MSC MSC MSC



greg
 
K

krw

Jan 1, 1970
0
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).
Hobby Lobby stocks it at the local store. It is a large national
chain.
http://www.hobbylobby.com/stores/stores.cfm?page=1

But don't go on Sunday. It's run by those nasty Christians who
believe their employees should spend time with their families. ;-)
 
I

Ian Bell

Jan 1, 1970
0
Jim said:
My local ACE Hardware stocks "hobby" sizes of brass tubing. Also
Michael's, a craft store.

...Jim Thompson


Of course, craft stores are the place to look.

Cheers

Ian
 
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