Why are there different locking shoulder diameters?

deerollman · June 04, 2007, 18:56

Sure seems like manufacturing would have been a lot more simple if they were standardized.

Survey Punk · June 04, 2007, 19:29

Some are larger for wallowed out holes.

JB

doktor_ecchs · June 04, 2007, 19:40

Quote:

Originally posted by Survey Punk
Some are larger for wallowed out holes...

Shows all I know...

Thanx, JB...

(BTW, that would be "wallered" would it not? Where's you from, down on the coast or sumpin' ?

Wallowed. It don't even look right typed out...

)

as ever,
Dr. X

xcpd69 · June 05, 2007, 00:36

Thee are two different measurements to locking shoulders.

The locking surface thickness, to adjust for proper headspace and the shaft diameter where it penetrates the receiver walls.

The reason for the different sizes is to adjust for wear to keep the rifle in service.

USMC 0341 · June 05, 2007, 08:29

Any time you manufacture a mechanical device with more than one part there will be some amount of variation from one part to the next. This means that any group of parts assembled together will end up with some variation in dimensions from one point to another.

In the case of the FAL - should they have simply machined a surface on the receiver where the locking shoulder is - the distance from the face of the bolt to the shoulder in the chamber would vary depending on ;
a) how deep the chamber was cut,
b) where the threads in the barrel were cut,
c) where the threads in the receiver were cut, and
d) the distance from the threads on the receiver to the locking surface.

Since the total of all these dimensions will vary from one assembly to the next the designer of this rifle was very wise to include a replaceable part which could be made in different sizes to accomodate just about all dimensional variations.

Windustsearch · June 05, 2007, 09:14

The proper terminology is hawged out.

Survey Punk · June 06, 2007, 06:22

Quote:

Originally posted by doktor_ecchs

Shows all I know... Thanx, JB...

(BTW, that would be "wallered" would it not? Where's you from, down on the coast or sumpin' ?

Wallowed. It don't even look right typed out... )

as ever,
Dr. X

Yes, Doc, I stand corrected.

The humidity's gettin' to me. Too close to the ocean I suppose.
Hawgs are a commodity down here and have no relation to mechanical tolerances. Fortunately the wind isn't blowin' "that way".

JB

Bruce Allen · June 06, 2007, 08:16

The variable sized locking shoulder system is one of the greatest strength's of the FAL rifle.

Once the proper sized LS is installed in any FAL virtually all problems of other variables are resolved, and the measuring and installation can be done anywhere the proper equipment is present.

That cannot be done with any other MBR that has ever existed.

I think it is pure genius..

While I think highly of the M14 platform, headspacing is real chore, as is the G3.

Rifle_Guy · June 07, 2007, 17:56

"The proper terminology is hawged out."

I thopught it was "wallered out"

gman552 · June 10, 2007, 20:33

What is the correct angle for the locking shoulder?

doktor_ecchs · June 10, 2007, 20:36

What is the "ghetto method" for grinding the correct locking shoulder angle...?

as ever,
Dr. X

Radio · June 11, 2007, 01:34

1. Get in yo ride, bitch.

2. Drive round da crib wid your homeys holdin' da right do' open.

3. Get Shotgun to drag da LS on da street while yo' be a'truckin'.

4. Tell Shotgun to maintain the proper 11.75° angle or yo gonna bus' a cap in his sorry ass.

--Radio

June 04, 2007, 18:56	#1
deerollman Registered FALaholic #: 18699 Join Date: Nov 2005 Location: NC Posts: 3,126	Why are there different locking shoulder diameters? Sure seems like manufacturing would have been a lot more simple if they were standardized.

June 04, 2007, 19:29	#2
Survey Punk FALaholic #: 8380 Join Date: Dec 2002 Location: Blounts Creek, NC Posts: 4,159	Some are larger for wallowed out holes. JB __________________ "If innocence is no protection from the weight of criminal law, a crucial incentive to maintain innocence is lost" Fran Haga

June 05, 2007, 00:36	#4
xcpd69 Registered FALaholic #: 31 Join Date: Jul 2000 Location: Uranus Posts: 5,567	Thee are two different measurements to locking shoulders. The locking surface thickness, to adjust for proper headspace and the shaft diameter where it penetrates the receiver walls. The reason for the different sizes is to adjust for wear to keep the rifle in service. __________________ Mama, take this badge off of me I can't use it anymore.

June 07, 2007, 17:56	#9
Rifle_Guy Registered FALaholic #: 2295 Join Date: Jan 2001 Location: Chandler, AZ Posts: 498	"The proper terminology is hawged out." I thopught it was "wallered out" __________________ http://i245.photobucket.com/albums/g...member1102.png http://militarysignatures.com/signatures/member1102.png If arms are instruments of power then, in a republic, do they not, rightly, belong in the hands of the people?

June 10, 2007, 20:36	#11
doktor_ecchs Registered FALaholic #: 17863 Join Date: Jul 2005 Location: WNC Posts: 3,303	What is the "ghetto method" for grinding the correct locking shoulder angle...? as ever, Dr. X __________________ The Golden Rule of History: Those With the Weapons Make the Rules!

June 05, 2007, 08:29	#5
USMC 0341 Registered FALaholic #: 988 Join Date: Sep 2000 Location: gpne Posts: 2,451	Any time you manufacture a mechanical device with more than one part there will be some amount of variation from one part to the next. This means that any group of parts assembled together will end up with some variation in dimensions from one point to another. In the case of the FAL - should they have simply machined a surface on the receiver where the locking shoulder is - the distance from the face of the bolt to the shoulder in the chamber would vary depending on ; a) how deep the chamber was cut, b) where the threads in the barrel were cut, c) where the threads in the receiver were cut, and d) the distance from the threads on the receiver to the locking surface. Since the total of all these dimensions will vary from one assembly to the next the designer of this rifle was very wise to include a replaceable part which could be made in different sizes to accomodate just about all dimensional variations.

June 05, 2007, 09:14	#6
Windustsearch Registered FALaholic #: 10219 Join Date: Apr 2003 Location: Seattle,Wa Posts: 5,696	The proper terminology is hawged out.

June 06, 2007, 08:16	#8
Bruce Allen Registered FALaholic #: 186 Join Date: Jul 2000 Location: SC Posts: 4,934	The variable sized locking shoulder system is one of the greatest strength's of the FAL rifle. Once the proper sized LS is installed in any FAL virtually all problems of other variables are resolved, and the measuring and installation can be done anywhere the proper equipment is present. That cannot be done with any other MBR that has ever existed. I think it is pure genius.. While I think highly of the M14 platform, headspacing is real chore, as is the G3.

June 10, 2007, 20:33	#10
gman552 Registered FALaholic #: 6335 Join Date: May 2002 Location: TX Posts: 1,863	What is the correct angle for the locking shoulder?

June 11, 2007, 01:34	#12
Radio Registered FALaholic #: 263 Join Date: Jul 2000 Location: Eastern Washington State Posts: 9,868	1. Get in yo ride, bitch. 2. Drive round da crib wid your homeys holdin' da right do' open. 3. Get Shotgun to drag da LS on da street while yo' be a'truckin'. 4. Tell Shotgun to maintain the proper 11.75° angle or yo gonna bus' a cap in his sorry ass. --Radio __________________ Train Like You Fight: Second PLace is NOT an Option. --E.M. (Ted) Dannemiller II* "You seem to fantasize about me a lot. Maybe you should tell your boyfriend? He could dress up like me or something." --*K.O.A.M.*, November 9th, 2009 "You're better off hoping she don't miss, it's quicker that way." --ce, December 15, 2009

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