Blackbird
Topic Author
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Joined: Wed Oct 06, 1999 10:48 am

Chemical Milling

Sat Jan 05, 2008 2:55 am

Did Douglas, Convair, or Boeing use chemical milling on certain parts of the designs of their early jets?


AV Kent
 
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RE: Chemical Milling

Sat Jan 05, 2008 5:08 am

I don't know which specific parts would have been chemical milled, but I'd wager that they did. Chemical milling began to come about in the late 19th and early 20th centuries as an improvement to physical milling, which tends to place certain stresses on the billets. I believe that it has less of a negative impact on the physical strength of the metal than physical rolling or milling-the compression alters the molecular structures of the metal slightly.
"When a man runs on railroads over half of his lifetime he is fit for nothing else-and at times he don't know that."
 
Dalmd88
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RE: Chemical Milling

Sat Jan 05, 2008 7:49 am

I know Chem mill parts have been used on Boeing skins. There have been numerous crack problems on the 737 classics at the chem mill areas near the wing fairing area. If I recall there were also some Chem mill parts on Douglas aircraft.
 
tdscanuck
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RE: Chemical Milling

Mon Jan 07, 2008 5:34 pm



Quoting DALMD88 (Reply 2):
I know Chem mill parts have been used on Boeing skins.

I don't know about the early jets, but chem milling is certainly used extensively on the current Boeing production line aircraft. Fuselage skins are the most common area for it but it also shows up in other spots, like 747 floor beams.

Tom.
 
Blackbird
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RE: Chemical Milling

Mon Jan 07, 2008 6:56 pm

The B-707 and CV-880 used chemical milling, possibly to a heavy extent. Did Douglas make any use of milling on the DC-8 as they were contemporaries?

Andrea Kent

[Edited 2008-01-07 10:56:16]

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