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  #1  
Old 05-26-2012, 11:26 PM
birdus birdus is offline
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What gage pin sizes for 1911 work?




What gage pins should I get for gun smith work on the 1911?
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  #2  
Old 05-27-2012, 01:11 AM
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custom2 custom2 is offline
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A set that goes from .060 to .250. You won't have much cause to go below .060 but buying that set too couldn't hurt either. I got my set from Amazon.com for around 50 dollars.
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Old 05-27-2012, 03:32 AM
Alland Alland is offline
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Enco also has good deals on tools.
http://www.use-enco.com/CGI/INSRHM
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Old 05-27-2012, 11:56 AM
birdus birdus is offline
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Excellent. Thanks for the advice.

Jay
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  #5  
Old 05-27-2012, 01:19 PM
birdus birdus is offline
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Do I want the plus tolerance set or the minus tolerance set?
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Old 05-27-2012, 01:34 PM
egumpher egumpher is offline
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I choose the plus set because if I measured a hole to be .062+.0002 then I knew a .062 pistol pin would fit the hole.......If i measured the same hole to be .062-.0002 then the hole may be under .062 and the pin might not fit...others may choose differently..

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Eric
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Old 05-27-2012, 01:43 PM
birdus birdus is offline
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Thanks, Eric.
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Old 05-27-2012, 09:48 PM
Alland Alland is offline
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I'll be the different one. I have the minus sets.
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  #9  
Old 05-28-2012, 08:16 AM
egumpher egumpher is offline
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Quote:
Originally Posted by Alland View Post
I'll be the different one. I have the minus sets.
If you don't mind me asking, why did you choose the minus set?

Some think of pin gauges as GO-NOGO gauges with the minus pin acting like a GO gauge and the plus pin a NO-GO gauge. None of the holes on a 1911 frame are held to .0002 so this GO-NOGO logic is moot.....plus all the pin sizes shown on the 1911 government print are held to a diameter minus tolerance (the old way to dimension pins) with a nominal size like the sear pin at .110 -.002.

Rgsd
Eric
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  #10  
Old 05-28-2012, 10:15 AM
57jeeper 57jeeper is offline
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When I was just starting out my old Quality Manager always said to buy "plus " pins, because as they wore they would be closer to the pin size than the "minus " pins. I also like knowing if the pin goes the hole is at least that size.
You have to remember, the pins being referred to are "Z Class " tolerance. That means the tolerance is. 0002". The pin can be anywhere in that range.
If you should need a closer tolerance pin, there are more classes to be found. An economical choice is a Deltronic pin. They are "X plus " grade (.00004"). They go for around $15.00 each and come in. 0001" increments from around. 004" to 1.011".
For gage tolerances search "toolmakers tolerances " here's one.
http://qcssindy.com/index.php?option...nent&Itemid=25
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  #11  
Old 05-28-2012, 10:35 AM
Alland Alland is offline
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Quote:
Originally Posted by egumpher View Post
If you don't mind me asking, why did you choose the minus set?

Some think of pin gauges as GO-NOGO gauges with the minus pin acting like a GO gauge and the plus pin a NO-GO gauge. None of the holes on a 1911 frame are held to .0002 so this GO-NOGO logic is moot.....plus all the pin sizes shown on the 1911 government print are held to a diameter minus tolerance (the old way to dimension pins) with a nominal size like the sear pin at .110 -.002.

Rgsd
Eric
My choice of the minus pins had nothing to do with a 1911. At the time I bought them I needed to check reamed orifice holes. The minus pins better allowed me to monitor reamer wear.

In the 1911 world plus or minus two tenths is meaningless. Other than centering a barrel on the bore for crowning.
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  #12  
Old 05-28-2012, 02:14 PM
egumpher egumpher is offline
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Then I stand behind my original reason for buying +pins...because if I measure a hole to be .062+.0002 then I know that a .062 pistol pin will fit the hole....

Rgds
Eric

Last edited by egumpher; 05-28-2012 at 02:19 PM.
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