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Another drawing by the same person contains at least three errors. See if you can find them.
Benson_Slide_Stop.jpg
In fairness to the author, he did later correct the errors. But it took more than five years before that happened.
Hawkmoon
On a good day, can hit the broad side of a barn ... from the inside
I see a dimension that I remember differently, but I'd rather not say without looking it up.
To be fair... the army's own blueprints were still getting revised (read: corrected) around 8 decades, give or take a week, after the gun was adopted. They may be the only M1911/M1911A1 drawings we have, but they're not great. It's worth remembering that unlike the philosophical "chicken Vs egg" existential problem, in this case we know the pistol came several years before the [first usable] drawings did -- and they were reverse-engineered from the pistol.
Going back to the drawings, IMHO if someone sees fit to devote what must be untold hours upon hours to come up with something that is a bit easier to work with and offer it to the world for free, it's probably a good idea to thank them and politely offer constructive feedback, where appropriate.
Too many people miss the silver lining because they're expecting gold.
M. Setter
That was done here on this site several years ago when it was pointed out that the arrow showing the extractor bend direction was wrong. Mr. Benson replied that he was correct and that we were wrong. I immediately lost all interest in his drawings. My sole use for 1911 parts drawings is for the dimensions and when I find a dimensional error (one that differs from the Army Ordnance one) this casts doubt on the the accuracy of all the dimensions in an ersatz set of drawings - no matter how pretty they look.
So even with the checkered history of the M1911A1 and its Ordnance blueprints, they're the only ones I use for a source of dimensions. I even pay Picatinny Arsenals high fees for PDFs of some 1911 blueprints not otherwise available, just to get the data from what I consider the only reliable source - even if they don't look real pretty. I've never had any reason to doubt them and have found errors in versions by others such as Kuhnhausen and Benson.
P.S.: Even though the extractor bend direction arrow has been corrected on the drawing in Post #19, there's still something wrong with it.
When you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind. [Lord Kelvin]
Last edited by niemi24s; 10th July 2020 at 13:20.
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