countersink degree of seer and hammer pin hole 1911?

[atalon]

I am building a 1911 from an 80% frame and needed to ask a question I don't see anywhere. As most of you know, the 2 pins for the hammer and seer have a tapered end on the left side to keep them from falling through and the thumb safety sits on top of them to keep the in. I was wondering what the degree of countersink tool was needed for these pins. I just cut the holes and the only countersink I have is an 82 degree. Is this correct or do I need a different angle?

 

[Tbarn2]

I have a PDF of a 1911A1 blueprint. If I am reading it correctly, it shows the hammer pin countersink is 60° x .02". It does not show a countersink for the sear pin. You might consider drilling and countersinking a test hole in some scrap metal. I hope this helps.

 

[atalon]

AH kewl thank. good idea on the scrap as well.

 

[atalon]

I did a search for 60 degrees and found the drill hole starters for my mill have a 60 degree angle. Tested it on a piece of aluminum and it works great. I just finished using it on the frame and the pins are now nicely flush.

Also the pins I got in the parts set for the 1911 had both pins with tapered ends and it makes sence since they both sit under the thumb safety in the same manner. Must have just been left out of the blueprint or some of the parts manufactures decided it was better that way (just guessing).

 

[Tbarn2]

I'm glad it worked out. This sounds like an interesting project.

 

[1911ly]

Please share some pics of your build!!! It would be awesome to see.

 

[CountryBoy19]

the drill hole starters for my mill have a 60 degree angle

Those are called a combination drill/countersink... some call them by their alias, "center-drill"

I've never heard them called hole starters..

 

[Drail]

'hole starters" LOL You just can't make this stuff up. My wife calls a compass "that thing that makes circles."

 

[atalon]

Yeah couldn't remember the the official name but I know you are supposed to use them to start a hole so the drill bit doesn't walk and start at an angle.

 

[indyjohn]

I really need to put eyes on this press you've been telling me about for the last.. geez how many months now????

 

[atalon]

Let me know when you have some free time on the weekend and want to stop by.

 

[CountryBoy19]

Yeah couldn't remember the the official name but I know you are supposed to use them to start a hole so the drill bit doesn't walk and start at an angle.

Haha, no problem, just gave me a little chuckle... To be fair, as long as you are able to accurately convey your point I don't care what you call them. There are many times I can't think of the right term for things and hope that nobody will ridicule me for...

 

[1911ly]

I have heard it called the counter sinky center thingy. We knew what you were talking about. And the obligatory:

 

[atalon]

so this is a Tactical Machining frame (they just have 4140 steel, no stainless yet). All the rest of the parts are stainless where possible. I don't have a picture of after the countersink I will get that one tonight. Just got the Caspian slide in yesterday. This is being built for 10MM.

 

[1911ly]

That's going to be a awesome project. Please post updates as you go! This is the kind of stuff is what the gunsmithing forum is all about!

 

[atalon]

So here is the picture after countersinking.


So I have been checking how I am going to fit the barrel to the slide and I see I have a lot of work ahead of me. I was a bit nervous but see it is all part of the 1911.

 

[1911ly]

So here is the picture after countersinking.
View attachment 33061

So I have been checking how I am going to fit the barrel to the slide and I see I have a lot of work ahead of me. I was a bit nervous but see it is all part of the 1911.

View attachment 33064
View attachment 33065
View attachment 33069

I have found a few youtube video's on fitting the hood. I'd ask AllenM for some advice. He knows the 1911 very well (and that is a understatement).

 

[atalon]

So I cut the rails in and it looks like I may have cut one side bit much vertically. I don't really have the tools to measure that small of a gap so I was trying to go off of cutting a little bit and checking it against the back end of the slide but somehow I went from wont fit to a bit sloppy. Hopefully it is not enough to effect function too much. Still had to use lapping compound and a mallet to mate the slide to the frame so at least one side was a nice fit.

 

[AllenM]

if you want some help fitting the barrel let me know

 

[atalon]

It is now functional thanks to AllenM. There were some issues with the barrel link and slide stop distances that I would have probably ruined the barrel and/or frame trying to get it to work. Ready for test firing and then some blending work to smoot out the back end. I might see about putting the checking on the front strap as well.

not sure what caused the purple edges other than crappy lighting.