Long Rivet From Hell...VICTORY!!! Post #32

[bigbob76]

I am certain that you are not the first to do what you have done. You are, however, the first that I know of to admit it.

[oogabooga]

I am certain that you are not the first to do what you have done. You are, however, the first that I know of to admit it.

Haha. Thanks...I think
What can I say, I'm shameless on the internets.

[SJgunguy24]

Right now I'm in the Norcal south bay area.

Do you have the trunnion with you? I'm in San Jose and will be home for the rest of the evening. I don't have my shop tools here but I can figure out something to maybe help.

I have steel and a welding machine.

[oogabooga]

Do you have the trunnion with you? I'm in San Jose and will be home for the rest of the evening. I don't have my shop tools here but I can figure out something to maybe help.

I have steel and a welding machine.

Thanks for the offer! I'm a little busy tonight, unfortunately, and I have to get up to report for jury duty early in the morning (this is not my week). But I'm probably going to be in the norcal south bay area for quite a bit of time, anyway, so I might be able to stop by at a later date. What solutions did you have in mind?

[nicoroshi]

I'm kind of liking the rotohammer idea SJGunguy.

[bigbob76]

I've often wondered why people insist on peeling the old receiver section off of the rear trunion. I like leaving it on while I'm removing the old rivets.

[oogabooga]

I've often wondered why people insist on peeling the old receiver section off of the rear trunion. I like leaving it on while I'm removing the old rivets.

Woulda saved my trunnion from getting dinged and scratched.

[Z ME FLY]

We all have been there with those darn pesky long rivets!!

Usually take a little break when things are going right and you will be amazed how things seem to work afterwards.

i.e. drill a little bit, hit it a bit then take a break....

go back at it again then it will probably be easy... haha it's the times when you are having troubles when you REALLY REALLY need a break

[mrlonewolf]

We all have been there with those darn pesky long rivets!!

Usually take a little break when things are going right and you will be amazed how things seem to work afterwards.

Bring it on......

[SJgunguy24]

IMO the key to getting the long rivets is to hide the punches and drill slowly.

[Z ME FLY]

IMO the key to getting the long rivets is to hide the punches and drill slowly.

Then step up in size to slowly drill out the old rivet yeah?

or if you have an air hammer...... that can make things easy from what I am told. I believe the guys @ PRKarms described a method of demilling with the air hammer and they were able to demill kits fast.

[SVT-40]

I think one of your problems is the wood backing plate. Any wood is to soft and will cushion the trunnion so the blows to the rivet will be less effective. Use a thick piece of steel at least 1/4" with a appropriately sized hole to back up the trunnion and allow a place for the rivet and broken punch to fall through. Place the metal plate on the concrete garage floor line up the trunnion with the hole and then give it some good whacks with a new punch and small sledge. Don't try it on your bench as it too will absorb some of the force and cushion the blows.

If you try the above I'll bet you will be able to get the rivet and broken punches pushed out. It's worked for me a few times when a rivet was particularly difficult.

[Z ME FLY]

I think one of your problems is the wood backing plate. Any wood is to soft and will cushion the trunnion so the blows to the rivet will be less effective. Use a thick piece of steel at least 1/4" with a appropriately sized hole to back up the trunnion. Place the metal plate on concrete and then give it some good whacks with a new punch and small sledge. Don't try it on your bench as it too will absorb some of the force and cushion the blows.

If you try the above I'll bet you will be able to get the rivet and broken punches pushed out. It's worked for me a few times when a rivet was particularly difficult.

I found the plates that I got with my HF 12 ton press has a nice size hole for punching rivets.

[oogabooga]

I think one of your problems is the wood backing plate. Any wood is to soft and will cushion the trunnion so the blows to the rivet will be less effective. Use a thick piece of steel at least 1/4" with a appropriately sized hole to back up the trunnion and allow a place for the rivet and broken punch to fall through. Place the metal plate on the concrete garage floor line up the trunnion with the hole and then give it some good whacks with a new punch and small sledge. Don't try it on your bench as it too will absorb some of the force and cushion the blows.

If you try the above I'll bet you will be able to get the rivet and broken punches pushed out. It's worked for me a few times when a rivet was particularly difficult.

I have tried pounding on the concrete garage floor, and it does transfer a significantly larger amount of the blow into the rivet. But this made the punches bend and snap a lot faster. I do have some 1/4" steel flat I can use to do the method you described above. I think another problem is that I did try using a new punch to punch out all the junk inside the rivet hole, but the punch tip has now mushroomed. This can cause the punch to get stuck inside the trunnion as the mushroomed tip seals itself against the walls of the trunnion hole. This is why I believe the current broken pieces of punch won't come out so easily. Should I continue anyways?

[SJgunguy24]

Then step up in size to slowly drill out the old rivet yeah?

or if you have an air hammer...... that can make things easy from what I am told. I believe the guys @ PRKarms described a method of demilling with the air hammer and they were able to demill kits fast.

Yep, start with 1/8" then 5/32" and if needed 11/64". Usally the 5/32" will get the rivet to spin right out. Go at the rivet from both sides and slowly.

The air hammer is for the barrels and that needs a couple of special tools that need to be made. I don't have the cash to shell out for the brass to make them at the moment. I can have a kit demilled (intact barrel) in maybe 20-30 minutes, if I gotta mess with barrel parts then the time increases do to the special jigs involved.