Jump to content


Photo

Extraction


  • Please log in to reply
16 replies to this topic

#1 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 21 December 2011 - 01:42 AM

I switched to the barrel ring without the groove. But consider the grooved ring. If the groove were repositioned a belleville type spirng could be inserted into the groove. This spring would then assist the extractor and pop the spent shell out of the chamber.

#2 Roller

Roller

    Advanced Member

  • Members
  • PipPipPip
  • 126 posts

Posted 21 December 2011 - 01:52 AM

Interesting thought.

Frank

#3 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 03 January 2012 - 07:23 AM

Here is a drawing of the idea of using a belleville spring to assist in the ejection. The barrel ring is milled to accept the spring. It is held in place by the pan. The spring is shaped to meet with the bolt extractor, not shown on the drawing. This could be used with the bolt ejector, the finger ejector or with a modified bolt with no ejector. I have not yet tested this idea.
 

 

Attached File  ejector spring-id=620.png   84.75KB   2 downloads



#4 Roller

Roller

    Advanced Member

  • Members
  • PipPipPip
  • 126 posts

Posted 09 January 2012 - 12:25 AM

Steve,

I don't understand your idea. Explain further please. If the bellville washer is part of the chamber wouldn't it increase cranking pressure?

Frank

#5 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 09 January 2012 - 03:15 AM

Another view

Attached File  ejector spring 2-id=631.png   103.09KB   0 downloads



#6 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 09 January 2012 - 03:30 AM

Roller,
The spring is only bent enough to assist the ejection, .010 - .030? It should only add a minimum amount of pressure to the cranking. I do not think it will be felt. The idea is to pop the shell out of the chamber as the ejector starts the return movement. The spring is of minimum thickness, .015 - .030 ? I have not tested this. I am trying to locate spring steel shim material. I did not know it was so expensive.
Google search says the impact devices for packages are called acelorometers. They are inexpensive but the equipment they attach to is not.
A digital force meter that will do just what I want is $400 and much more. Still looking.

#7 Roller

Roller

    Advanced Member

  • Members
  • PipPipPip
  • 126 posts

Posted 11 January 2012 - 01:52 PM

Ran 50 rounds through the gun yesterday with 100% extraction and only 4 missfires. The missfires aren't so bad as long as the round ejects. I loaded the magazine (25 rds) twice and was able to crank the gun till the mag was empty. I have reduced my firing pin to a .025 x .043 rectangle that impacts right on the rim. I believe the missfires are due to the ammo, rimfire isn't the most reliable ignition in my opinion. Anyway, the gun is coming apart now for polishing and finishing. I have shot 350 rounds so far. Anybody need any yellow pages with holes in them?

Frank

#8 Roller

Roller

    Advanced Member

  • Members
  • PipPipPip
  • 126 posts

Posted 11 January 2012 - 02:23 PM

Roller,
The spring is only bent enough to assist the ejection, .010 - .030? It should only add a minimum amount of pressure to the cranking. I do not think it will be felt. The idea is to pop the shell out of the chamber as the ejector starts the return movement. The spring is of minimum thickness, .015 - .030 ? I have not tested this. I am trying to locate spring steel shim material. I did not know it was so expensive.
Google search says the impact devices for packages are called acelorometers. They are inexpensive but the equipment they attach to is not.
A digital force meter that will do just what I want is $400 and much more. Still looking.

I see what you mean now. If you could get the shell case to pop out for more than half its length it might work without the extractor. I have some spring stock so I will do an experiment.

Frank

#9 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 11 January 2012 - 03:50 PM

Roller,
Excellent. Since I started my ggun you are the only one that has posted such success. I knew it could be done. Thanks for joining this group and your contributions.

#10 Dave

Dave

    Site Admin

  • Administrators
  • 762 posts
  • LocationIllinois

Posted 12 January 2012 - 12:50 AM

What ever happened to your idea on using this extractor?

It looks very functional for a rgg bolt...

 

Attached File  402940-id=642.jpg   34.46KB   0 downloads



#11 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 12 January 2012 - 04:22 AM

With Roller's success it would seem my ideas would interest only myself.
As Sparky suggested I made separate topics. The RG finger extractor that Sparky and the Nightman suggested and the flat extractor that the Watchman mentioned. I have not made a drawing using the clip on style that Sparky posted yet. This looks good because the clip does not have to be fabricated but I do not know it's dimensions.
I am going to pursue my ideas to the point of making and testing a prototype just the satisfy my curiosity. Maybe someone else might do it before me?

#12 Sparky_NY

Sparky_NY

    Advanced Member

  • Members
  • PipPipPip
  • 260 posts
  • LocationAnderson, SC

Posted 12 January 2012 - 11:15 AM

What ever happened to your idea on using this extractor?

It looks very functional for a rgg bolt...



I bought that one just to have a look at at. Of course its to large for a DE gun, the marlin bolt that it clips around is about a half inch and we only have .275 I believe. They would have to be made up. 1095 spring stock annealed would be the right material, then heat and quench.

#13 Roller

Roller

    Advanced Member

  • Members
  • PipPipPip
  • 126 posts

Posted 19 January 2012 - 12:33 AM

Now that my gun is apart I took a photo of what I did to preserve my extractors. The cad drawing provided by Paul Mercer was my inspiration.

Frank

 

Attached File  IMG_0513 (Large)-id=661.JPG   68.87KB   0 downloads



#14 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 19 January 2012 - 03:51 PM

Roller,
While I was discussing the barrel ring with 'pmercer' I made several experiments with the ring. I made several more rings, grooved and non grooved. I did this mostly to find better ways to machine the assembly. One of the things I tried was to make a steel ring insert to fit into the groove to try to keep the shells from blowing out. I went through my acid covered rubbish pile that is my ggun to see If I still had the parts. I could only find one of the inserts. I am sure I recycled all the brass barrel rings I made. I found one steel ring that has keys cut in it. Cutting the key after boring the holes caused alignment problems. I am very good at machining mistakes and ideas that do not work.
I like your added ring. Nice, neat, crisp.

 

Attached Files



#15 Pmercer

Pmercer

    Advanced Member

  • Members
  • PipPipPip
  • 121 posts

Posted 21 January 2012 - 01:01 PM

That ring looks great. It's a really simple addition but the benefits are that it stops the barrels coming out and can be fine tuned to add support to the extractors (original type)

I like that very much.

#16 Steve McKuhen

Steve McKuhen

    Advanced Member

  • Members
  • PipPipPip
  • 189 posts

Posted 21 January 2012 - 06:15 PM

Mr. P,
If you recall we were discussing the little sliver left behind by machining the grooved ring. I was using the added ring to fit in the groove to find a machining answer to mounting the barrel assemble on the lathe or the mill. I was headed in the wrong direction.
Roller's idea is an elegant answer to add support to the extractor.

#17 Pmercer

Pmercer

    Advanced Member

  • Members
  • PipPipPip
  • 121 posts

Posted 21 January 2012 - 11:36 PM

Steve, I do recall the conversation. Roller has done well here. Into ice the bolt has the additional support on it as well. A win win situation if keeping the original bolts.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users