Author
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Topic: Message for Ugo Grassi
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted October 04, 2004 08:18 PM
It's been my experience that many people do not know how to package heavy items like projectors for transit. First you need to assume that the package WILL GET DROPPED somewhere along the way. It is unreasonable to assume that the air freight companies are going to handle your pecious projector package with kid gloves. For a drop height of 30 ins onto concrete, and a projector about the size and weight of a GS1200 you will need a minimum of 6.0 ins thickness of 2.2 lbs/ft3 polyester urethane foam packing material around all sides of the projector to limit the drop g-force shock level to about 15g. I don't even know if any commercial cine projectors, such as the GS1200, can even withstand a 15 g shock load( which is the minimum damage threshold requirement for much military designed equipment such as aerospace electronics). I would assume that these projectors probably will not withstand a 15g shock load, and something, probably circuit board electronics or solder joints, will fail under this kind of shock force. So you probably need to increase the packing thickness to even more than 6 inches, maybe 9 ins or more to be safe. I know this sounds like a lot of packing material, and it will make for a very big shipping box, but believe me if you want to ensure safe transit these are the rules you have to follow. This is not my opinion, it's all calculated from the static stress properties of the packing material.
REF: Shock and Vibration Handbook- Harris and Crede Page 4-18, Fig 41.20. McGraw Hill Publishing Co.
-------------------- The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection, Elmo GS1200 f1.0 2-blade Eumig S938 Stereo f1.0 Ektar Panasonic PT-AE4000U digital pj
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