Swing Mk 4 Bolt Stripping

[ovenpaa]

The use an odd number information came from R.G.C. Another thing, I would expect the spring stack to be considerably shorter than a normal compression spring, the springs should be able to rotate when the bolt is de-cocked so there is not tension on them.

[Hauptman]

Here's a pic of mine. There are 27 pairs of Bellvilles plus one flat washer at each end. The rear collar has about 2mm of free movement along the pin.
The rear cap when tightened just takes up the free play in the stack and compresses it by a thou or two.
It's certainly worth doing.

H/man

[Gaz]

Stupid question alert...

Why is the bolt lift/cocking stroke less heavy with the Belleville washers than with a conventional coil spring? Surely the same amount of energy needs to be compressed into the washer stack as with the spring, hence the same forces should be involved?

[Hauptman]

It's something to do with the characteristics of the Belleville stack, I think.
The force required to lift the bolt (and cock the action) can be adjusted more easily with Bellevilles, and the acceleration of the firing pin may be greater when released.
Perhaps RGC could explain the physics?

H/man

[R.G.C]

The use an odd number information came from R.G.C. Another thing, I would expect the spring stack to be considerably shorter than a normal compression spring, the springs should be able to rotate when the bolt is de-cocked so there is not tension on them.

The number of washers need to be odd for a simple reason of common mechanical sense:
The first one bears against the dry firing shoulder by the centre and the rear one bears against tje rear sleeve by tge outside, otherwise, this last one would be useless.

Washers are of a specific force and their number depends of the FP treavel mainy (33 for the Millenuum and the INCH with a 4mm FO travel, more for a Swing wirg 1/4 travel.

We had here qyute a number of Swings modidied to Bellevilles successfully here. Washers are not same as used for the CG, primarily because the FP is 1/4' as compared to the metric 6mm, reason why Hauptman had to alter the ID od rhe metric one..

Contrary tp the coil spring used at its maximum caoacity and alwayss under full compression, the discs springs are used at 60% of their maximal and are absolutely commpression free when decocked.

Alsp, the mving assembly can tgen be made much lighter; this refucing locktime.
g

R.G.C

[Mezzer]

I'm coming over all dizzy with these explanations and calculations. I think I'll probably just stick with the original spring ... which continues to work just fine tongueout

Mezzer