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Discussion in 'The Basics, Starting Out' started by Legionnaire, Jan 19, 2018.
Yep, printing those blue vellum brings back some good memories.
Really appreciate the follow-ups. Much clearer now; thanks!
In aerospace, a part is "blueprinted" when it meets the drawing requirements, tolerances and all surface finishes, treatments etc... once it leaves the factory, the customer owns it. Once you send it to a good gunsmith, it can be machined, lapped and polished, but may no longer meet the engineering drawing requirements because we have removed material which may have taken it out of tolerance. Not that it hurts performance by tightening up the fit, squaring up to and aligning centerlines: that's truing it, but now may fall out of the original production "blueprint" dimensions/tolerances.