Bushing firing pin?

WSnyder said:
Borden method.
Click to expand...

I have always preferred the threaded plug over trying to achieve a press fit that will last forever.

It is possible to achieve a press fit, but it needs a whole lot more precision.
And the heating and cooling required for a truly permanent press fit are NOT
all that good for the heat treat on parts.
 
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brickeyee said:
I have always preferred the threaded plug over trying to achieve a press fit that will last forever.

It is possible to achieve a press fir, but it needs a whole lot more precision.
And the heating and cooling required for a truly permanent press fit are NOT
all that good for the heat treat on parts.
Click to expand...


You reckon? Do you have any way to verify this?
 
Instead of heating the bolt could you work fast and set the bushing on dry ice and then press fit it or couldn’t you work fast enough with that tiny piece? Freeze the ram of the press?
 
brickeyee said:
I have always preferred the threaded plug over trying to achieve a press fit that will last forever.

It is possible to achieve a press fir, but it needs a whole lot more precision.
And the heating and cooling required for a truly permanent press fit are NOT
all that good for the heat treat on parts.
Click to expand...

I don’t believe there is any heating involved.
The original BAT DS actions had a removable piece. Not sure when this changed but I suspect when the bronze bush was also removed from the production units.

Never seen one move in an early BAT DS action

Michael
 
Last I knew Kelbly’s offered 3 different firing pin diameters custom to fit that bolt . At one time I had 6 Pandas with a combination of different diameters. Even though they had different diameters all bolts head spaced to the same thousand if the bolts were swapped to different actions. But that firing pin had to stay with its original bolt.

I never could detect any advantage of one pin diameter over the other even on loads with Rl10x that I’m sure went over 75,000#.

.
 
Bushed bolt

I’ve had a couple Remington bolts bushed by Mike Bryant, fantastic work at very reasonable prices! Plus... pierced primers are a thing of the past for me!
 
Post #25 question

Michael Huebner- I am not understanding you comment about early BAT DS actions, I have 3 BAT DS actions that have the bronze bushing where the barrel stub screws into the action but do not understand what other bushing? you are speaking of.

Thanks
 
BAT DS - Bolt face bush

brcman said:
Michael Huebner- I am not understanding you comment about early BAT DS actions, I have 3 BAT DS actions that have the bronze bushing where the barrel stub screws into the action but do not understand what other bushing? you are speaking of.

Thanks
Click to expand...

The early BAT DS actions have a removable bush in the bolt face.
If for whatever reason the bolt face or the firing pin hole becomes damaged or you wanted to change the size of you firing pin and need a smaller hole, the existing bush can be pressed out and a new one made with hardened 4140 around 40RC and pressed back in.

You can check if your bolts have this feature; remove the firing pin assembly and shine a torch or use a bore scope and you will see a dark ring around 1/4” in size. It can be pressed out with a 0.1875 punch

I do have photos of mine, showing the dark ring inside the bolt.

I hope that clears it up for you

Michael
 
Michael Huebner said:
I don’t believe there is any heating involved.
The original BAT DS actions had a removable piece. Not sure when this changed but I suspect when the bronze bush was also removed from the production units.

Never seen one move in an early BAT DS action

Michael
Click to expand...

It makes for a far more permanent press fit.
It was one of the 'secrets' of making large naval gun barrels for many many years.
 
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