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Double Rifles, Single Shots & Combinations >> Single Shots & Combination Guns

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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Falling block action build along
      #331048 - 12/08/19 03:58 AM

Building the first run of sidelever falling block actions, I've documented the process so far.

The first step obviously is to extract the action from the plate of 8620 steel in which it is contained. I am fortunate to have a wire EDM in house. While it is capable of far greater accuracy than is required for simply profiling the action, precision is never wasted.





Once the batch of action bodies are all profiled, holes are drilled to located the starting point for the wire path to cut the breech block cavity, and a fixture is made to hole the actions during the cut.



Breech blocks were wire cut before I started on the actions. The fit is extremely precise with .001" clearance for movement. Wire EDM is a very slow process and it's done under a powerful flush of water to cool the wire and clear eroded metal from the cut.†



The tang surfaces are machined with tapers in both horizontal and vertical axis. There are also flats left on the interior edges of the tangs to index onto the inletting of the stock to negate any movement of the action once it's seated. Actions are secured to the stock with a drawbolt.

From there the pockets for the trigger group, cocking lever and extractor are machined. Also the hole in the side of the action for the sidelever stem.



Actions are flipped over and the cartridge trough is machined in. A mock assembly of the sidelever, breech block and trigger group housing ( also made before the action bodies were started) is hard to resist.

--------------------
www.bradshawgunandrifle.com


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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: baileybradshaw]
      #331050 - 12/08/19 04:02 AM







The trigger group is removeable and tuneable for pull weight and sear engagement. The rim of a cartridge can be used to push back the locking plunger at the rear of the trigger group pocket in the bottom tang.



--------------------
www.bradshawgunandrifle.com


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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: baileybradshaw]
      #331051 - 12/08/19 04:05 AM

Set in another fixture dedicated to the machining of the face of the action and associated steps. A 2" deep hole is drilled at the center of the hole for the barrel. This establishes the center of the bore and the center of the pocket for the striker and that the two are perfectly aligned.



The face of the action is trued to ensure it is perfectly perpendicular to the bore. This is where the barrel seats and is a very important step to ensure accuracy. Not unlike facing the end of a bolt rifle action.



Now the hole for the barrel can be machined. The breech block is in the action during this setup, so the bottom of the barrel hole will form the face for the breech block in a very precise manner. Not only will it be perpendicular, it is also machined to a known depth allowing the machining of the barrel shank to be done to the exact length. The breech block is tilted forward 3 degrees, so accurately cutting the breech block face any other way would be far more time consuming and wouldn't yield the precision this setup offers.

Also, the picture below shows the location of the center of the bore is well below the top edge of the breech block pocket. This allows the full diameter of the chamber, and case thrust for firing, are fully supported in the action. Even though the breech block extends to the bottom of the action, this helps prevent the case thrust from torquing the breech block and further localizing the area of the action that would absorb the case thrust. Having the camber area fully supported keeps the distribution of the case thrust over a much more broad area.



--------------------
www.bradshawgunandrifle.com


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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: baileybradshaw]
      #331052 - 12/08/19 04:07 AM

With the barrel hole machined, the threads can be machined with a thread mill. Precision threads cut in perfect alignment with the hole, the action face and breech block face.



The finished barrel shank hole and threads



--------------------
www.bradshawgunandrifle.com


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tinker
.416 member


Reged: 12/03/05
Posts: 3911
Loc: Nevada
Re: Falling block action build along [Re: baileybradshaw]
      #331055 - 12/08/19 05:02 AM

Nice!

--------------------
--Self-Appointed Colonel, DRSS--



"It IS a dangerous game, and so named for a reason, and you can't play from the keyboard. " --Some Old Texan...


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TH44
.375 member


Reged: 21/02/09
Posts: 566
Loc: West UK
Re: Falling block action build along [Re: tinker]
      #331056 - 12/08/19 08:44 AM

Wow! as Tinker says very nice, as well as interesting to me, a considerably less talented metalworker
Many thanks for posting

TH44


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Ash
.400 member


Reged: 10/05/11
Posts: 1512
Loc: QLd, Australia
Re: Falling block action build along [Re: TH44]
      #331062 - 12/08/19 12:41 PM

TH44: May I ask what your job is?


