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    Legacy Member ActionYobbo's Avatar
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    why did they cut the threads

    what is the purpose of this cut in the threads (see red arrow)
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    1ATSR 177AD & 4/3 RNSWR

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    A Collector's View - The SMLE Short Magazine Lee Enfield 1903-1989. It is 300 8.5x11 inch pages with 1,000+ photo’s, most in color, and each book is serial-numbered.  Covering the SMLE from 1903 to the end of production in India in 1989 it looks at how each model differs and manufacturer differences from a collecting point of view along with the major accessories that could be attached to the rifle. For the record this is not a moneymaker, I hope just to break even, eventually, at $80/book plus shipping.  In the USA shipping is $5.00 for media mail.  I will accept PayPal, Zelle, MO and good old checks (and cash if you want to stop by for a tour!).  CLICK BANNER to send me a PM for International pricing and shipping. Manufacturer of various vintage rifle scopes for the 1903 such as our M73G4 (reproduction of the Weaver 330C) and Malcolm 8X Gen II (Unertl reproduction). Several of our scopes are used in the CMP Vintage Sniper competition on top of 1903 rifles. Brian Dick ... BDL Ltd. - Specializing in British and Commonwealth weapons Specializing in premium ammunition and reloading components. Your source for the finest in High Power Competition Gear. Here at T-bones Shipwrighting we specialise in vintage service rifle: re-barrelling, bedding, repairs, modifications and accurizing. We also provide importation services for firearms, parts and weapons, for both private or commercial businesses.
     

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    Contributing Member Woodsy's Avatar
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    It is a place for crud to ooze into (as shown in your photo) and allow to bolt to go into battery when the rifle is dirty and circumstances prevent you from cleaning it (like when someone is shooting at you!).

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    I've got a funny feeling that that is the starter for the cutter as it cuts the extractor way. The extractor way can't be cut from the rear so has to be cut from the front as the body tilts to accommodate the shape. Just thinking on my feet but that's why a rifle is ZF when it is damaged externally at that point.

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    Quote Originally Posted by Peter Laidlericon View Post
    I've got a funny feeling that that is the starter for the cutter as it cuts the extractor way. The extractor way can't be cut from the rear so has to be cut from the front as the body tilts to accommodate the shape. Just thinking on my feet but that's why a rifle is ZF when it is damaged externally at that point.
    that would be logical if the extractor cut was not on the other side
    1ATSR 177AD & 4/3 RNSWR

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    Advisory Panel Lee Enfield's Avatar
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    It's a fairly common artifact in (all types of- Marlin lever actions for instance-) receivers, usually from a broaching operation.

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    Contributing Member Woodsy's Avatar
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    I have just examined 6 FAL bodies I have lying around. The groove aligns perfectly with the upper left corner (looking forward) of the squared bolt recess in the receiver ring, so it has clearly been formed as part of the broaching process to form the bolt recess. There is also another similar groove on the opposite side. The extractor recess has clearly been cut from the rear of the action with a special end mill as it comes to a square blind end before the barrel thread, and the axis of this cut is angled upwards towards the rear by about 10 degrees. This extractor cut could only be made by a special fixture and custom tooling in a milling machine.

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    Quote Originally Posted by Woodsy View Post
    I have just examined 6 FAL bodies I have lying around. The groove aligns perfectly with the upper left corner (looking forward) of the squared bolt recess in the receiver ring, so it has clearly been formed as part of the broaching process to form the bolt recess. There is also another similar groove on the opposite side. The extractor recess has clearly been cut from the rear of the action with a special end mill as it comes to a square blind end before the barrel thread, and the axis of this cut is angled upwards towards the rear by about 10 degrees. This extractor cut could only be made by a special fixture and custom tooling in a milling machine.
    by your description I assume these are not Lithgowicon produced bodies you have. I have several lithgows and they dont have any groove in the threads on the extractor side but the imbel's and FN's do (must be a metric thing).

    I wondered if it was a safety feature like a built in fail point because there is really no other practical reason for it to be there. That part of the bolt recess can be completed from the rear just like the extractor recess was done. To me it makes no sense to do the extractor side from the rear and then just finish off that corner from the front and run into the threads while doing it.
    Last edited by ActionYobbo; 02-04-2017 at 11:34 AM. Reason: spelling
    1ATSR 177AD & 4/3 RNSWR

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    Quote Originally Posted by Mr E View Post
    I wondered if it was a safety feature like a built in fail point because there is really no other practical reason for it to be there.
    It's just the way the machines did it, that's the direction it approached. The thread is not needed at that point. Do you sit up at night and think of things to worry about? Look up the sequence of machine work on their receivers and you'll find the answer...
    Regards, Jim

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    Quote Originally Posted by browningautorifleicon View Post
    Do you sit up at night and think of things to worry about? Look up the sequence of machine work on their receivers and you'll find the answer...
    my next step in machining is to do this area and I can find no information on these on the www. I dont want to waste time and effort making a fixture to set up to do that cut if its just window dressing but if it is a safety feature then I have to do it

    Last edited by ActionYobbo; 02-04-2017 at 12:00 PM.
    1ATSR 177AD & 4/3 RNSWR

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    Legacy Member Bruce_in_Oz's Avatar
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    No Mister E. what you have there; a good start!

    May the swarf be with you!

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