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Old 04-28-2016, 06:40 PM   #1
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Default Tortort 80% m72 build

Got some work done on a tortort 80% this week and thought I would share.

Unfortunately I forgot to get pictures of my setup. This is probably the biggest part I would want to try to fit on my mini mill. I indicated and clamped a 1-2-3 block on the top of the table and touched off on that. Top rails were flat against the 1-2-3 block and the receiver was clamped directly to the table. This allowed me to flip the receiver without indicating it each time, only had to find the front edge of the receiver.

I used RForbus' AKM receiver print for all of the coordinates.
http://robertforbus.com/wp-content/u...oviet_era_.pdf



Easy side, two reamed 7mm holes and a 5mm hole for the safety lever.




Luckily I drilled the safety hole first since my only 5mm reamer barely made it through the hole on the other side. Front of the hole was drilled with a 13/64 bit and the 10mm hole was cut with a boring head, finished off with an endmill to connect them. I wanted to avoid taking a cutoff wheel to any part of this receiver, which is how I've done the safety hole in the past.

Protip; Edgefinders have a radius, and unless you want your part to be all kinds of messed up you need to compensate for it. Some of you may notice that it looks like safety hole was cut twice, offset by exactly .100" and you would be correct. It took me a few minutes of scratching my head wondering why my safety was going in at a funny angle to figure out where I screwed up.



Put the vise back on and went at the 'selector stop' machined into the receiver. Surprisingly the mini mill did not care at all about cutting hardened 4140 with a 1/2" AlTiN coated carbide endmill I acquired from the scrap bucket at my old job.

corners of the trigger opening were drilled to 4mm and 9/64 for the end of the trigger hook notch and the opening was finished with a 4mm endmill that was also liberated from the scrap bucket.

You can also see the ejector has been trimmed as well. No measurements used, just got it close with a 3/8 carbide endmill and took .010" off a pass until I was barely able to get the bcg by, then cleaned it up with a file.



Trigger guard and grip lug riveted on. Is there a good way to install these? I ended up drilling a hole in an aluminum block to fit the forming piece from an ak-builder long rivet tool, clamped that in a vise, balanced the rivet/receiver on the cup and formed the other side with a punch and bfh. FCG fits and functions even with the screwed up safety hole. I will eventually weld it partially closed and recut, but it is not a priority since it works as is

Markings were made with a weaponmark etch kit and tool. I bought a double angle diamond wheel at harbor freight and it was way too big to make accurate selector detents so I need to find a good cutter for that. Anyone have any ideas?

Next step is pressing and headspacing the barrel but I need to modify my trunnion support for that. Receiver will eventually be rust blued once I find an etch stencil for the zastava markings on the left side. I'll update the thread as I get more work done.
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Old 04-28-2016, 06:52 PM   #2
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The stock will be at an odd angle when you mount it because a yugo receiver has a different angle at the rear than a standard AK.
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Old 04-28-2016, 07:17 PM   #3
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Quote:
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The stock will be at an odd angle when you mount it because a yugo receiver has a different angle at the rear than a standard AK.

If hes using an M72 stock it will mount perfect on this Yugo style receiver.
Factory style.
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Old 04-28-2016, 07:18 PM   #4
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Youre doin alright DFM keep it up!!
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Old 04-28-2016, 07:29 PM   #5
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Youre doin alright DFM keep it up!!
Thanks. I like the changes to this receiver compared to the first run you did. Very nice to build on. I'm probably going to pick up a russian fixed stock or two when you're done with them.

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The stock will be at an odd angle when you mount it because a yugo receiver has a different angle at the rear than a standard AK.
I mocked the stock up earlier and didn't notice that. Went out to double check and it looks normal to me, although it's kind of hard to tell without a barrel.

Went out a second time and put the original stub on the 80% and it lined up perfectly, the angle was not off at all.
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Old 04-28-2016, 07:33 PM   #6
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Thank you!
Yes, new Yugos match nicely. It all changed with that fancy lightening cut tiool
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Old 04-28-2016, 08:49 PM   #7
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Thank you!
Yes, new Yugos match nicely. It all changed with that fancy lightening cut tiool
will you ever sell a done receiver?or do it for a ffl?
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Old 04-28-2016, 10:33 PM   #8
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will you ever sell a done receiver?or do it for a ffl?

