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Aluminum oops shape.
An example of the element Aluminum

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Aluminum oops shape.
It's obvious why this chunk of aluminum ended up in the Boeing surplus store. See the bottom right corner? Someone was trying to machine out a nice rounded corner, and they set up the machine to turn the corner too soon: I'm guessing they failed to take into account the diameter of the cutting bit in calculating when the turn should start. The fact that they stopped the machine before it actually finished doing the wrong thing indicates it might have been a manually operated milling machine, which seems surprising considering how common CNC (Computer Numerically Controlled) machining is these days. A CNC machine would have gone ahead and really screwed up big time.
Source: Boeing Surplus Store
Contributor: Theodore Gray
Acquired: 11 August, 2007
Text Updated: 11 August, 2007
Price: $15
Size: 8"
Purity: 95%
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