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1911/2011 sear and hammer pin hole locations


mikamarj
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I have a microscope and want to make a jig for looking at the sear engagement.


http://www.gunsmithinfo.com/images/Drawings/1911 Receiver.png is the best picture I have found but I have a hard time understanding that...

From the picture I can see that sear pin hole is .110" (+.002). Hammer pin hole is .1575" (+.0015).

Horizontally their distance should be 2.973"-2.602"=0.371"

 

But what is the vertical distance of those holes?!
I would guess .252" but I'm not familiar with old American technical drawings so I don't know why the line is split into two?

image.thumb.png.3af7190f5ece7abc74852ed45144993e.png

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6 minutes ago, yigal said:

I would guess .252" 😉


Ok so same guess as mine...

What does the line splitting then mean? What does 0.16" refer to?

 

6 minutes ago, yigal said:

a. .252"

b. .260"

c. .268"

d. a&b  wrong answer.

 

Now you're making me more confused.

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5 minutes ago, Benevolence said:

They’re located referenced to the slide stop hole; the hammer hole is 0.016” above and sear hole is 0.252” below. So, 0.268” nominally. 


Thank you, this was the kind of help I was looking for. :)

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4 minutes ago, Benevolence said:

They’re located referenced to the slide stop hole; the hammer hole is 0.016” above and sear hole is 0.252” below. So, 0.268” nominally. 

        

You passed the test successfully 😉

       100.

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4 hours ago, Benevolence said:

They’re located referenced to the slide stop hole; the hammer hole is 0.016” above and sear hole is 0.252” below. So, 0.268” nominally. 

 

That's not correct.  The .016 dimension is for the plunger tube hole.  The hammer pin hole is inline with the slide stop hole.  And the sear pin is .252 lower.

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4 hours ago, ltdmstr said:

 

That's not correct.  The .016 dimension is for the plunger tube hole.  The hammer pin hole is inline with the slide stop hole.  And the sear pin is .252 lower.

I hope I’m not mistaken 😬

 

I thought the plunger tube holes were 0.076” above the slide stop hole?

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1 hour ago, ltdmstr said:

Yeah, my mistake.  You had it right.  From the slide stop it's .016 to the hammer pin and .252 to sear pin.  Sorry about that.

Whew okay. No problem haha. I was spooked because I had just drilled the hammer and sear holes for an 80% and am still fitting the rest of the parts. 

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