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Post by mmike956 on Mar 15, 2011 16:21:18 GMT 1
Here's a poor man's way of making a trunnion. That's a HB barrel stub posing to illustrate the idea. The trunnion area is a real bugger to reproduce. Basically you want the barrel aligned first then worry about cosmetic details. In the upper part of the photo you can see another trunnion idea. It's solid and I've abandoned it for now but the concept is usable.  |
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Post by mmike956 on Mar 15, 2011 16:35:35 GMT 1
You can also see how the top and bottom plate flanges overhang the sideplates 3/16ths" to provide a shelf for fitting up the top and bottom plate sheets. It can get real testy if you don't have some spacer blocks and clamps. Internal ID should be 1.985" if you use 3/16ths" plate. Remember to weld a denial island to the rear area of the side plates before you finish shaping the form. The ATF counciled me on this point right before they permitted me to weld my bolt shut. I called them to inspect my replica for compliance before I turned it loose to a buyer and they did come out and look at it. It was in violation because of the rear plate thickness and so were seven other plates I had ready. They were very helpful and allowed me to fix the problem while they waited and it turned out fine. I'm light a few side plates now but I'll start over with a new approach. My advice is to be careful with side plates even though our replicas would never be able to chamber or fire, they could be in violation just the same. I guess I've taken up enough space here for one day. Let me know if I can help.
Mike
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Post by mmike956 on Mar 20, 2011 14:09:05 GMT 1
Here are a few pictures of a demil trunnion I will attempt to restore to use on a replica. As you can see it will be quite a task. The barrel support threads are in excellent shape and the front sight area is good so the rest will be hidden under the side plates. Alot will be cut away and replaced with thin sheet metal.  |
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Post by mmike956 on Mar 20, 2011 14:09:33 GMT 1
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Post by mmike956 on Mar 20, 2011 14:10:04 GMT 1
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Post by mmike956 on Mar 20, 2011 14:12:05 GMT 1
The trunnion is a tough piece of steel. I heated it up red hot and could finally make the hard metal yield a bit. I decided to save my energy and start cutting away the offending metal.  |
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Post by mmike956 on Mar 20, 2011 14:14:33 GMT 1
Here are some of the pieces that were cut away. The botton trunnion leg will be easy to replace with 1/4X1" flat bar. the top of the barrel channel won't be as easy.  |
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Post by mmike956 on Mar 20, 2011 21:34:03 GMT 1
This trunnion required alot of cutting to make it limber enough to get straight.  |
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Post by mmike956 on Mar 20, 2011 21:34:29 GMT 1
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Post by mmike956 on Mar 20, 2011 21:34:48 GMT 1
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Post by mmike956 on Mar 20, 2011 21:37:31 GMT 1
Now the real work begins. reproducing the top trunnion plate that all those cartridges pass over. Thankfully most of the cut away areas are not visible after assy. Replica building this way is a disease of sorts I think, or I've been told!
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Post by mmike956 on Mar 26, 2011 11:59:00 GMT 1
Here's what happens when you use too much pressure setting rivets with the press.  |
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Post by mmike956 on Mar 26, 2011 12:01:37 GMT 1
It's a crying shame to mistreat a pawl bracket this way and I'm disappointed in my "ham handed" use of the press. One step forward and two steps backward. The bracket is now repaired but I won't soon forget the folly.  |
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Post by mmike956 on Mar 27, 2011 0:31:18 GMT 1
 Denial island is visible on inside of right hand side plate. |
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Post by mmike956 on Mar 27, 2011 0:33:32 GMT 1
 The trunnion had to lose a few more chunks before the barrel and support would fit up with barrel. There was a slight alignment problem. |
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