Any experience with sound/vibration- insulating the machine from it's base?

General CNC CNC Routers
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1

Any experience with sound/vibration- insulating the machine from it’s base?

Mine sits on a 10mm thick rubber sheet intended for washing machines.
4 M4 bolts go through this rubber into the wooden case that its mounted it.
(Plus a lot of acoustic foam lining the inside of the case.
This higher frequencies transported through the are are absolutely no problem. Tested and confirmed that by closing and opening the case with a sheet of foam. No difference. The vibrating case is the source.)

I get a lot of vibration transferred to the case. I can easily feel it with my hand.
Weighting down the case doesn’t help.
My thought is to use special rubber sleves that go between bolts and wall to insulate sound. But that’s just a wild guess and these things are very special and thus expensive.

2

Go to an auto store and ask for some cotton real exhaust mounts. They are basically two bolts with rubber between them, very like car engine mounts but much smaller. They are cheap and I can’t see why they wouldn’t do a good job for you. Never tried them so I don’t know for sure though but cheap enough for an experiment.

3

Exhouse pipes are light and hanging from the top.
Will they work supporting a large, flat base from the bottom?

4

They are supposed to be used with the exhaust sitting on them not hanging. They are also pretty commonly used as gearbox mounts. They come in sized from around 20mm diameter up to about 100mm. Since they are in compression and if you get a size applicable you could support a house with them. Can’t right now but I will find some and link you too them so you know better what I am on about.

5

Here is a selection with some different sizes http://www.ebay.co.uk/bhp/exhaust-rubber-bobbins lots of different variations avaliable.

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Thanks.
They look different from how the exhouse pipe is mounted on mine .
This makes sense.

7

You can also find these listed as “isolation mounts”. Mcmaster has a selection of M4 styles, but only offers the 50A durometer option, which may or may not work well for your application.

SDP-SI also has a pretty large selection to chose from: https://sdp-si.com/eStore/CoverPg/Vibration.htm

8

I tried casting my own with a Shore(A)13 firmness this weekend but it didn’t cure until I had to leave for the week.
The frequencies are pretty high, so I guess less firmness is required to be effective.

9

I have had quite a bit of success with sorbathane. McMasters has it along with many other online shops. Seems to be a common way to dampen vibrating machines in industry. Make sure to check the firmness level when you order, as they range from very hard down to quite soft and rubbery.

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There is no McMasters outside the US :wink:
What is “Sorbathane”? What frequencies does it absorb and what weight/thickness does it have?

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I have seen it from several millimeters to over a cm thick. I use it to reduce the noise of the table vibrating under my small CNC machine and 3d printers. Pretty sure its for sale on amazon as well as a few sites in the US and UK.