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Post Posted: Fri Nov 09, 2012 12:17 am 
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Don't use the roll pin...simple.
Joe

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Joined: Thu Oct 25, 2012 11:31 pm
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Post Posted: Fri Nov 09, 2012 3:00 am 
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Jolly Rogers wrote:
Don't use the roll pin...simple.
Joe


That would solve the issue of the roll pin getting bound up. So maybe just a 1/16" dowel pin as suggested by Don?

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Post Posted: Fri Nov 09, 2012 11:57 am 
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That would be my course of action. I know the engineering benefits of roll pins as I fight them at my job daily, but they add a "cheap expedient"feel to things that should feel nice. If you know what I mean...
Joe

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Post Posted: Fri Nov 09, 2012 3:33 pm 
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Jolly Rogers wrote:
That would be my course of action. I know the engineering benefits of roll pins as I fight them at my job daily, but they add a "cheap expedient"feel to things that should feel nice. If you know what I mean...
Joe



Plus roll pins can tolerate a larger hole size variance. A small dowel pin hole is typically held to .0005 total tolerance whereas roll pins can tolerate the hole .001-.002 oversized. This is probably why they (roll pins) are used with production guns......

Rgsd
Eric


Last edited by egumpher on Fri Nov 09, 2012 7:47 pm, edited 1 time in total.
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Post Posted: Fri Nov 09, 2012 4:56 pm 
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That's exactly why I was thinking about trying the coil spring pins - stronger than a roll pin but still a snug fit in the frame hole.

StrikerDown - I'm not an engineer. Is that difference in strength significant? It doesn't sound like a big difference to me.

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Post Posted: Fri Nov 09, 2012 5:20 pm 
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Quote:
Is that difference in strength significant? It doesn't sound like a big difference to me.


Dave, I wouldn't think so in this case. The pin is just there I'd think basically to keep the ejector from falling out (remember, this was a design for the military where lost parts in the field can be a disaster). All the load on the ejector should be on the two legs and more less straight to the rear.

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Post Posted: Fri Nov 09, 2012 6:06 pm 
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To elaborate on Strikerdown's post:

1/16" dowel pin strengths from Machinery's Handbook:

1/16" AISI B18.8.2 hardened steel dowel pin double shear: 800 lbf
1/16" AISI B18.8.2 hardened steel spring pin double shear: 425 lbf
1/16" AISI B18.8.2 hardened steel roll pin double shear: 300 standard duty and 450 lbf heavy duty. (250 lbf mentioned before is the strength of AISI 302 stainless)

The dowel pins are certainly stronger but can be hard to fit. If the ejector is properly fit, as mentioned before, the pin isn't under any load. If the extractor is loose then the pin will see a load.

FWIW, my buddies Citadel 1911 had a loose ejector a few years back and the hole was wallowed out as a result. I put in a 1/16 roll pin because that's all I had to fix it and he hasn't had any problems since then.

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Eric

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Post Posted: Fri Nov 09, 2012 7:19 pm 
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I think like Don said, it should keep it from falling out. I have built several that have no pin period. Tight fit and loctite.

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Post Posted: Fri Nov 09, 2012 10:55 pm 
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Where else will you get a discussion like this? So refreshing to get good advice detailed information and no name calling...
Joe

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Post Posted: Fri Nov 09, 2012 11:33 pm 
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Jolly Rogers wrote:
Where else will you get a discussion like this? So refreshing to get good advice detailed information and no name calling...
Joe

Well....that could be because I hadn't posted yet! :P

LOG

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