I got greedy and thought I was more talented than I am. I have an AMD65 and was drilling out rivets on the rear trunion. Thought I could drill straight through........negative! It is now useless. Any recommendations on where to get a new one? Will an AK74 rear trunnion work fine? Thanks for any input.
Rear Trunnion Destroyed
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kpd007 said:
How is it destroyed?If we're talking about an AMD-65, the rear trunnion rivets should be all the way through. Thus, you either need to punch the rivets out, or drill all the way through the trunnion to get it out. There are various ways to get it out, but the hole does go all the way through on both rivets. What exactly happened? Did the bit just stop half way through. Many times you will actually run into the side of the hole while drilling and the bit will bite into the side and you can't go any furthere. A sure sign of this is if the bit breaks off or there is a lot of squealing while you drill. Give us a little more info. to help you get it straightened out.
OK. What happened was that I vised the sucker in on my drill press. I thought I had it lined up to run straight, but that was not case. Went in straight on one end, and came out at an angle on the other. The drill press went through it w/ no signs of the trunnion being drilled into. I had actually vised it in at an angle so I can only blame myself, not the chinese press. I don't think it can be salvaged. There isn't enough of the trunnion left to tap on the one end.
Not to get off topic, but I drilled out the rivet's on the front trunnion and was into the barrel about 1/10 cm. I wouldn't think this is much of a big deal, but I mismeasured and did it to all of them. Anyone see problems with that?
Not to get off topic, but I drilled out the rivet's on the front trunnion and was into the barrel about 1/10 cm. I wouldn't think this is much of a big deal, but I mismeasured and did it to all of them. Anyone see problems with that?
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1/10cm doesn't seem really big. There is another guy who posted today who drilled most all the way through his barrrel. He may end up welding it up to fix it. Can you take pictures of the hole you drilled in it? I don't think you'll have any problems if its only that small. So, you're doing a screw build I assume. This is the only reason why you wouldn't be able to use the rear trunnion anymore. Actually, you can still use the rear trunnion. Here are a few options you still have.kpd007 said:
1)
Do you mean there isn't enough of the rivet left in the hole of the trunnion to tap the hole? If this is the case, you can always move up to a bigger size tap and screw to fix this problem.
2)At this point, you've got most of the hard work done. Put a few larger sized drill bits in and drill out the entire rivet. Push whatever is left over out with a punch. Instead of using screws in these holes, use rivets instead. The rear uses 2 long rivets which are actually probably the easiest to use. Push them through, and lay your receiver on its side with the head of the rivet on the flat edge of your vice. Pound the opposite end of the rivet with a hammer. Many people use this technique with great success. I know that Hotbarrel and I both do this.
I don't know what look you're after, but the more original look would be the rivets for the rear. But if your entire rifle is a screw job, you might want to go with the bigger screws and taps just on the rear.
3) One last thing I thought about while I was writing. You actually could use the same size screws if you wanted them really bad. You could use the rivets, push them through, and then cut them off flush with the trunnion. Retap the hole, except this time don't drill all the way through!
Good luck with your build and feel free to ask these guys any questions. They will always have an answer for you!
It's the rear trunnion Winn, it would work for the front, but I got those holes drilled out OK. That is the only spot to tap or rivet. I don't have a digital camera to post a pic, but I think that I will pick up some steel or a rear trunnion rivet, push it through, cut it off and redrill like yosuthnmasa suggested. I would not have thought of that. That is why we are all here I guess.....thanks.
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