mikamarj Posted June 20, 2020 Share Posted June 20, 2020 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? Link to comment Share on other sites More sharing options...
yigal Posted June 20, 2020 Share Posted June 20, 2020 (edited) I would guess .252" a. .252" b. .260" c. .268" d. a&b wrong answer. Edited June 20, 2020 by yigal Link to comment Share on other sites More sharing options...
mikamarj Posted June 20, 2020 Author Share Posted June 20, 2020 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. Link to comment Share on other sites More sharing options...
yigal Posted June 20, 2020 Share Posted June 20, 2020 (edited) I thought you liked to guess. Edited June 20, 2020 by yigal Link to comment Share on other sites More sharing options...
Benevolence Posted June 20, 2020 Share Posted June 20, 2020 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. Link to comment Share on other sites More sharing options...
mikamarj Posted June 20, 2020 Author Share Posted June 20, 2020 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. Link to comment Share on other sites More sharing options...
yigal Posted June 20, 2020 Share Posted June 20, 2020 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. Link to comment Share on other sites More sharing options...
Benevolence Posted June 20, 2020 Share Posted June 20, 2020 No problem. I recommend you get the two Kuhnhausen 1911 books (they can be ‘acquired’ online as PDF’s too) if you’re going to start tinkering. Link to comment Share on other sites More sharing options...
mikamarj Posted June 20, 2020 Author Share Posted June 20, 2020 23 minutes ago, yigal said: I thought you liked to guess. No, I was genuinely looking for help, not smart-assery. Link to comment Share on other sites More sharing options...
yigal Posted June 20, 2020 Share Posted June 20, 2020 (edited) 18 minutes ago, mikamarj said: No, I was genuinely looking for help, not smart-assery. Edited June 20, 2020 by yigal Link to comment Share on other sites More sharing options...
ltdmstr Posted June 20, 2020 Share Posted June 20, 2020 (edited) Looks like that dimension is .252. Edited June 20, 2020 by ltdmstr Link to comment Share on other sites More sharing options...
ltdmstr Posted June 20, 2020 Share Posted June 20, 2020 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. Link to comment Share on other sites More sharing options...
Benevolence Posted June 20, 2020 Share Posted June 20, 2020 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? Link to comment Share on other sites More sharing options...
ltdmstr Posted June 20, 2020 Share Posted June 20, 2020 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. Link to comment Share on other sites More sharing options...
Benevolence Posted June 20, 2020 Share Posted June 20, 2020 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. Link to comment Share on other sites More sharing options...
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