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PostPosted: Thu Mar 02, 2017 5:46 am 
Hawkeye

Joined: Tue Aug 16, 2005 1:01 am
Posts: 17748
Location: Milo Maine
Thanks Lee! Awaiting the next chapter. :D ps

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PostPosted: Mon Mar 06, 2017 7:19 pm 
Hunter
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Joined: Wed Dec 18, 2002 2:01 am
Posts: 4456
Location: Arlington, Virginia
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The space between each ratchet cog must be relieved. I’ll get into why and the specific geometry when I cover pawl modification. But in short, these cuts allow the hand’s second leg to clear the ratchet. If left un-milled, the lower portion can get wedged against the pawl slot.

A standard 3/8” endmill relieves the ratchet. I zeroed it against each plane before feeding in 0.060”. The cutter was moved along the Y-axis as opposed to the X. This is repeated by advancing the indexing head 8 times to locate the next cog.

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"Building carpal tunnel one round at a time"


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PostPosted: Mon Mar 06, 2017 7:25 pm 
Hunter
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Joined: Wed Dec 18, 2002 2:01 am
Posts: 4456
Location: Arlington, Virginia
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Total cylinder length must be tightly managed. Cut it too short and you’ll have endshake. If that happens, install a press fit bushing machined a few thousandths long. Then slowly grind or lathe in half-thousandth increments until it fits. Or if you have a surface grinder, dial to ten-thousandths for an exact match. You’re close if the cylinder goes in under force but drags when cycled. A few tenths more and it should freely spin with no shake.

I begin by torqueing a spud into the front of the frame. This counteracts dimensional changes that took place when opening the window. That sounds odd so let me explain. When steel is milled, work hardening occurs. Under these conditions, the frame can contract a thousandth or two. We found this out the hard way on my Buffalo Seville. The heat treated cylinder was dead rigid until the barrel was installed. That actually re-sprung the frame 0.0015”, probably by way of stress relieving. 0.0015” is acceptable endshake for a factory gun, but not on our customs. We bushed the gas ring and ground the face, thus eliminating discernable play.

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The inside of the frame is measured with instrumentation accurate to tenths.

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From the back of the ratchet recess to the gas ring boss equals 1.982”. The blank is 2.203”, meaning I’ll remove 0.221”. A depth stop is set on the lathe table. Facing is done in increments of 0.030” down to 2.000”. I then machined the gas ring 0.440” in diameter and to a height I knew would be too long.

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Side shot of the gas ring cut tall:

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I took extremely light cuts across the boss until it fit the frame. This is tedious and not a step you want to rush. 0.004” was turned off the back of the cylinder to prevent rub on the breech face. When the cylinder goes in smoothly and rotates without drag, I quit. Here’s a shot of it in the frame using a spare basepin. Three things to highlight:

1) If you’re OCD like I am, get used to superficial scuffs. The frame and cylinder go through a lot of machining and test fitting to get to this point. Once the gun is complete, I’ll polish and buff each and every part.

2) A 0.004” feeler gauge barely goes between the rear cylinder and the recoil shield. Top and bottom clearance on the cylinder is 0.008” per side.

3) Barrel protrusion into the frame is 0.030” (minus 0.001” – 0.0015” for cylinder gap). I’m making use of the entire window.

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"Building carpal tunnel one round at a time"


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PostPosted: Wed Mar 22, 2017 9:02 pm 
Single-Sixer

Joined: Sun Aug 30, 2009 10:08 am
Posts: 244
Location: Glendale, Az.
Boy I sure hope this continues, don't stop now.

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PostPosted: Thu Mar 23, 2017 7:17 am 
Hawkeye

Joined: Mon Nov 05, 2007 4:40 pm
Posts: 8063
Location: Dallas, TX
Just incredible, thank you so much.


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PostPosted: Thu Mar 23, 2017 4:54 pm 
Single-Sixer

Joined: Sun Oct 21, 2012 5:09 pm
Posts: 140
Anxiously awaiting the next update!


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PostPosted: Fri Mar 24, 2017 5:14 pm 
Hunter
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Joined: Wed Dec 18, 2002 2:01 am
Posts: 4456
Location: Arlington, Virginia
I've been sidetracked with a benchrest rifle the past two weeks. But I'll be working on the .500 this Sunday. More to come.

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"Building carpal tunnel one round at a time"


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PostPosted: Tue Mar 28, 2017 9:00 am 
Hunter

Joined: Sat Mar 20, 2010 9:11 pm
Posts: 3263
Location: Ridgefield WA
Cool ! I look for your posts every day.


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PostPosted: Wed Mar 29, 2017 10:28 pm 
Hunter

Joined: Tue Sep 17, 2013 9:06 pm
Posts: 2357
Location: Southern California
VernTMG wrote:
.....and can you work faster so you can post more haha......

I've got the tools but not that skill level. I'm thinking I'd have to at least triple the time then add some more for when I scraped a part and had to start over. I did an AR from a raw forging that took me just over 10 hours. I can do 80% ones in a little over an hour.

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PostPosted: Mon Apr 24, 2017 6:28 pm 
Hunter
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Joined: Wed Dec 18, 2002 2:01 am
Posts: 4456
Location: Arlington, Virginia
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We’ve now come to the most intricate part of the conversion – timing the gun. First, I reinstalled the guts to include the heavier gate spring by Power Custom.

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Because the frame window was milled, the bolt height has to be shortened. With the gate open, the excess is marked with a scribe.

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The bolt is secured in a vise and the height is reduced from 0.280” to 0.250”.

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The re-contoured bolt:

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With 72 degree rotation between chambers, the bolt also has to drop faster. To accomplish this, the hammer plunger recess is filed back about 0.030”. This allows it to protrude more from the hammer and the bolt is engaged sooner.

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5-shots require reworking the pawl. I wish I could say there are standard dimensions here. You really have to alter them slowly, reinstall to test function, and remove metal to achieve correct timing. On a typical 5-shot build, we may test fit the pawl ten times to get it perfect.

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Here are the main tenants of the modification:

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The finished pawl:

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PostPosted: Mon Apr 24, 2017 8:36 pm 
Single-Sixer

Joined: Sun Oct 21, 2012 5:09 pm
Posts: 140
Thank you for the update! I recently ran across a set Youtube videos Ruger put out on how they go about making different guns. That got me thinking about your post, and I was going to find it and see if there was an update. Looking forward to your next installment.


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PostPosted: Mon Apr 24, 2017 8:36 pm 
Single-Sixer

Joined: Sun Oct 21, 2012 5:09 pm
Posts: 140
Thank you for the update! I recently ran across a set Youtube videos Ruger put out on how they go about making different guns. That got me thinking about your post, and I was going to find it and see if there was an update. Looking forward to your next installment.


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PostPosted: Thu May 18, 2017 9:56 pm 
Single-Sixer

Joined: Sun Aug 30, 2009 10:08 am
Posts: 244
Location: Glendale, Az.
TTT Would like to see how the progress is going.

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PostPosted: Sat May 20, 2017 6:43 am 
Single-Sixer

Joined: Sat Oct 05, 2013 4:03 pm
Posts: 132
Location: mountains of PA
Awesome step by step here. Shows how involved these processes truly are. This really is an art!!


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PostPosted: Sun May 21, 2017 8:55 am 
Newly Registered

Joined: Sun May 21, 2017 7:30 am
Posts: 17
Damn!!!!! Mad skills.


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