On Mon, 14 Feb 2011 12:48:17 -0800 (PST), sm_jamieson
A E Taylor
lists rubber sheet up to 1/2" thick you could sandwich two bits
together. They may even have up to 1" thick if you contact them. They
seem to have a vast range of stuff.
I've no connection with them except as a customer.
Do you know anyone with horses? Stables are often lined with heavy duty
rubber matting about half an inch thick, sometimes dimpled or ribbed one
side but that wouldn't matter. You might find someone has trimmed off a six
inch strip to fit their box. (I have a couple of such strips myself, but
they are used elsewhere). You'd need two thicknesses, of course.
I used to buy large, thick, dense foam rubber in kits for lining
instrument carrying cases from RS Components which contained two sheets
about that thick, as well as one thinner one. I don't have the part
number any more though.
On Mon, 14 Feb 2011 12:48:17 -0800 (PST), sm_jamieson wrote:
Prsumably to isloate any vibration? That is not quite as simple as it
might first appear to be. Best isolation is achived only when the
compliance of the softer material is "matched" with the applied
static and dynamic loads.
"Matched" is difficult to explain but at the extremes something that
is too "soft" will deform towards its elastic limit and become
"solid". Something that is too hard won't deform enough and transfer
the vibration like a solid.
You also need to ensure that any fixings don't "short circuit" the
exactly. I tend to use tap washers for this sort of thing, and find
them very effective, so I suspect an inch of rubber mat is both OTT
and much too stiff, unless its a big industrial fan.
Yes. In practice I've found that just 2 tap washers and 2 metal
washers on a PB screw do the job fine for extractor & ceiling fans,
despite the apparent potential for this.
On Wed, 16 Feb 2011 03:25:30 -0800 (PST), Tabby wrote:
I'd have thought tap washers too hard, at least the cheap plastic
jobbies that the sheds seem to sell these days rather than good ole
fashioned rubber ones. Even an old rubber one I'd have thought to
But with the arrangement you suggest you aren't short circuiting the
compliant layer, if you omitted one of the washers you would.
The potential for short circuiting comes from the side of the screw,
which is rigidly coupled to the wall, touching the fan casing. But
even on wall fans it hasnt been a problem in practice.
Re the tap washers, bear in mind the amount of movement required is
tiny. Assuming you dont have a blade broken off or something.
I got some cheap rubber mats from halfords to cut up, but I've had a
change of heart after reading the latests posts.
I will mount a piece of OSB to the wall using the washer system, then
so it again with fan against the board. 2 layers of isolation. Should
I'll take back the mats, or cut one and use a DIY rubber washer,
although I suspect they are too hard. I'll find some soft rubber
Well I've got some rubber fuel hose (8mm internal, 15mm external) to
some 8mm frame fixings and the rubber / metal washer arrangement, to
a piece of timber to the wall. Fan will be fixed to that.
Good, if its a very big heavy fan. I posted a reply, but it seems to
have not shown up, ie that while the screw touching the case can in
principle short circuit the damping, in practice its not happened.
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