Discussion in 'Blackpowder' started by W/Vickers1938, Jul 6, 2022.
Thanks in advance
@Jackrabbit1957 and @45 Dragoon
The arbor is the " backbone" of the open top revolver. It is the connecting piece for the barrel assembly and the wedge is employed to hold the two together. The cylinder is also supported by the arbor. In order for the cylinder to rotate, it can't be locked down by the barrel being pulled back against it. Therefore, the barrel assy is pulled back (under great tension by the wedge since the wedge is to be driven in) against the end of the arbor . . . which is why THAT is what defines the barrel/ cylinder clearance ( or endshake).
The original Colt revolvers were built accordingly but all the reproductions, since the originals, have been built with short arbors ( save for the Piettas of the last dozen or so yrs.).
The destruction part comes from the ability for the cylinder to act like a "slide hammer" and slam against the recoil ring (arresting surface for the cyl). This tends to destroy the wedge which increases the barrel/cylinder "endshake " which only gets worse, not better. The time-line for this type of thing depends totally on the "tolerance stack" of the particular revolver, powder charge used, bullet weight and usage.
A close endshake of .0025" - .003" seems to be enough to negate any problems.
I thought this problem plagues Ubertis rather than Piettas.
But it's easily fixed by putting the requisite thickness of washers on the end of the arbor (either temporarily or permanently).
Yes, thanks for reminding me about the "current production" Piettas. ( I edited my post accordingly).
I just JB weld the washer in the arbor hole. Never had one come out.
Soldering a shim to the end of the arbor should be permanent and cost effective. It could be dressed up to match the arbor and be unnoticeable.
THAT is how important the arbor length is.
I tried to incorporate a ring to be captured in a groove ( like a snap ring) to "contain" the single spacer but it was more headache than worth and didn't work so well, so I just stuck with JB. It's cheap, fast, and it's a tuff job drilling out a ss spacer held in with it!!! Lol
do you have a website ?
Dang if I didn't see a pic with my work-in-progress 1860 in it. !!! Or one just like it with a piece of brazing rod for a front sight. Anyhow, Jack, if you need/want another testimonial let me know.
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