Nice work on the above! Fantastic to watch. Do you sell individual actions?

--------------------
.


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DoubleD
.400 member


Reged: 23/11/03
Posts: 2016
Loc: Retired in Oklahoma
Re: Falling block action build along [Re: Ash]
      #331073 - 13/08/19 12:27 AM

A thread mill! I have only ever read about that in school 35 years ago. I have never seen it done. Wow.

Interesting shop you have there.

Youtube video on thread milling:
https://www.youtube.com/watch?v=FEy_Uq2Q8eM


Edited by DoubleD (13/08/19 12:30 AM)


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Daryl_S
.577 member


Reged: 10/08/05
Posts: 19555
Loc: Beautiful British Columbia, Ca...
Re: Falling block action build along [Re: DoubleD]
      #331074 - 13/08/19 12:54 AM

Quote:

A thread mill! I have only ever read about that in school 35 years ago. I have never seen it done. Wow.

Interesting shop you have there.

Youtube video on thread milling:
https://www.youtube.com/watch?v=FEy_Uq2Q8eM





Exactly! amazing work, Bailey.

--------------------
Daryl


"a rifle without hammers, is like a Spaniel without ears" Edward VII


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93x64mm
.400 member


Reged: 07/12/11
Posts: 1640
Loc: Nth QLD Australia
Re: Falling block action build along [Re: TH44]
      #331093 - 13/08/19 06:25 AM

Quote:

Wow! as Tinker says very nice, as well as interesting to me, a considerably less talented metalworker
Many thanks for posting

TH44




Oh you must be referring most definitely to me then TH44 - bloody hopeless I am!
Truly amazing work Bradley!
Please keep the sessions going a lot of us here really do appreciate work such as this!


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Ash
.400 member


Reged: 10/05/11
Posts: 1512
Loc: QLd, Australia
Re: Falling block action build along [Re: DoubleD]
      #331099 - 13/08/19 08:43 AM

Quote:

A thread mill! I have only ever read about that in school 35 years ago. I have never seen it done. Wow.

Interesting shop you have there.

Youtube video on thread milling:
https://www.youtube.com/watch?v=FEy_Uq2Q8eM





Interesting, thatís a different tool to what I use for thread milling. I use these:

https://i.imgur.com/3NUimXH_d.jpg?maxwidth=640&shape=thumb&fidelity=medium

--------------------
.


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TH44
.375 member


Reged: 21/02/09
Posts: 566
Loc: West UK
Re: Falling block action build along [Re: 93x64mm]
      #331101 - 13/08/19 08:46 AM

Ash - I am semi-retired, brought up in the motor trade and played with lathes etc. for many years (I have a medium size one in my workshop)
Most of my life I have been in the commercial diving industry and still dive and service diving equipment
My standard could be referred to as a MODERATE amateur, but the excellent work here is way beyond me
TH44

Edited by TH44 (13/08/19 08:50 AM)


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Taylor416
.300 member


Reged: 25/11/04
Posts: 161
Loc: Central West, New South Wales....
Re: Falling block action build along [Re: TH44]
      #331112 - 13/08/19 05:27 PM

Very talented, love it!

cheers

--------------------
Love to hunt!


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Louis
.333 member


Reged: 13/05/15
Posts: 363
Loc: France
Re: Falling block action build along [Re: Taylor416]
      #331177 - 15/08/19 02:58 AM

Much impressive and talented work; thank you for posting!
Please keep us updated on the next steps.
Louis

--------------------
"Everything that doesn't kill me makes me stronger"


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lancaster
.450 member


Reged: 06/05/08
Posts: 5593
Loc: There's a lighthouse in the mi...
Re: Falling block action build along [Re: Louis]
      #331196 - 15/08/19 01:59 PM

allways wonder why such actions not available in all sizes from 22 lr to 4 ga

--------------------
Norwegian hunter misses moose, shoots man on toilet
.
bringing civilisation to the barbarians


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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: lancaster]
      #331212 - 15/08/19 11:59 PM

Quote:

allways wonder why such actions not available in all sizes from 22 lr to 4 ga




.22 lr is no problem. The action can be slimmed down with minimal change to the internal mechanism. Scaling up to 4 bore size is a different story. It can be deceptively challenging.

