TNW Project

[tomcatshaas]

it begins. I need to fit the ejector some more.

TC

[j.bal]

It does look pertty!

[tomcatshaas]

can anyone show me or tell me if the pin hole that pins the receiver lafette pin in place (pictured in the circle) goes all the way through the receiver to the inside? I suspect it does as you would not be able to remove it. An inside picture would be nice. thanks!

TC

[Bil]

TC-the hole DOES go all the way through.I checked with a receiver section I have.I used a small drift and hit the pin down from inside,then hit it in from the bottom.I am assuming what I hit was the bits left over after the lafette mounts were driven out.BTW,where can I get these mount pieces? I suppose I could make them.Hope this helps,I could not get a picture of the inside,but the pieces definately went all the way through. ---bil

[tomcatshaas]

thanks bil. I have an extra original lafette mounting pin if you want it. I bought it before IMA sold out of them. But I don't need it as a new one came with my TNW rec. kit.

thanks again,

TC

[Bil]

Thanks,TC.I would appreciate that.PM me with details ---bil

[RaccoonRough]

What about the actual pin to secure one in place. I need one of those. Or two of those......... Is there some sort of ready made stock that I can use for pins? I may also need a pin for the top feed tray hinge to keep it in place.????

I am sure that someone knows what size the pins need to be so I can somehow find some.

Thanks

RR

[tomcatshaas]

What about the actual pin to secure one in place. I need one of those. Or two of those......... Is there some sort of ready made stock that I can use for pins? I may also need a pin for the top feed tray hinge to keep it in place.????

I am sure that someone knows what size the pins need to be so I can somehow find some.

Thanks

RR

Are you using an original rec. or a TNW rec.? All the pin holes on the TNW are drilled to standard nominal hole sizes ie. 3/32" and 1/8" which you can use standard roll pins (spring pins) cut to length or make your own by getting drill rod. I get all my stuff
from http://www.fastenal.com

If you are using the original rec., which the holes are metric, you can also use roll pins. I get my metric roll pins from http://www.fastenal.com also. I have not found any metric drill rod yet.

TC

[Bil]

The original pins are solid,I don't suppose it matters.I think a roll pin might stay better.The original pins sheared off clean when the lafette mount was removed-I wonder why they even bothered to take them out anyway? ---bil

[RaccoonRough]

Thank you Bil and Tomcatshaas!

I need the pins for an original Semi Auto receiver.

I need pins for the latch hinge pin and the lafette mount pin. Any idea what sizes I might need?

Thanks

RR

[tomcatshaas]

Thank you Bil and Tomcatshaas!

I need the pins for an original Semi Auto receiver.

I need pins for the latch hinge pin and the lafette mount pin. Any idea what sizes I might need?

Thanks

RR

I measured the hole in the lafette mount pin I am going to send to bil using a #39 drill bit which is about .0995" that converts closely to 2.5mm. For the top cover hinge pin I measured other pins I have here and they where all .118" so that is 3mm.

[tomcatshaas]

For the most part, it is together. I will try to test fire a few rounds this weekend. Then take apart and do the final debur, and polish if needed to get ready for blueing.

I am disapointed in the helix60 parts and had to abandon them and go with the TNW supplied sear and trigger arm. The helix60 trigger arm with the half moon thingy didn't fit at all in my TNW rec. Tried to ream the hole up, but they are too far off. The sear also didn't pass the safety checks for the semi auto. The TNW trigger arm and sear works well dry fire testing. The helix60 set up for me is money down the drain.

TC

[Bil]

Very nice-it will look good on the lafette!Thanks for the pics,I am glad to see this has worked out for you after a rough start! ---bil

[tomcatshaas]

Well went to the range today. Good news, it went bang and not kabooom!.

