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10/20/2017 1:01:18 AM
9/22/2017 12:11:25 AM
Posted: 7/14/2005 5:18:36 PM EDT
i know its late but im lazy

first start by putting masking tape over your trunnion and marking it with a #2



center puch the center of your holes



remove tape



drill vary small pilot holes (this way if you muffed up you have a small hole to hide instead of a large 1)
you should see light threw the holes and they should be centered in your trunnion holes



open your holes and your done
i usally run a countersink bit over it to remove any bir caused by drilling

Link Posted: 7/14/2005 6:35:08 PM EDT
It's about damn time!


I was just going to email you about this tonight, too.
Link Posted: 7/14/2005 7:03:12 PM EDT
True IZH, or over-stamped?
Link Posted: 7/14/2005 7:07:13 PM EDT
its forced
altho almost noone can tell the diff
Link Posted: 7/15/2005 3:22:28 AM EDT
I apologize if this is a stupid question.

Do you leave the tape on the upper part of the trunion when you slide the trunion into the receiver?

If not, how do you get the holes to line up exactly?

Link Posted: 7/15/2005 4:13:45 AM EDT
Yes. You pull the tape loose enough to slide the trunnion into the receiver but not enough to remove the tape completely. Just to the groove basically, slide it in, then put the tape back down.
Link Posted: 7/15/2005 5:06:21 AM EDT
Good info. Will try it on my next build.
Link Posted: 7/15/2005 5:54:24 AM EDT
Where the hell where you last night while I was practically destroying my receiver?? That is great advice and I will do it on all my future builds. Well, I just have one 10-32 size hole to hide. Thank god for JB Weld!

Heavyweight
Link Posted: 7/15/2005 8:47:58 AM EDT
Excellent thinking. Thanks for posting.
Link Posted: 7/15/2005 9:00:18 AM EDT
[Last Edit: 7/15/2005 9:01:20 AM EDT by AKMan434]
Excuse the newb question, but what diameter drill bits did you use when making the larger holes?
I'm thinking about doing a build myself and would like to know.
Link Posted: 7/15/2005 9:20:48 AM EDT
they arnt always the same size usally they are 5/32 or 11/64 tho
Link Posted: 7/15/2005 9:25:06 AM EDT
This should be a sticky.
Link Posted: 7/15/2005 12:58:47 PM EDT
I tried the "post it note" version of this method. It did not work well at all. I did not account for the thickness of the Cold Steel bent metal blank, plus I must have wiggled a little bit, because my small pilot holes were way off!

Just a friendly suggestion. I would only drill one hole at a time and get it perfect on one side of the bent metal blank. Then you can use the trunion as a drill guide to drill the second side of the bent metal blank very nearly perfect.

Yours,
One Rusted Nut.
Link Posted: 7/15/2005 7:44:04 PM EDT
[Last Edit: 7/15/2005 7:46:09 PM EDT by Mojo478]
Finally, good pics of the masking tape method. I never could quite understand how this was supposed to work but it's all clear now. THANKS SOCANDYMAN!!

Yep, this one is definetly worthy of a 'sticky'!
Link Posted: 7/15/2005 7:50:46 PM EDT
I gotta agree with what rusty nut has said.. Once you mark the holes on the tape, then slide the trunnion on the receiver.. The position of the holes will be off my a little.. \
Link Posted: 7/15/2005 8:16:43 PM EDT
[Last Edit: 7/15/2005 8:21:14 PM EDT by socandyman]
you bend the tape around the corner of the trunnion where the rec sits this makes up the diff for the rec





Link Posted: 7/15/2005 10:24:05 PM EDT
tagged
Link Posted: 7/16/2005 3:07:56 AM EDT
I see now.. Thanks for clearing that up...
Link Posted: 7/16/2005 7:26:05 AM EDT
[Last Edit: 7/16/2005 7:47:04 AM EDT by 2FALable]
OK so here's another options which basically uses placing the tape onto the receiver with the trunnion installed. If you are careful to lay your tape along the edge lines of the receiver, then mark the whole thing, it works well.



Lay the tape...



Mark the edge lines of the receiver and the groove line in the trunnion. (Pencil works well but I was too lazy to go get one)



I like to use a couple of pieces of sticky side up tape to put under the edge of the tape along the receiver to make little lift tabs. Silly in a way, but I think it helps.

Also it's important to secure the tape to the trunnion in two spots that give stability and counterbalance so that when you remove the trunnion you don't have too much shift.

Next you lift the tape from the receiver body, but not where it is secured to the trunnion. SLide the trunnion out, lay the tape back down, check the line you marked for the groove with the trunnion groove, and mark/punch holes in the tape.

