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Old 11-15-2012, 10:48 PM   #1
Beaver Hunter
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Default Drilling Trunnion Holes in Receiver

I am working on a Hungarian Pistol Kit. I have a receive that does not have the Trunnion holes drilled. What is best way to determine where to drill them? Is there a template? Link to my kit is listed below:

http://ak-builder.com/index.php?disp...oduct_id=30214
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Old 11-15-2012, 11:33 PM   #2
hazmat97
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I am working on a Hungarian Pistol Kit. I have a receive that does not have the Trunnion holes drilled. What is best way to determine where to drill them? Is there a template? Link to my kit is listed below:

http://ak-builder.com/index.php?disp...oduct_id=30214
Try this. Haven't done the front end with it yet, but I did do the rear long rivet hole on my M92 build as the hole in the trunion was drilled too small. Works great so far.

http://ak-builder.com/index.php?disp...oduct_id=30060
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Old 11-15-2012, 11:36 PM   #3
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Old 11-15-2012, 11:42 PM   #4
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Not sure if my question was clear. My receiver doesn't have holes drilled for Trunnion. Trunnion is not virgin, so it has holes for rivets. How do I determine where to drill the receiver?
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Old 11-15-2012, 11:45 PM   #5
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Tape a piece of paper to the trunnion above where it slides in to the receiver.

Mark the trunnion rivet holes.

Slide the trunnion (with paper still taped to it) into the receiver

Use a punch to mark your holes.
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Old 11-15-2012, 11:54 PM   #6
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Originally Posted by nalioth View Post
Tape a piece of paper to the trunnion above where it slides in to the receiver.

Mark the trunnion rivet holes.

Slide the trunnion (with paper still taped to it) into the receiver

Use a punch to mark your holes.
Thanks!
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Old 11-15-2012, 11:55 PM   #7
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Not sure if my question was clear. My receiver doesn't have holes drilled for Trunnion. Trunnion is not virgin, so it has holes for rivets. How do I determine where to drill the receiver?
The first picture shows me lining up the end mill with the existing hole in the trunion. The second picture shows me sliding the receiver over the trunion and milling the hole. It's in exactly the right spot because neither the trunion or end mill moved since they were lined up with each other.
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Old 11-16-2012, 12:12 AM   #8
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The first picture shows me lining up the end mill with the existing hole in the trunion. The second picture shows me sliding the receiver over the trunion and milling the hole. It's in exactly the right spot because neither the trunion or end mill moved since they were lined up with each other.
OK, I see. Thanks for your help!
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Old 11-16-2012, 05:52 PM   #9
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use a post it for the piece of paper template.works great
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Old 11-16-2012, 07:24 PM   #10
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i love it when you post that pic blacksmith, i actually did my last reciever with that exact setup, the Kant Twist clamps and all. It works perfect everytime, i do have one question though, do you change tools every hole to a centerfinder to find center to line up? i have a dro set up comming in the mail so it should makeit easier for me to do after that. also can you use collets in the mini mill? i have the bigger 2hp 800lb mill myself but a buddy has one and only uses his chuck to mill, i told him he could have much more clearance with collets but dont know if you can use them on that mini mill
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Old 11-16-2012, 10:12 PM   #11
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i love it when you post that pic blacksmith, i actually did my last reciever with that exact setup, the Kant Twist clamps and all. It works perfect everytime, i do have one question though, do you change tools every hole to a centerfinder to find center to line up? i have a dro set up comming in the mail so it should makeit easier for me to do after that. also can you use collets in the mini mill? i have the bigger 2hp 800lb mill myself but a buddy has one and only uses his chuck to mill, i told him he could have much more clearance with collets but dont know if you can use them on that mini mill
On the center finder..

No, I probably should but I don't. I just drop the end mill close to the hole and line it up until it will drop down in there. It's easy to chip an end mill that way, but considering the amount of time I save on the 6 holes in the front and two in the rear I just figure it's worth the risk.

On the Collets..

Yes sir! and they are a must have, Since that picture I have purchased a full set of R8 collets and a good 4 inch mill vice, It made a world of difference. I'm currently in the process of upgrading it to CNC! These little machines are great for conversions and light enough one guy can wrestle them around.
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