Trying to get there
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Old 04-28-2016, 11:04 PM   #9
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Quote:
Originally Posted by tortort View Post
If hes using an M72 stock it will mount perfect on this Yugo style receiver.
Factory style.
The stock might bolt on just fine but the angle of the back of that receiver is wrong for a yugo. The back of that receiver slants forward, the back of a yugo receiver slants rearward.
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Old 04-28-2016, 11:40 PM   #10
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Originally Posted by TheGreek! View Post
The stock might bolt on just fine but the angle of the back of that receiver is wrong for a yugo. The back of that receiver slants forward, the back of a yugo receiver slants rearward.
Not quite. Both slant forward towards the bottom, but the angle is more pronounced on the type 3 vs yugo. I think it's something like 82 rather than 85 degrees....something like that.
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Old 04-29-2016, 12:23 AM   #11
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Quote:
Originally Posted by TheGreek! View Post
The stock might bolt on just fine but the angle of the back of that receiver is wrong for a yugo. The back of that receiver slants forward, the back of a yugo receiver slants rearward.
Kinda looks like it slants forward in the picture but it doesn't.
It has the same angle as factory Yugo.
2.5 deg if I'm remembering correct.
it's the pic making it look weird
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Old 04-29-2016, 12:24 AM   #12
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Not quite. Both slant forward towards the bottom, but the angle is more pronounced on the type 3 vs yugo. I think it's something like 82 rather than 85 degrees....something like that.
yep
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Old 05-01-2016, 10:21 AM   #13
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Quote:
Originally Posted by tortort View Post
Kinda looks like it slants forward in the picture but it doesn't.
It has the same angle as factory Yugo.
2.5 deg if I'm remembering correct.
it's the pic making it look weird
Can you post a picture or drawing that shows the angle of the rear of the receiver better? It will help out those who don't understand photographic perspective and how it plays tricks on angles, etc.
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Old 05-01-2016, 11:15 AM   #14
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Hahahha Im sure DFM will have pics of this guy running
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Old 05-02-2016, 01:36 AM   #15
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I want to see a better pic of the back of a tortort yugo receiver and if possible I want to see it compared to a real yugo receiver. Until I see better pics I'm gonna keep thinking that the angle of the back of tortorts yugo receivers are not correct for a yugo.
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Old 05-02-2016, 02:31 AM   #16
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Great work
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Old 05-05-2016, 06:14 AM   #17
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why did you mill off the trigger guard spacer??? the one i built was spaced perfect. love the way mags lock into a milled receiver
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Old 05-05-2016, 01:41 PM   #18
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why did you mill off the trigger guard spacer??? the one i built was spaced perfect. love the way mags lock into a milled receiver
Because thats not how yugo's are built. They are built like a stamped receiver with a separate safety/mag stop plate
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Old 05-05-2016, 01:42 PM   #19
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Quote:
Originally Posted by TheGreek! View Post
I want to see a better pic of the back of a tortort yugo receiver and if possible I want to see it compared to a real yugo receiver. Until I see better pics I'm gonna keep thinking that the angle of the back of tortorts yugo receivers are not correct for a yugo.
same here
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Old 05-08-2016, 12:08 PM   #20
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Got a chance to cut the selector notches today. I used a .750" 60 degree dovetail cutter, each notch required two cuts since I was too cheap to get a 120 degree double angle cutter. iirc they were cut 0.55mm deep.

Unfortunately I need to find an er16 collet extension to cut the second half of the 'safe' notch since the spindle of my mini mill won't clear the trigger guard. Using a dovetail cutter like this definitely takes some patience to get the alignment right between the two cuts but if you do them before you rivet the trigger guard on you can save $100 over buying the DA cutter.



Quote:
Originally Posted by timhogan427 View Post
why did you mill off the trigger guard spacer??? the one i built was spaced perfect. love the way mags lock into a milled receiver
The spacer was also perfect for me but my kit came with a selector stop so I figured it would be more correct for my build to mill it off and use that.

