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This is what you should do:
Instead of trying to put the blame on TM which is the supplier that you got your 80% from, correct? You need to find a quality plating house that has current approval status from Boeing, Lockheed Martin, Northrop, Honeywell, etc. and have an eddy current conductivity test performed on your lower. This will tell you beyond a shadow of a doubt what the alloy is. We do this where I work when we get parts in from a possible unscrupulous vendor and they don't provide material certs with their product. I would put money on it that your lower is 7075 AL alloy. There is no such thing as a 2024 AL lower. They don't exist. What does exist is plating vendors that don't know their arse from a doughnut hole. Most all qualified plating vendors do that kind of testing. I have worked in the aerospace field for over 40 years and I can tell you from experience, a good plating vendor can make or break you. Get your lower back without them doing anything else to it. Take it to a good qualified vendor (see above) have it stripped of the plating that the first vendor tried to apply then have it tested. Then have it grit blasted because when type III anodize is stripped, it could leave the surface finish a bit mottled. Type III anodize is very different from type I (chromic acid anodize) or type II (sulfuric acid anodize). To explain, if the drawing requirements require a MIL-A-8625 type III anodize thickness of .003, that means that .0015" of the anodize goes into the parent metal and .0015" goes on top.That is why when is is stripped, the part finish may be a bit mottled. Not to worry, your lower will be fine. As a side note, 2024 AL is used in a majority of commercial and military aircraft fuselages, landing gear, and flight control surfaces. It is NOT "cheap" aluminum. It is very strong and the guy that told you it was inferior is an idiot. Bottom line...take your lower to an approved plating vendor, have it tested, then have it plated to the proper specification which is MIL-A-8625 type III. Your lower is fine.Comment
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You keep saying that it is a "known inferior product" yet you have no proof. If I was Nathan I'd be contacting my legal department about a possible libel suit since you are damaging their reputation by spreading conjecture that you have no proof of. Face the music, the anodizer you used screwed up. End of story.Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace. -- James Madison
The Constitution shall never be construed to authorize Congress to prevent the people of the United States, who are peaceable citizens, from keeping their own arms. -- Samuel Adams, Debates and Proceedings in the Convention of the Commonwealth of Massachusetts, 86-87 (Pearce and Hale, eds., Boston, 1850)Comment
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Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace. -- James Madison
The Constitution shall never be construed to authorize Congress to prevent the people of the United States, who are peaceable citizens, from keeping their own arms. -- Samuel Adams, Debates and Proceedings in the Convention of the Commonwealth of Massachusetts, 86-87 (Pearce and Hale, eds., Boston, 1850)Comment
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The OP has said his next and final post will be results of a metal test. No offense to anyone who has been still posting here but all of the recent posts have been basically what others have already said. Enough is enough. This thread has ran it's course until he posts the results so lets wait til that happens. You guys are just beating a dead horse now.
Last edited by TruEdge; 03-19-2014, 3:25 PM.The laws that forbid the carrying of arms are laws of such a nature. They disarm only those who are neither inclined nor determined to commit crimes.... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man." - Thomas Jefferson (quoting 18th century criminologist Cesare Beccaria)"Comment
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I'll have my TM lower back from the anodizer on Saturday. It's the same blem from the same sale as nil's lower. I'll post picssigpicComment
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"Kamala is a radical leftist lunatic" ~ Donald J. TrumpComment
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If you can send me a replacement lower I will consider this matter closed. All I want is a functioning lower.
And yet the OP asked TM for a replacement?
I guess it's true that he didn't directly state that here but it is highly indicative of his tone throughout the thread.Comment
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And who wouldn't be questioning both vendors trying to find the issue? The OP is still performing his due diligence (I think), and the request for a replacement may have been based on IF the lower was not 7075. Hopefully the lower is fine, and he can simply get it anodized somewhere else...Comment
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I am pointing out the inherent bias towards TM, nothing more, nothing less.
"Some implication" is way too kind. He has explicitly named one vendor and not the other. He has requested replacement from TM explicitly. I bet we never get an explicit naming of the anodizer.Comment
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