Remington smithing note from a buddy

[butchlambert]

 

[WayneShaw]

And here I thought the pin prick was a hardness test.

 

[STS]

And here I thought the pin prick was a hardness test.

Me too.

 

[butchlambert]

Me too.[/QUOTE

Yeah, I learned something also.

 

[Phil]

Interesting.................................

 

[BigBlueandGoldie]

I've always wondered about this as well; does this mean Remington uses different thickness recoil lugs to set headspace?

 

[riflewoman]

They use a pull "through the bore" final reamer to set headspace. What these marks are may or may not have any implications for headspace as reamed but may have meaning for the depth of recess in the bolt so it can be adjusted after reaming perhaps?

 

[Riesel]

I would think that after the lugs are lapped or re-cut, the measurement become a mute point.

 

[STS]

I'll step out on a limb and take a swing at how I think those marks are used. I may be totally full of BS with my hypothesis. One of Remington's goals is to get a safe rifle built without going to expensive "hand fit" manufacturing practices. To that end it would make sense that a set of gauges may be available to compare one bolt to another and those bolts would be marked in some way ,such as the above example, so as to make it quick and easy for the assembly process to proceed without the need for time consuming measurements. I would guess that the bolts are gauged then marked accordingly and moved to the next step where they would be paired with a receiver. I would guess that the receivers have a similar gauge that yields information about the dimensions of it. The assembly process is a simple matter of picking a receiver with "short headspace" and mating it with a "long headspace" bolt. The efficiency comes from the ability to simply look at the bolt and know the range of dimensions that its in.
Just a wild guess on my part. May or may not be true.

 

[kendog]

I'll step out on a limb and take a swing at how I think those marks are used. I may be totally full of BS with my hypothesis. One of Remington's goals is to get a safe rifle built without going to expensive "hand fit" manufacturing practices. To that end it would make sense that a set of gauges may be available to compare one bolt to another and those bolts would be marked in some way ,such as the above example, so as to make it quick and easy for the assembly process to proceed without the need for time consuming measurements. I would guess that the bolts are gauged then marked accordingly and moved to the next step where they would be paired with a receiver. I would guess that the receivers have a similar gauge that yields information about the dimensions of it. The assembly process is a simple matter of picking a receiver with "short headspace" and mating it with a "long headspace" bolt. The efficiency comes from the ability to simply look at the bolt and know the range of dimensions that its in.
Just a wild guess on my part. May or may not be true.

This is what I'm thinkin also.

 

[butchlambert]

I will add that my Buddy has been a longtime (many years) authorized Remington warranty station.

 

[LarryDScott]

Different thickness recoil lugs come
into play in these assemblies. I used to get
lugs in large quantities from smiths, which
I resold. Sizes were available, many buyers
knew this in advance, because they would
ask for a certain thickness. LDS

 

[Ggmac]

Larry are you talking recoil lugs or bolt lugs ?

 

[Rustystud]

Recoil lugs are made in bulk, +/- tollerences. I see bolt lugs, and bolt faces all over the place. Almost all Tenon's have zero headspace, flush gauge and tenon end.
Nat Lambeth

 

[butchlambert]

Recoil lugs are made in bulk, +/- tollerences. I see bolt lugs, and bolt faces all over the place. Almost all Tenon's have zero headspace, flush gauge and tenon end.
Nat Lambeth

Nat I'll bet they make the receivers, bolts, and barrels in bulk, you reckon?

 

['Freak]

So, what exactly does “BALD LUGS NO MARKING .002 INCH TO .003 INCH UNDER STANDARD” mean? Is it that the distance from the backside of the bolt lugs to the bolt face is .002” to .003” less than “standard” length?

 

[Rustystud]

Butch, Your right, what I was meaning they are not individually machined as in the old days. They are made in bulk to close tolerances then final fittings by turning the bolt lugs. In other words the barrels are chambered first, and the actions fitted to the chambered barrel. When a gunsmith fits a barrel, the barrel is fitted to the action, them chamber is fitting to adjust the headspace.

In doing it the way Remington is doing it, they have forgotten about primary extraction. I have not seen a new model 700 with less than .025" gap between the bolt handle and rear bridge when in battery. Most are between .032" and .035" . This in conjunction with a design change where the back edge (extraction cam) of the rear bridge has been moved counter clockwise .065" from the original 1963 drawings.
Nat