Choice for Conversion or OT

Started by gunboat57, January 04, 2012, 03:14:31 PM

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gunboat57

Just as a followup to my post #18 above, Mako kindly forwarded to me some cylinder dimensions taken from original 1872 OTs and 1860 Army revolvers.  It seems when Colt made the 1872 cylinders they did choose an outside diameter in between the rebated and non rebated diameters of the 1860 cylinder.

That tells me that the rotational cut in the OT frame concentric to the arbor just had to be made about .030 deeper (on the radius) to provide clearance for the OT cylinder.

If the arbor axis to bore axis dimension didn't change (and why would it for 44 rimfire?) then the basic overall dimensions of the 1851/1860 frame could've been retained for the OTs.

So it seems like, as Hoof Hearted pointed out, the 1851/1860 frame is different from an OT frame, but I'd say from a manufacturing process point of view, the different frames probably had a common initial casting or forging, and initial machining operations.
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