RE: vibration and SLA

From: Brand Allen-EAB009 (
Date: Thu Mar 01 2001 - 23:35:05 EET

Hey Jeff,

I have had our sla equipment within 70ft. of a vibration table for over six(6) years now. I have not had any sla quality issues/failures that I would associate with the table. I'm pretty sure that this is a standard piece of hardware, though not being sure, I want to point out that our vibration table has four(4) rubber, air-filled boots isolating it from the floor. I have paid close attention to the surface of the resin in our sla vats when our vibration table is in operation. I have concluded that the only adverse movement or ripples detected are inherent vibrations of the sla machine's own hardware and none associated with our vibration table.

Of course specifications of the vibration table are significant. Our table is rated at 4,000lbs of force and a velocity of 45ips.

There are three metal framed, standard sheetrock walls separating the vibration table from the sla lab. Percussion waves generated by the vibration table are an important factor I'm sure. A crucial consideration may be the absorption and insulating characteristics these walls provide.

I have heard mention of actually cutting out a perimeter of concrete foundation from around the vibration table and replacing it with some sort of rubbery, RTV like material. Of course the intent here is to prevent vibrations from resonating through the foundation. I personally think that this is an overkill.

Anyway, this has been my experience. I would be interested in knowing any experiences contrary to mine.


Allen W. Brand, Sr.
Technical Supervisor / Lab Manager
Motorola Energy Systems Group
1700 Belle Meade Court
Lawrenceville, Georgia 30043
Phone: 770-338-3088
Fax: 770-338-3455

-----Original Message-----
From: Narva, Jeffrey P []
Sent: Thursday, March 01, 2001 2:48 PM
To: 'rpml'
Subject: vibration and SLA

Our company has chosen to locate a vibration table within in about 60 feet
of our machine. I am trying to convince them not to do this but I am not
sure they want to hear what I have to say. My question is; has anybody had
any experience with excess vibration near their machine? They are telling
me that they will isolate this vibe table but I am still not sure. Any
comments and/or suggestions are greatly appreciated. Thank you in advance.

Jeff Narva
Raytheon Systems-Indpls

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