.38/.357 prototype

[bruski]

Well, so far I have been patiently waiting for a clear down range and it is near. I have watched the fields being plowed, disked, laser leveled, flood irrigated, rows listed up, rows shaped, rows planted, sprinkler pipes laid down, sprinklers sprinkling, sprinkler pipes picked up and now field workers hoeing weeds. There should be no more action with the exception of an occasional irrigation until harvest time. On the other hand, I have to go to LAX to pickup my mother-in-law again. This could go either way, with more shop time I hope or with a lot of honey do\'s.

 

 More to come soon I hope with the prototype.

 

bruski 

[Cutter]

Cutting notches in the barrels tonight.

Two down four to go.

 

https://www.youtube.com/watch?v=2eeNgbUkb_M\' title=\"https://www.youtube.com/watch?v=2eeNgbUkb_M\">https://www.youtube.com/watch?v=2eeNgbUkb_M

[Sparky_NY]

Looks great Cutter !

[Cutter]

I had to modify the extractor tip , feels good anyway.

Really won’t know until firing

[Cutter]

I put .015 flats on the barrels, 3/16 wide, then used

10-32 X 1/4 dog point SS set screws. ( used those because I had them )

 

[Sparky_NY]

With no hex on the barrels, how are you tightening them?             Homemade collet?

[Cutter]

With no hex on the barrels, how are you tightening them?             Homemade collet?

 

Yes Sir, That\'s plan A

[Sparky_NY]

Plugging away.   Main shaft made up.  

 

Just your basic home security system....  southern style !

[Cutter]

Sparky

How long iand how heavy  ?

[Sparky_NY]

Sparky

How long iand how heavy  ?

31-1/2 OAL       VERY heavy, prob about 60 lbs like Bruski\'s I would guess.     Been meaning to anyhow, I will weigh it when I go back out to the shop.    Made up a redneck stand to hold it today to make it easier to work on for the final stages.

[Sparky_NY]

51-1/2 lbs      no top cover, no cocking mechanism, no bolt loading plug, no fancy nuts on mainshaft       otherwise pretty complete

[Sparky_NY]

Suggestions for methods requested:

 

When installing the 2 cam halves into the housing....   how do you assure the 2 halves are properly indexed to each other (rotationally).      I find that if one cam is misaligned with the other by even a tiny amount the gap will be larger on one side than the other (feed side vs eject side) and cause binding on one side and excess clearance on the other.

 

In hindsight,  one way would be to machine the 2 halves at one and leave them connected with tabs until installed, then remove and cut away the tabs before reinstalling.    (too late for that for me.. I made the 2 halves separately, they do mate up perfect though)

[Cutter]

Here’s my 2 bits,

 

Difficult to answer not knowing exactly what your procedure was.

I put in all holes in casing, frame, and cam before assembling.

With .005-.010 on the clearance holes.

 

Maybe clamp the halves together and put in locating holes.

[bruski]

The drawings for the RG-G or was it the D & E mention to put a scribe line on exactly BDC on both pieces. That gets your alignment right and to use some spacer pins to get your gap right.

 

bruski 

[Sparky_NY]

The drawings for the RG-G or was it the D & E mention to put a scribe line on exactly BDC on both pieces. That gets your alignment right and to use some spacer pins to get your gap right.

 

bruski 

Thats pretty much how I have done it before.   Its a pain though trying to see and line up things visually deep inside the housing though. 

 

Usually Cutter has some super simple, super accurate way of doing some processes that leaves one feeling like a complete idiot.    Even I notice that this 2nd gun is being much easier to build than the first one.

 

Hey Cutter,  do you have a count on how many Gats you have built so far?    Do you put notches in the workbench leg or something? 

[bruski]

In case if you are wondering, this one makes 6 for me. 3 of them 22\'s, one 9mm, one .223 and the 357 prototype. The 223 uses AR-15 bolts and barrels 3 of them.

 

bruski 

[Cutter]

\"Hey Cutter,  do you have a count on how many Gats you have built so far?\"

 

The model & 357 are 10 & 11

 

My favorite is the 22 lr with stock Ruger parts.

If a builder has all the material needed , it could be fired in about 100 hours

[maccrazy2]

Bruski. Any photos of the .223? It sounds interesting.

[bruski]

maccrazy2,

 

 I made that 223 gat right out of high school 1980 to be exact. It ended up with one of my brothers quite a few years ago and I just didn\'t take any pictures of it back then. It was pretty simple in design with 3 AR-15 barrels with the locking lugs in the extension. The barrels were purchased un-finished so there were no gas holes drilled in them to fill. The barrels were mounted up side down on the barrel plate and the bolt carriers were up side down in the carrier. I broached a square groove for the gas key on the carriers to ride in and keep the lugs on the bolts in the proper position until they seated with the barrel extension lugs and pivoted closed and locked. The stock firing pin was like it came in the carrier to which I added a spring and a long carriage bolt inside and behind the firing pin which would be held back by a cascable plate behind the cam. Just like the D & E type of cocking mechanism. Hopper fed on top and fired on BDC and ejecting about the 9 o-clock position.

 

bruski

[Cutter]

Stopped by a friends shop yesterday, said I need a couple pieces of brass.

“ He says over there help your self “

Scored  ,  1/2 X 2.0 X 6.0   and  3/4 X 4.0 X 5.75

Front Bow & Rear bracket