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RGG Gatling


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#1 John K

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Posted 19 April 2018 - 11:07 PM

New guy, first post. Received my plans from Paul a week ago, got registered to the board, read/studied everything I could find on the subject and decided to build a non-firing version first. Hopefully, will be able to work out any bugs with aluminum first. Started building CAD models and making chips over the weekend. Finished 10 barrels and front & rear barrel plates. If I can figure out how to post pics I will add them to this thread.
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#2 Cutter

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Posted 20 April 2018 - 12:02 AM

Welcome to the group John

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#3 John K

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Posted 20 April 2018 - 12:05 AM

Thanks, appreciate your help!  Pic posting... can we upload or do we need to host elsewhere?

 

Thanks,



#4 Sparky_NY

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Posted 20 April 2018 - 12:47 AM

Welcome John !      Look forward to following your build. 

 

As for posting pics,  you can upload them right here    When you make a post, in the right corner is a tab "more reply options",  that will show a "attach files" area.


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#5 John K

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Posted 20 April 2018 - 01:04 AM

Attached File  Gat1.jpg   134.56KB   5 downloads

Attached File  Gat3.jpg   128.32KB   2 downloads

Attached File  Gat2.jpg   129.66KB   1 downloads

Attached File  Gat4.jpg   89.15KB   1 downloads

Attached File  Gat5.jpg   111.98KB   1 downloads

Attached File  gat6.jpg   107.17KB   2 downloads

Attached File  gat7.jpg   213.33KB   2 downloads


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#6 John K

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Posted 20 April 2018 - 01:05 AM

That worked - Thanks!


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#7 50BMGBOB

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Posted 20 April 2018 - 01:26 AM

Looks good. I have been working on mine for years. Of course I had never owned a lathe or a mill before I bought the plans so I had a lot to learn and not much time to work on it. I am getting there and I'm about half done. Keep up the post to encourage me to keep at it.
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#8 Sparky_NY

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Posted 20 April 2018 - 11:01 AM

Looks great John !     ( I think you should reconsider and just make it a firing version)   



#9 John K

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Posted 20 April 2018 - 05:26 PM

Thanks Sparky!  Maybe... I would like a display tho.

 

Working on the Bolt Carrier.  The Ejector slot... My ciphering says the "points" on the flats are at 2.103" diameter, and the .150" depth is registered from there, so.. 1.803" diameter for the slot?  Here is a pic of the model with that dimension.  I realize it is just clearance, but that groove looks like it could be a wonderful contributor to jams. 

 

Attached File  Carrier-Block.jpg   55.35KB   2 downloads



#10 drhardin

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Posted 20 April 2018 - 08:05 PM

Looking real good. Is that a Tormach mill you're using?

 

I almost finished mine two years ago and then had some serious health issue. All better now so I am hoping to correct a major problem. Milled part of the barrel away for the extractor and when it fires it occasionally blows the bullet casing out. When that happens it jams the gun , bends the extractor and is a real mess. Will have to cut the barrels off and redo then and make the gun a little shorter.



#11 John K

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Posted 20 April 2018 - 10:30 PM

It is; Tormach 1100 with 6" super spacer 4th axis. Should be able to set your barrels back, depending on your thread relief cut, and rechambering. It is possible to pick up existing threads if you are single pointing in a lathe.

#12 John K

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Posted 20 April 2018 - 10:40 PM

It is; Tormach 1100 with 6" super spacer 4th axis. Using Inventor and Sprutcam.

Should be able to set your barrels back, depending on your thread relief cut, and rechambering. It is possible to pick up existing threads if you are single pointing in a lathe.

#13 John K

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Posted 20 April 2018 - 10:41 PM

Strange, lost a post, retyped it and the first one appeared. Sorry!

#14 drhardin

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Posted 21 April 2018 - 12:37 AM

Sometimes it takes a while for the post to appear. Not sure if the Admin has to approve it or not. 

 

I think I will just cut the barrels off and make the gun .750 shorter. I have a 770 I picked up used a few years ago. Since I am not a machinist it took a while to get it fired up. I am currently using Dolphin because that is what I got with the 770. I want to learn Fusion one of these days. 



#15 John K

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Posted 21 April 2018 - 12:45 AM

Really, really wish the 1100 had a 10k spindle like the 770. Would help a lot with small tools like engravers.

#16 John K

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Posted 25 April 2018 - 11:44 PM

Little more work last weekend. Modeled the bolt carrier and a set of soft Jaws to hold the workpiece vertical. Added a 3/16" pin to index. The idea is to mill one side and then flip to mill the other. In this way, I didn't have to drill the full 3", only about half. Seemed to work fine.

Attached Files


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#17 drhardin

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Posted 26 April 2018 - 12:55 AM

Very nice!


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#18 bruski

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Posted 27 April 2018 - 01:32 AM

Great job John, you might want to consider using a different ejector method which uses a pin pressed in the bottom of each bolt carrier groove under the bolts. This does require machining a slot under each bolt though, but it's a positive ejection on the other hand. Check out this link on the forum. http://www.gatlinggu...357-prototype/ 

Bruski



#19 John K

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Posted 27 April 2018 - 02:46 AM

bruski,

 

Thanks - like that method much better.  Slotting the bolts is doable.  

 

Would like to build a centerfire along those lines one day.  I cast and reload a lot of different calibers so I could feed it easily.



#20 Cutter

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Posted 30 April 2018 - 05:47 PM

Great job John, you might want to consider using a different ejector method which uses a pin pressed in the bottom of each bolt carrier groove under the bolts. This does require machining a slot under each bolt though, but it's a positive ejection on the other hand. Check out this link on the forum. http://www.gatlinggu...357-prototype/ 

Bruski

Sounds a little scary for a rim-fire 

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