Bad news, it doesn't go bang every time. And it doesn't eject. It will eject if I rack the bolt with the changing handle, but I suspect the bolt is not cycling at all. I have an 11mm booster cone which I drilled out to 11mm from one of those 9.5mm cones. Need to trouble shoot this further, but I need to figure out why the sear is not tripping every time. The trigger gate (half moon) is just missing the sear by a few thousands and slipping off the sear to the rear. I need to check the dimentions of the bolt and see if heli
did the mod correctly. It's as if the TNW sear arms either too short or the trigger gate is too far aft.

TC

[tomcatshaas]

barrel moves freely all the way back and forth in receiver with recuperator returning it. I think the bolt is not unlocking or short stroking. Perhaps the small step on the left side in the picture needs to be smoothed down a bit above the cam. But I need to get the trigger/sear to operate flawlessly before I can really address the failure to eject. Right now I am chambering one round at a time, no belt, romanian ammo, until I can get these issues solved.

TC

[tomcatshaas]

I think I have solved the trigger/sear issue. I will post pictures and findings later.

TC

[tomcatshaas]

ok, the TNW sear ring which the front of the sear catches is .100" but has a notch that measures .090" where the sear catches every time, so that is a differance of .010".

The helix60 sear ring is .100". I put it in, and it works. However, it does not have the ears like the TNW sear ring to keep it from spinning.

With the TNW sear ring installed the overall measurement from the bolt face to the back of the sear is 5.905"

With the TNW sear ring installed the measurement from the bolt face to the back of the
sear is 5.915" the .010" differance that is needed. I did measure all the other bolt mods that helix60 did, and they are consistant with the drawings.

I will contact TNW and ask if they could make me a differant sear ring that measures .100" so I can use it with their sear ring retaining ring instead of the helix60 provided external retaining ring which the sear has a tendency to hit the ears on the ring.

TC

[helix60]

TC,
I am sorry you are having problems with the converted parts. I have no idea if TNW receivers are spec to the origional design less semi modifications. If TNW's sear pin and safety holes are not to spec then my trigger bar apparently will not work correctly. I am more than willing to help fix this problem. As you have noted before TNW has changed a number of dimensions to english standard instead of the origional metric. I have never handled or seen a TNW in person, all the work was done by reverse engineering off of origional german parts and receivers. The parts are warantted.

For the most part, it is together. I will try to test fire a few rounds this weekend. Then take apart and do the final debur, and polish if needed to get ready for blueing.

I am disapointed in the helix60 parts and had to abandon them and go with the TNW supplied sear and trigger arm. The helix60 trigger arm with the half moon thingy didn't fit at all in my TNW rec. Tried to ream the hole up, but they are too far off. The sear also didn't pass the safety checks for the semi auto. The TNW trigger arm and sear works well dry fire testing. The helix60 set up for me is money down the drain.

TC

[tomcatshaas]

I went to the range. I now can get it to eject a round. What I did is round over and polish the small step on the right side just above the cam to help the right bolt roller glide up the cam and over into the bolt slots better. Also per Lance, lubed the barrel bearing surface, the rear of the barrel lugs, lubed the bolt and rollers with the recommended tw25b grease. Boy is that stuff slick.

Fed one round at a time for about 10 rounds. Then put 5 rounds into a belt and fed about 10 rounds. Now I think I have one of those soft TNW sears as it doubled a few times and the big consern is it slam fired twice meaning the sear either didn't catch or it slipped when I chambered a round. I am still using the TNW sear and the TNW trigger arm, but the helix60 sear ring.

I think I am going to install the TNW sear ring back in and test. Also contact Lance and discuss the issue and soft sear possibility.

Also, Helix60 is going to make me a new trigger arm to fit the TNW receiver and I am looking forward to being able to try out the Helix60 set up.

TC

[tomcatshaas]

ok, I was looking through all my parts from TNW and I found another sear ring. I installed it and did my dry fire safety checks and it all works nice. Trigger trips the sear every time so far.

I do remember when I got the receiver kit some of the parts where there and some where missing due to heat treatment issues. 2 weeks later I received a sear, holder and another sear ring. Perhaps I had the wrong sear ring in the first time.

I will test again this weekend. I will be the last weekend as the range is closed in November for deer season.

TC