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Feb 12th, 2024
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 Revolver Cylinder Gap
#7313122
10/13/18 04:02 PM
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Joined: Aug 2006
Posts: 925
BigDad
OP
Tracker
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OP
Tracker
Joined: Aug 2006
Posts: 925 |
My S&W 625 Mountain Gun (45 Colt) has what I believe is an excessive cylinder gap of .016". I've done a little reading on this and it seems that optimum gap is .004"-.008". My 44 Mag Ruger Super Black's gap is between .002" and .003".
I think the barrel needs to be turned back. Can anyone recommend a good revolver gunsmith that can do this?
Joe
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7313173
10/13/18 05:23 PM
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Joined: Dec 2008
Posts: 41,173
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,173 |
I can TIG weld that up for you.
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7313315
10/13/18 08:03 PM
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Joined: Aug 2006
Posts: 925
BigDad
OP
Tracker
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OP
Tracker
Joined: Aug 2006
Posts: 925 |
Hows that work, you build up the forcing cone with weld then cut it down?
Joe
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7313317
10/13/18 08:05 PM
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Joined: Feb 2009
Posts: 3,705
toolman
Extreme Tracker
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Extreme Tracker
Joined: Feb 2009
Posts: 3,705 |
There are a couple of different schools of thought on that, but I've been doing revolver work for around 40 years and I always suggest starting with endshake bearings before resorting to removing the barrel.
Old age ain't for sissies!
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7313368
10/13/18 08:55 PM
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Joined: Dec 2008
Posts: 41,173
J.G.
THF Celebrity
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THF Celebrity
Joined: Dec 2008
Posts: 41,173 |
Hows that work, you build up the forcing cone with weld then cut it down? It was tongue and cheek.
800 Yard Steel Range Precision Rifle Instruction Memberships and Classes Available
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Re: Revolver Cylinder Gap
[Re: J.G.]
#7313439
10/13/18 10:08 PM
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Joined: Aug 2006
Posts: 925
BigDad
OP
Tracker
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OP
Tracker
Joined: Aug 2006
Posts: 925 |
Hows that work, you build up the forcing cone with weld then cut it down? It was tongue and cheek. You got me 
Joe
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Re: Revolver Cylinder Gap
[Re: toolman]
#7313485
10/13/18 10:58 PM
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Joined: Nov 2005
Posts: 32,601
sig226fan (Rguns.com)
duck & cover
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duck & cover
Joined: Nov 2005
Posts: 32,601 |
True.... and .06 to .10 isn't crazy too much if it's very consistent on all cylinders
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7313487
10/13/18 10:59 PM
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Joined: Nov 2005
Posts: 32,601
sig226fan (Rguns.com)
duck & cover
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duck & cover
Joined: Nov 2005
Posts: 32,601 |
I am sure you have checked, but is the op rod good and snug?
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7313670
10/14/18 02:23 AM
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Joined: Sep 2006
Posts: 32,506
kmon11
junior
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junior
Joined: Sep 2006
Posts: 32,506 |
OP rod is one thing to check and It would not be the first S&W mountain gun I have heard of with a stretched frame, doubtful but possible
lf the saying "Liar, Liar your pants on fire" were true
Mainstream news might be fun to watch
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Re: Revolver Cylinder Gap
[Re: toolman]
#7314465
10/15/18 12:56 AM
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Joined: Aug 2006
Posts: 925
BigDad
OP
Tracker
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OP
Tracker
Joined: Aug 2006
Posts: 925 |
There are a couple of different schools of thought on that, but I've been doing revolver work for around 40 years and I always suggest starting with endshake bearings before resorting to removing the barrel. The cylinder has almost no end-shake.
Joe
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Re: Revolver Cylinder Gap
[Re: sig226fan (Rguns.com)]
#7314466
10/15/18 12:57 AM
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Joined: Aug 2006
Posts: 925
BigDad
OP
Tracker
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OP
Tracker
Joined: Aug 2006
Posts: 925 |
I am sure you have checked, but is the op rod good and snug? OP rod is tight.
Joe
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7314478
10/15/18 01:07 AM
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Joined: Feb 2009
Posts: 3,705
toolman
Extreme Tracker
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Extreme Tracker
Joined: Feb 2009
Posts: 3,705 |
sounds like it might be a good candidate for setting the barrel back then. I can do it, but I'm probably several months out on new work orders. If yu find someone that will do it, be dang sure they have the right tools to prevent tweaking the frame.
Old age ain't for sissies!
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7314489
10/15/18 01:13 AM
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Joined: Feb 2015
Posts: 5,585
hetman
"Trash Master"
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"Trash Master"
Joined: Feb 2015
Posts: 5,585 |
Barrel-to-cylinder gap: The ideal B/C gap is .006”. A close gap will cause the cylinder to drag when fouled from shooting residue. A wide gap will loose muzzle velocity and may spit particles. The normal usable range is from .004~.010”
Hold the cylinder to the rear and insert the thickest gap gauge that will fit between the cylinder face and the rear of the barrel (with friction). This will be the B/C gap.
Cylinder endshake: This test will measure the front to back free travel of the cylinder. It is a good indicator of wear from shooting. Anything over .002” is considered excessive.
Hold the cylinder forward and insert the thickest gap gauge that will fit between the cylinder face and the rear of the barrel with minimal friction. Subtract the measurement from the B/C gap. This will be the cylinder endshake.
![[Linked Image]](http://dc395.4shared.com/img/x5jBfS3Wce/14bb205e9f8/hetsig.gif) "Lesser mortals are pitied for the misfortune in not being born Texan."
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Re: Revolver Cylinder Gap
[Re: BigDad]
#7315644
10/16/18 01:38 AM
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Joined: Aug 2006
Posts: 925
BigDad
OP
Tracker
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OP
Tracker
Joined: Aug 2006
Posts: 925 |
Hetman, I measured the end shake as suggested, with the cylinder pulled to the rear a .016 gauge fits snugly. With the cylinder pushed forward a .015 gauge is tight. The end shake is just under .001".
Joe
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