Question about the plunger on the No1Mk3 (and: another refurbed)

[louthepou]

Hi everyone,

While I refurbed this rifle: Refurbed No1Mk3* - Military Surplus Collectors Forums

A question occurred to me. On the No1Mk3, in the forend near the muzzle, there is a plunger with a spring. This plunger rests on the nose cap, and pushes upwards on the barrel. Doesn't this tend to make the barrel muzzle "want" to contact the top side of the hole through which it protrudes aat the front of the nose cap? I can't figure out the dynamics involved.

Lou

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[breakeyp]

Reading "Textbook of Small Arms, 1929" might prove enlightening. In short as a bullet moves down the barrel, the barrel vibrates and the muzzle moves in different directions. If uncontrolled, the bullet hits the target at different points due to the changes in position of the muzzle. The forestock spring loaded bearing point was a means of insuring that the muzzle/ barrel would be in the same position for each shot.

[Edward Horton]

louthepou

A plunger is what you use to unclog a toilet.

The "spring and stud" is the "duct tape" that creates "up pressure" at the fore end tip.

Why do I have a feeling you let your membership at the Possum Lodge expire.





Remember Lou, you can run but you can't hide.

[Thunderbox]

Hi everyone,

While I refurbed this rifle: Refurbed No1Mk3* - Military Surplus Collectors Forums

A question occurred to me. On the No1Mk3, in the forend near the muzzle, there is a plunger with a spring. This plunger rests on the nose cap, and pushes upwards on the barrel. Doesn't this tend to make the barrel muzzle "want" to contact the top side of the hole through which it protrudes aat the front of the nose cap? I can't figure out the dynamics involved.

Lou

Yes, the nosecap actually pulls the barrel back down again, in a correctly set up No1. There should be a tiny gap at the bottom of the aperture in the nosecap where the barrel protrudes.

When (c.1900) they chopped off the barrel of the Long Lee and lightened it for the future "short" rifle, they obviously ended up with a host of accuracy problems relating to bedding and barrel vibration - that was fairly new knowledge in those days, given that most preceding rifles had been fully stocked and bedded. The SMLE's complicated bands, springs & bedding points all appear to be fixes derived from trial-and-error. If WW1 hadn't come along and forced production of millions of No1s, I imagine they would have fairly quickly moved to a heavy-barrel No1 with much simpler bedding - an earlier version of the No1 MkVI and No4.

[bradtx]

Or perhaps a P13 Mk.?, Thunderbox.

Brad

[louthepou]

Thanks guys, quite helpful.

Ed, therefore I'll have to find some way to do without the duct tape on my recently acquired, number-matching Lithgow.

[Edward Horton]

Lou

Below is some "Sweet" information on "Orthodox bedding", the nose cap, spring and stud and inner band spring and screw are removed for this test of item No.8 below. Item No.8 explains how "tight/loose" the bedding in the draws area should be to allow the barrel to move away from the fore stock and allow the spring and stud to function and push upward on the barrel.



Also note the "Inner Band Screw" is only tightened until spring compression is felt. DO NOT over tighten the inner band screw, this can pull the barrel down too tightly and cause the rifle to shoot high. (Don't ask me how I know this)

Below, 1945 Enfield Australian parts manual (with "proper" nomenclature)
Lou, always remember the proper Verbiage.
(I stink, you smell)

http://ehorton.home.comcast.net/~eho...parts_list.pdf

[Peter Laidler]

Phew, I'm glad that someone else answered that! As apprentices, the lessons on harmonics, vibration and all the other properties of hollow tubes lasted an age so I learned it all parrot fashion. Later in more advanced mech eng. theory, this stood me in good stead because I could still quote it parrot fashion!

[breakeyp]

Phew, I'm glad that someone else answered that! As apprentices, the lessons on harmonics, vibration and all the other properties of hollow tubes lasted an age so I learned it all parrot fashion. Later in more advanced mech eng. theory, this stood me in good stead because I could still quote it parrot fashion!

Peter you learned it on the job, I had it in Engineering School and later had to acually use it in trying to calm down vehicle steering wheels and steering column shake in four cylinder cars at idle with the air conditioning one. Engineering is engineering no matter what the use.

[Edward Horton]

Phew, I'm glad that someone else answered that! As apprentices, the lessons on harmonics, vibration and all the other properties of hollow tubes lasted an age so I learned it all parrot fashion. Later in more advanced mech eng. theory, this stood me in good stead because I could still quote it parrot fashion!

Mr. Laidler

Harmonics in hollow tubes is all about up pressure and Viagra.