Then slide the whole thing back together, lining up your marks.



Center punch your holes and commence drilling. I actually drill with the trunnion installed and through the tape. As above in the thread start with a small bit and drill the first hole. Check how close to center you are by looking at the well lit hole from the inside of the trunnion. You should be more than micro fractions of from center. If you are REALLY close then drill the last two holes and check them. Once you've got small holes that are close or centered, with the trunnion clamped into the receiver (so it doesn't push forward) you can usually drill with the right size bit for your rivets or walk up the size till you get there.

For the rear it really works the same way. For instance my PMKMS tape looked like this:



All the holes were drilled with the trunnion in place. Once the rivet holes are right, I'd recommend rivets the trunnion in place to allow you to work the folding stock holes to the right size. For the folder you can drill the holes in the receiver to the biggest you can get them, like the big hole you can actually drill all the way to a 1/2 bit. Then use your drill with diamond tip bits or brown grind stones to remove metal in the hole. Really easy.



EDIT: By the way by drilling with the trunnion in place it one helps to guide the bits and two using a drill press, once you drill your hole, you can drill straight through the hole in the trunnion and out the opposite side of the receiver, now both sides are drilled perfectly.
Link Posted: 7/18/2005 5:31:44 AM EDT
[Last Edit: 7/18/2005 5:33:48 AM EDT by 2FALable]
By the way, that underfolder tape is from a PMKMS rear trunnion. The Yugo is a tiny bit harder because it has an angle to the back of the receiver, but you can still line it up with the notch for the bolt carrier and the top of the receiver.
Link Posted: 7/20/2005 6:06:52 PM EDT
Good info...tag
Link Posted: 7/27/2005 7:45:23 AM EDT

Originally Posted By socandyman:
its forced
altho almost noone can tell the diff


Where do you get stamps to do that? I want to do a German AK and need a K3 stamp.
Link Posted: 7/27/2005 10:01:10 AM EDT
a local engraver hooks me up
if you send me pics of what you need i can ask him if he can do it
Link Posted: 7/27/2005 11:07:02 AM EDT
great post, it should be stickied. i'm going to be ordering two recievers soon and using the tape trick. what size bit did you use to drill the final holes?
Link Posted: 7/27/2005 2:38:07 PM EDT
5/32 ?
they arent all the same
Link Posted: 8/14/2005 5:17:32 AM EDT
btt for someone that asked about this thread...
Link Posted: 8/15/2005 3:17:33 PM EDT
Can the mods please tack this thread.
Link Posted: 8/15/2005 3:37:00 PM EDT

Originally Posted By socandyman:
its forced
altho almost noone can tell the diff



Where do you get the stamps?
Link Posted: 8/15/2005 3:41:13 PM EDT
i have a local engraver do them
funny thang is he dosnt even understand what they are LOL

he charges 17-20 (think it depinds on his mood )
Link Posted: 8/16/2005 7:50:32 AM EDT
btt
Link Posted: 8/21/2005 10:03:49 PM EDT
[Last Edit: 8/21/2005 10:05:58 PM EDT by NAVYRETIRED1]
great trick i've used celuloid and it was marginal. but i always drill small to make sure trunion is aligned correctly then open one hole to trunion to corect drill size. i then install my transfer punch in that hole it keeps alignment while you do one at a time in that manner. after holes on one side are finished i pull out my alignment pins one at a time and drill through to other side with trunion in place.
Link Posted: 8/24/2005 7:32:35 PM EDT
btt
Link Posted: 9/15/2005 11:50:14 AM EDT
btt, should be a sticky
Link Posted: 10/2/2005 12:33:26 PM EDT
Link Posted: 10/2/2005 5:17:06 PM EDT
Tag
Link Posted: 10/3/2005 1:55:38 PM EDT
Tagged!
Link Posted: 10/4/2005 6:44:06 AM EDT
wouldnt it be easier to just use the old receiver plates from the kit?

cut them to lay on top and drill?
Link Posted: 10/4/2005 8:38:24 AM EDT
Tagged....for build later this month
Link Posted: 10/4/2005 6:02:45 PM EDT
[Last Edit: 10/4/2005 6:04:37 PM EDT by BulletBait]

Originally Posted By donovan007007:
wouldnt it be easier to just use the old receiver plates from the kit?

cut them to lay on top and drill?

That's another way, just don't use the front edge as a guide as the new and old receiver might not be the same length.


Link Posted: 10/4/2005 7:42:19 PM EDT
Well the Polish PMK's for instance did not come with receiver stubs on them, so in that case it would be tough to use them for a template.

On a Rommie kit, yes it works fine.
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