Quote:
Originally Posted by TheGreek! View Post
I want to see a better pic of the back of a tortort yugo receiver and if possible I want to see it compared to a real yugo receiver. Until I see better pics I'm gonna keep thinking that the angle of the back of tortorts yugo receivers are not correct for a yugo.
If the angle is incorrect it is only by less than a degree.
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Old 05-08-2016, 12:21 PM   #21
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If the angle is incorrect it is only by less than a degree.
Thanks for the pic, it answers the question I had about the angle.
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Old 08-30-2016, 12:09 PM   #22
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I took the easy way out on the cover plate. Slot is milled .070" deep instead of the full depth to save time and tools. I used the same 60 degree 3/4 cutter from the selector notches to cut the dovetail for the cover plate. Ideally I would have used a smaller diameter cutter but I cut up the CNC warrior plate to fit and you can't tell.

I went by the dimensions in this thread (http://www.akfiles.com/forums/showth...=269123&page=2) and the CNC warrior plate is not the best fit. The radius of the corners is closer to 3/16 than the correct 7 mm and it is about .030" shorter than it should be. I filed the radius and it fits and doesn't look terrible, but I'll probably try to track down an original plate at some point.

I picked up a steam table tray and I have a carding brush and some rust blue solution in the mail so that will be one of my projects next week.



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Old 08-30-2016, 12:55 PM   #23
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nice work/idea. you might want to mill a groove down the center for the cleaning rod as it goes way back into the cavity. (if you are using one)
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Old 08-30-2016, 01:09 PM   #24
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nice work/idea. you might want to mill a groove down the center for the cleaning rod as it goes way back into the cavity. (if you are using one)
That was my original idea but I forgot about it when I had it on the mill. Thanks for the reminder, I probably would have finished the build and wondered why the cleaning rod didn't fit..
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Old 08-30-2016, 01:30 PM   #25
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Quote:
Originally Posted by DFM5609 View Post
That was my original idea but I forgot about it when I had it on the mill. Thanks for the reminder, I probably would have finished the build and wondered why the cleaning rod didn't fit..
ask me how i know...
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Old 08-30-2016, 07:25 PM   #26
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ask me how i know...
Derp! +2
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Old 08-30-2016, 07:33 PM   #27
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man seeing all these pics of progress of tortort's 80%ers makes me want to buy a mill, damn yall and yalls fancy tooling lol. ima just stick to my rewelds lol.
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Old 08-31-2016, 05:16 AM   #28
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damn machinists and their awesome skills! great work.
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Old 09-01-2016, 03:14 AM   #29
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Looks good!

I would love to see an m72 with an underfolder assembly on one of these!
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Old 09-01-2016, 08:22 PM   #30
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Ok, that's pretty awesome work there. Is there anyone willing to do the bottom plate cut for payment?
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Old 09-03-2016, 04:25 PM   #31
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Thanks for sharing!

Your build is coming along very nice. I would like to do one of these in 5.56/223.

Would you guys know if the Yugo 5.56 factory mags would fit this receiver?
would ejector tab be an issue?

Sorry for the hijack.

Like the 80% Milled option
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Old 09-03-2016, 08:26 PM   #32
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Thanks for sharing!

Your build is coming along very nice. I would like to do one of these in 5.56/223.

Would you guys know if the Yugo 5.56 factory mags would fit this receiver?
would ejector tab be an issue?

Sorry for the hijack.

Like the 80% Milled option
The ejector tab will be wherever you want it. The 5,56 x 45 and 7,62 x 39 magazine wells are similar enough to make it work.
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Old 09-03-2016, 11:52 PM   #33
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Quote:
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Hahahha Im sure DFM will have pics of this guy running
why don't you mill in the cover plate slot?if you did than anybody with a drill press could finish your receiver,might bring in more customers.now that I see you need a mill for that step I cannot get 1 of your receivers.
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Old 09-04-2016, 12:11 AM   #34
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why don't you mill in the cover plate slot?if you did than anybody with a drill press could finish your receiver,might bring in more customers.now that I see you need a mill for that step I cannot get 1 of your receivers.
This section was pointed out in the ATF submission part and can not be altered without another declaration letter.
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Old 09-04-2016, 12:12 AM   #35
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We hope to have our FFL soon.
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