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Hot Topic (More than 10 Replies) Falling block action build along (Read 869 times)
Bailey Bradshaw
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Falling block action build along
Aug 11th, 2019 at 1:17pm
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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.

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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.

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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. 

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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.

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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.

« Last Edit: Aug 11th, 2019 at 2:00pm by Bailey Bradshaw »  
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Bailey Bradshaw
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Re: Falling block action build along
Reply #1 - Aug 11th, 2019 at 1:25pm
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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.

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« Last Edit: Aug 11th, 2019 at 2:03pm by Bailey Bradshaw »  
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Bailey Bradshaw
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Re: Falling block action build along
Reply #2 - Aug 11th, 2019 at 1:48pm
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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.

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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.

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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.

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« Last Edit: Aug 11th, 2019 at 2:05pm by Bailey Bradshaw »  
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Bailey Bradshaw
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Re: Falling block action build along
Reply #3 - Aug 11th, 2019 at 1:54pm
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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.

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The finished barrel shank hole and threads

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« Last Edit: Aug 11th, 2019 at 2:07pm by Bailey Bradshaw »  
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Just Jim
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Re: Falling block action build along
Reply #4 - Aug 11th, 2019 at 2:00pm
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Wow! Very, very interesting to see! Thanks for taking the time to share your excellent work.  Smiley
  
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Amoretti
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Re: Falling block action build along
Reply #5 - Aug 11th, 2019 at 2:43pm
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Outstanding work!  I envy your skill both as a machinist but also as a designer.

I hope you will continue to post as the project progresses.

One of the best threads yet!

John
  
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marlinguy
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Ballards may be weaker,
but they sure are neater!

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Re: Falling block action build along
Reply #6 - Aug 12th, 2019 at 10:30am
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Thanks for the post! I love seeing the steps you take, even though it's all above my skill level!
  

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stevelins
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Re: Falling block action build along
Reply #7 - Aug 12th, 2019 at 12:57pm
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One of those looks like mine!
  
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Bailey Bradshaw
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Re: Falling block action build along
Reply #8 - Aug 12th, 2019 at 2:21pm
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Indeed Steve. One has your name on it.
  
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JLouis
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Re: Falling block action build along
Reply #9 - Aug 12th, 2019 at 3:03pm
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Thank you very much for taking the time to share your talents and it is indeed very nice work. I might have missed it along the way and would like know what you are selling these actions for and when will they be ready to be shipped.
  
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Bailey Bradshaw
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Re: Falling block action build along
Reply #10 - Aug 12th, 2019 at 9:14pm
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JLouis,

Thanks.

Here is a link to my website with the info you requested. I will have these actions complete and ready to barrel ( or ship) next week. One still needs an owner, the other four are spoken for.

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beltfed
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Re: Falling block action build along
Reply #11 - Aug 14th, 2019 at 10:16pm
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Bailey,
Next question:
Can the side lever be had on the left side of the action?
Somehow?
A left hander
beltfed/arnie
  
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Bailey Bradshaw
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Re: Falling block action build along
Reply #12 - Aug 14th, 2019 at 11:08pm
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Beltfed,

Absolutely. Already planned for and easily executed.
  
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Schuetzenmiester
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Re: Falling block action build along
Reply #13 - Aug 15th, 2019 at 12:08am
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How about a rimfire model?
  

"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence
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Bailey Bradshaw
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Re: Falling block action build along
Reply #14 - Aug 15th, 2019 at 9:42am
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Schuetzenmiester wrote on Aug 15th, 2019 at 12:08am:
How about a rimfire model?


Of course.
  
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