Anit vibraiton mounts for a table

[remp]

Hi

I have a tablet press machine in the middle of a production room making tablets. Next to the machine (3 ft away) I have a desk with a weight scales on it for measuring etc...The desk is on 4 legs and bracketed to the back wall. There is a slight vibraiton coming from the floor when the machine runs and up the legs of the desk effecting the weight scales operation. The desk even has a slab on top with anit vibraiton pad under it, but it still vibrates the scales on this slab.
.
I was thinking of putting isolaiton mounts under the feet of the desk. Would this work?. How do I size/specify the exact type of anti vibraiton material I need. Is there a measurement on the desk I need to do first to check vibraiton frequency etc..?
Please help...!

 

[IRstuff]

Yes, you should measure the amplitude and frequency; otherwise, how would you specify the table? You might start by calling someone like:

http://www.techmfg.com/portals/lifescience.html

http://www.vistekinc.com/passive-vibration/vibration-isolation-tables

http://www.newport.com/Vibration-Control/988043/1033/content.aspx

http://www.kineticsystems.com/

http://www.edmundoptics.com/optomec...s-breadboards/vibration-isolation-tables/2480

Most of these are passive, but there are also active isolation systems from some of the same manufacturers. It all depends on your requirements and the depth of your pockets. You might also consider, again depending on your pocket depth, to placing either or both on isolated slabs. It's typical that high vibration equipment be mounted on their own isolated slabs, which decouples the vibration from the surrounding slab.

TTFN
faq731-376

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[GregLocock]

Put a carpet tile and a concrete paver under leg of the table. Adjust number of carpet tiles and pavers until you get sufficient isolation.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[GregLocock]

That's under each leg, of course

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

http://eng-tips.com/market.cfm?

 

[Compositepro]

Have you checked the settings on the scale? Most have adjustable or programmable electronic damping of the weight signal.

 

[Tmoose]

Once you know the frequency(s) of the vibration that is giving you trouble, a chart like this will provide some guidance about the static deflection of linear isolation mounts that is needed in order to reduce transmitted vibration reaching the scale.

http://jn-isolators.com/resources/vib_efficiency+chart.gif

If the system is tall then extra degrees of freedom than simple vertical translation must be considered.

If the production floor is a building's upper floor ( not on grade) then there is a good chance the floor flexibility is part of the problem. In any case it makes the simple charts invalid. Even greater static deflection is required.
This decades-old paper has been helpful for me.

http://www.mason-industries.com/masonind/_doc/pdf/ashlec.pdf

 

[drawoh]

remp,

I can see anti-vibration mounts on your table not working. How much stuff will be put on the tables? Will people work with their elbows on the table?

You might try isolating the scales themselves, in the manner of a record turntable.

--
JHG

 

[Twoballcane]

Ummm..how about moving the table to another room?

Tobalcane
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