--------------------
www.bradshawgunandrifle.com


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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: baileybradshaw]
      #331231 - 16/08/19 09:47 AM

trigger group housings. First profiled out of 1/2" plate, holes spotted for the pivot points of the trigger and sear, and a window that displays the trigger/ sear engagement.




The housings are then surface ground to final thickness, slotted to accept internal parts, holes drilled and reamed, and the parts are deburred.

.

--------------------
www.bradshawgunandrifle.com


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tinker
.416 member


Reged: 12/03/05
Posts: 3911
Loc: Nevada
Re: Falling block action build along [Re: baileybradshaw]
      #331232 - 16/08/19 11:26 AM

Looking good!

--------------------
--Self-Appointed Colonel, DRSS--



"It IS a dangerous game, and so named for a reason, and you can't play from the keyboard. " --Some Old Texan...


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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: tinker]
      #331342 - 18/08/19 09:20 AM

Triggered.....

Triggers and sears installed in the housings. Next will be to install springs, adjustment and set screws. The triggers are adjustable for pull and seat engagement. The larger house in the housing is for viewing the sear/trigger engagement.

Also, the pivot point for the trigger is towards the rear. This reduces the amount of travel at the blade of the trigger, but amplifies the travel at the front. This reduces felt creep. The forces acting on the trigger from the mainspring to the sear are perpendicular to the pivot point of the trigger. Again, to reduce drag, creep and helps make the trigger more crisp





--------------------
www.bradshawgunandrifle.com


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Homer
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Reged: 07/04/09
Posts: 2564
Loc: Canberra, Australia
Re: Falling block action build along [Re: baileybradshaw]
      #331409 - 19/08/19 06:37 PM

G'Day Fella's,

Thanks for sharing Bailey Bradshaw.

Mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmost impressive and Donut's!

D'oh!
Homer

--------------------
"Beware the Lolly Pop of Mediocrity,
Lick it Once and You Will Suck Forever"


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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: Homer]
      #331490 - 21/08/19 11:43 AM

Organization always helps productivity especially when working on several at a time. Just a few components left to make and assembling then begins





--------------------
www.bradshawgunandrifle.com


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Homer
.416 member


Reged: 07/04/09
Posts: 2564
Loc: Canberra, Australia
Re: Falling block action build along [Re: baileybradshaw]
      #331492 - 21/08/19 06:23 PM

Mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmore Donuts!

D'oh!
Homer

--------------------
"Beware the Lolly Pop of Mediocrity,
Lick it Once and You Will Suck Forever"


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Daryl_S
.577 member


Reged: 10/08/05
Posts: 19555
Loc: Beautiful British Columbia, Ca...
Re: Falling block action build along [Re: Homer]
      #331515 - 21/08/19 11:40 PM

I agree - WOW

--------------------
Daryl


"a rifle without hammers, is like a Spaniel without ears" Edward VII


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93x64mm
.400 member


Reged: 07/12/11
Posts: 1640
Loc: Nth QLD Australia
Re: Falling block action build along [Re: Daryl_S]
      #331532 - 22/08/19 06:14 AM

Getting there Bailey!

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baileybradshaw
.333 member


Reged: 21/06/08
Posts: 290
Loc: Diana, TX
Re: Falling block action build along [Re: 93x64mm]
      #331597 - 23/08/19 02:11 PM

Shot of few videos filing up one of the sidelevers. This just gets the lever to shape and ready to start polishing.

https://youtu.be/MA8YVJESIqE

https://youtu.be/wJ1drdP_5Kc

https://youtu.be/WgkgPIrKei8

https://youtu.be/h0hvQlxwR0E

https://youtu.be/t9VYpmslZc0

--------------------
www.bradshawgunandrifle.com


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