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Revolver cylinder question

This is a discussion on Revolver cylinder question within the Gunsmithing forums, part of the Firearm Forum category; When measuring barrel cylinder gap how consistent should the measurements be? In other words how much should the measurements vary from chamber to chamber, .001", ...


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Old February 5th, 2015, 12:05 PM   #1
 
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Revolver cylinder question

When measuring barrel cylinder gap how consistent should the measurements be? In other words how much should the measurements vary from chamber to chamber, .001", .002" or is that too much? Just curious for my own knowledge.



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Old February 5th, 2015, 03:34 PM   #2
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Quote:
Originally Posted by pica60 View Post
how much should the measurements vary from chamber to chamber, .001", .002" or is that too much? Just curious for my own knowledge.
None. But the measurement process might present an apparent difference. Barrel rear extensions are often roughly hacked off with a cutoff tool. Cylinders are drilled/reamed out from front to back, and a slight burr is left standing proud of the cylinder face. Also be aware that the barrel extension may not be cut square to the cylinder face, which will give you a different reading when measuring from each side. Or, the owner might scrub the cylinder face with an abrasive to remove all traces of firing residue. That would have a cumulative effect on b/c gap.

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Old February 6th, 2015, 02:06 PM   #3
 
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Factory revolvers generally aren't true enough that you get the same B/C gap from chamber to chamber. You'll often even find that the barrel tennon isn't perfectly square to the face, so you might find 0.001" more or less from the top of the barrel to the bottom for the same chamber, or vice versa.

The trueness of the cylinder pin, cylinder pin ports at either end, mainpin bore in the cylinder, indexing ratchet and recoil shield machining, barrel tennon, and cylinder face all factor into how true a revolver ends up. You won't usually find that the gap goes up and down from one to the next around the horn, but usually a trend, meaning the cylinder face is out of square, or the mainpin to bore alignment, or the indexing ratchet height is out of whack.
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Old February 6th, 2015, 08:21 PM   #4
 
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I typically find that after cleaning the burrs off of both the end of the barrel and the throat end of the cylinders that they are all within plus/minus .001"
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