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Posted: 1/10/2008 3:37:47 PM EDT
| Okay started the demill on my two future builds. Rommy G went fine. Now the Polish UF. The old receiver remnants has already been removed from both trunnions. What is the best way to pop out the rivets on the rear trunnion? I think I need something to support it so I don't bend the trunnion. Or should I nust try to drill out? Any advice would be great. Thanks in advance. |
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This is what I did the other night. soak it in oil, first. Then grind off the "head" so its flat. Then I punched a divet in the center of that rivet. Then I used a drill bit to remove as much rivet as I could from that chamfer on the trunion without cutting into the trunion. Then I used a little nail punch to kind of curl up the rest of the rivet that was against the chamfer. Then I clamped one end of the trunion in a vise, placed a block of wood under the center of the trunion, and whaled on the first rivet with a long, 5/32 punch. Rinse, repeat for the second one. Once I found the right tools (the 5/32 punch) I was able to get the rivets out in about 10 minutes. |
| I drill in the rivet about 7/8 of the way through then I lay the trunnion on a piece of plywood that has a hole driilled in it thats a little bigger than the rivet. I center the rivet of trunnion over the hole in the plywood and start to pound with my 3 lb sledge and a Harbor Freight punch and no more than a minute its out. |
+1 except I didn't have to "pound" with the sledge...just do a light tap. Scrap wood (3/4" plywood, various lengths of 2x4, 2x6) are very good to have lying around... |
| That is exactly what I ended up doing. Now working on the barrel pin. Not fun. Tried vise trick, liquid wrench, pounding with BFH, freezing, did I mention pounding? Anyway have a buddy with an air hammer, and press, bitch is coming out one way or another tonight. |
I have yet to be defeated with some Kroil and my $179 Harbor Freight 20 ton press. And I've done some rusted fucked up super galled pins. 
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| Gotem both tonight. Press just bent the grade 8 bolt. Air hammer just did a center punch on the pin. Sooooo. I took a hex socket and ground the male end of the socket so it was round. Put it into the Cummins Chinese vise with a couple of large washers on the other side. I cranked her down with a cheater, keeping everything straight. Then I took the 3lb. sledge and swung for the fucking fences on the pin side and whalla pins are out. So far the vise has held up fine other than no paint on one side. Amazing how tight these pins are. |
I just popped my pin tonight (that didn't sound right... ) Sprayed it 3x last night with Kroil, left it outside in the shed (temps got down to ~35F), put it in the press.(I also used the "hex bit ground down" tool, started as a 7mm hex socket) That did a great job starting the pin-- "PANG!" was the sound...loud metallic PANG!  The hex bit got it about half way, I used a 1/8" punch to get it the rest of the way out. |
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