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Old July 21, 2015, 06:57 PM   #1
Join Date: June 11, 2006
Location: North Central Florida
Posts: 3,034
arbor wonders

OK responses to Mike's 1860/NMA post have me thinking.

How much difference is there in the diameter of a NMA .44 a ROA .44 and a 1860.44 arbor?

Would some sort of blast shield like on the 1873 cartridge SAA have made a NMA more reliable?

How about the Whitney or the S&B, though .36 did they have more problems than Colt because of arbor design?

Much as I hate two wildly different questions in one post.......

Also curious given the way Ruger has borrowed extensively from KelTec, shoot even SiG borrowed from KelTec, any reason some say Italian firm could not start making new ROAs tomorrow morning? Even to interchangeable parts?

Blue would be fine.....

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Old July 21, 2015, 07:15 PM   #2
Join Date: June 24, 2008
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Too many trips to Starbucks this morning Bob?
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Old July 21, 2015, 10:32 PM   #3
Join Date: June 21, 2005
Location: Portland, OR
Posts: 780
The arbor on my 1860 Pietta Colt measures around 0.425 inches, maybe a skosh more. The Remington NMA (also Pietta) cylinder pin is 0.223 ish. Also the 1860 arbor is spiral grooved under the cylinder rather than smooth, which I believe helps give any fouling somewhere to go and allows for plenty of lube to keep things moving. Sorry, I don't have a ROA to measure for you.
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Old July 22, 2015, 12:18 AM   #4
Join Date: February 6, 2009
Location: Queen Creek, AZ
Posts: 619
I don't think the ROA's arbor pin is much bigger than .25, the same as their centerfire revolvers.

OK, I just looked, and I'll stick by my .25 claim. Couldn't locate my dial caliper, though.
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Old July 22, 2015, 05:49 PM   #5
Join Date: January 26, 2015
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For the ROA it's right now 6.57mm or 0.26" (0.258 exactly) that what said the dial caliper on my knees...

But for tomorrow I don't know......

Last edited by Erwan; July 22, 2015 at 05:56 PM.
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Old July 22, 2015, 06:17 PM   #6
Join Date: February 9, 2015
Location: SC
Posts: 35

Gotta get me one of those talking calipers.

just kidding
don't get your panties in a wad
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Old July 22, 2015, 06:51 PM   #7
Join Date: January 26, 2015
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I'll take care....

Have a nice day...

Last edited by Erwan; July 23, 2015 at 10:31 AM.
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