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Thread: Reducing number of No.4 Barrel grooves to speed production?

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    Reducing number of No.4 Barrel grooves to speed production?

    This was bugging me. Weren't No.4 barrels broach cut with all the grooves cut all at once?

    Does the time savings come from simply having to remove less material per barrel, or does the time savings come from saving time making the broaches?
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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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    Useful article here:

    Firearms History, Technology Development: Rifling: Manufacturing: Broach Rifling

    Broaching requires a serious upgrade in machinery from the basic “single-tooth” cutter method.

    Once up and running, the production rate is quite high; the complex tool travels through the bore ONCE and the rifling is finished.

    The other contender is cold (hammer) forging, as developed by out Teutonic cousins. They had to come up with a production technique that could keep up with their consumption of machine-gun barrels. When you have a fleet of thousands of MG-34 and MG-42 (and several other) guns at “work”, the demand for replacement barrels is ferocious.

    The only fly in that ointment is the supply of suitable materials and machinery to make the mandrels and the rotary-hammer machines themselves.

    The US used broach-cutting for some production; one notable product was all of the National Match M-14 barrels.

    They also used a LOT of “traditional” machines.

    Meanwhile, also in the US, another method arose: “buttoning”. The idea dates back to the late 19th century. However, it languished until the engineers at Remington refined it in the early 1940s

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    Does that mean that all Enfield barrels single-point cut then?

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    If they were using machinery built to make SMLE barrels, quite possibly.

    If you have a shed full of "single-tooth" cutting machines, you can turn out a lot of barrels each day.

    A shed full of machines hauling broaches will rifle a LOT more, though.

    Part of the reason for the "two-groove" barrel was to greatly reduce machine time per barrel whilst using "conventional" cutters. Broaching a two-groove barrel would likewise involve a slightly "less-expensive" tool`

    Certainly, SMLE barrels of pretty much any denomination were rifled with "single-tooth" cutters; as for what happened in WW2 with No4 barrels? I don't have that paperwork.

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    Single tooth cutters - using a lot of machines!

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    The article in the link below I,ve always found it to be an excellent read and look at the picture of the P & W sine bar rifling machine made in 1885.......

    The Making of a Rifled Barrel, FirearmsID.com

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    There one for sale at the moment for £15K
    Regards Simon

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    The list of machining operations I have here from Savage says:
    Operation Sequence No.27
    operation #32A - rifle on Builders Rifling Machine
    type of tools:- ET-6 rifling head ET-6A wedge ET-6B wedge ET-6C wedge ET-250 hook cutter ET-287 shank
    Standard time for 100 Pcs 11.046

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    Quote Originally Posted by Simon P View Post
    There one for sale at the moment for £15K
    Any more info Simon ?

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    PM Sent
    Regards Simon

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