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Discussion Starter #1
Hi All,

My buddy and I were cleaning up an RTG cocking tube...

we got the tube off and cleaned up with an end mill and a dremel. Turned out great

Now I have the trunion with a cut off barrel in it... How can I remove the barrel pin? would it be easiest with a hydralic press?

What type of drift or punch do you all recommend...

My first attempt I chucked it into a vise and applied force with an arbor press... the arbor press gave enough force to start flexing the punch I was using...

Any suggestions?

LO
 

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Search the Member's Gallery Forum; recently JFK posted something about how he drilled the barrel pin out, then used a punch to remove the remaing portion of the pin. Don't remember exactly which post it was, but it was not too long ago.
 

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Search the Member's Gallery Forum; recently JFK posted something about how he drilled the barrel pin out, then used a punch to remove the remaing portion of the pin. Don't remeber exactly which post it was, but it was not too long ago.
You can chuck the trunion into a drill press vice and use a carbide end mill (1/8, 3/32, or 3/16, if you're careful enough to have it centered) to mill it out. Once the pin has been drilled, you can use a punch to take the hollowed portion out with a simple punch. By using an undersized end mill, you prevent the trunion from being damaged.
 

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The barrel pin is 5mm. I use a 3/16" end mill (CARBIDE). The pin is very hard. You will not get it to budge with a drill bit, especially HSS (high speed steel) or colbalt. Just make sure the carbide end mill is centered when drilling. There will be a hollowed out piece from the remainder of the pin which comes out easily.
 

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Hi All,

My buddy and I were cleaning up an RTG cocking tube...

we got the tube off and cleaned up with an end mill and a dremel. Turned out great

Now I have the trunion with a cut off barrel in it... How can I remove the barrel pin? would it be easiest with a hydralic press?

What type of drift or punch do you all recommend...

My first attempt I chucked it into a vise and applied force with an arbor press... the arbor press gave enough force to start flexing the punch I was using...

Any suggestions?

LO
Use a shorter punch.

But from what I've read, an arbor press isn't going to cut it anyhow.
 

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Discussion Starter #8
I took the remaining sheet metal off the trunnion. I used a center cut endmill and a dremel. So now I am down to the trunnion and a cuttoff junk barrel.

I used a bench grinder to knock the welds down.

Now I can get it square in the mill vise.... I will give it a try... Carbide only huh... HSS is all I have on a sunday!


Thanks men...

LO



Just to let you all know...

I have a 2nd RTG cocking tube... these are in great condition... the cocking lever has almost no wear marks on the metal.. The first one w dismantled had a green handle that is a little discolored looking... The 2nd is perfect! The trunnions and cocking tube metal are all in great shape. Ww have beeb scheing bolt gaps with a few different bolt assemblies.. the trunnions are comparing favorable to the best ones we have.
 

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Discussion Starter #9
Oh Yeah... I tried a short punch and a hydraulic press yesterday. I could not get it chucked well enough I guess... also the press was a POS.
 

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If they are too tight to press out, how are the replacements pressed in?
It's possible to get the barrel pin out without milling/drilling. I was able to get a barrel pin out with the help of a friend. We had to place the gun on a piece of wood and beat the crap out of the pin with a dead blow hammer, after heating the area with a torch.

This was alot of work which I really did not like doing. I'm thinking the barrel pin is easier to install because I can tap it in with a hammer and the rest can go flush with a pin punch.

I have a 12 ton hydraulic press but I don't have a jig the place the receiver in. The bottom of the press wobbles and isn't steady to use to press the pin back in.
 
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