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Originally posted by goots
Why would you need strict tollerances for a missile?
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exactly my point: why WOULD you need strict tolerances for a missle? This question challenges the idea that the tubes actually meet strict tolerances at all.
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So are you in the aluminum tube business? How would they be packaged if they were for centrfuge's? |
Well if you need credentials, I am an engineer, though I am not specifically in the "aluminum tube business". My engineering knowledge tells me that for a centrifuge runing at 40000RPM you need DAMN PRECISE tolerances in order to ensure that the centrifuge is in perfect balance and doesn't create harmonic vibrations that would destroy the machine in short order.
In the context of aluminum tubes for this application, "precise tolerances" would include 20 cm diameter +/- 0.01 mm, 100cm length +/- 0.03 mm, an exact, PERFECTLY uniform wall thickness of 2-5mm (whatever it may be) +/- 0.01 mm, and PERFECT cylindrical shape, all but length being properties of precision aluminum extrusion. Further, the resulting tubes would probably be pre-stressed, perhaps forged - at least that's what I'd do.
From what I see in that image, and based on the dimensions you posted, I'd say it appears that they are packed 2-up (end-to-end) in rolled packing tubes. If it were me, and the application were as described above, I would pack them such that minimal stress is present on any given tube. I would accomplish this by running a packing tube through the center of each which is, say 120cm in length, and suspend each tube individually in a latticework of packing material that restrains the 10cm of excess at the end of each tube. This would ensure that each tube is perfectly preserved and not subjected to undo stress.
By contrast, I see a crate with a stack of "something" wrapped on the outside, butted end-to end, the bottom items clearly bearing the weight load of all those items items stacked above them - would you keep eggs in your refridgerator stacked in this manner?
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