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Old 01-02-2005, 11:26 PM #1
amcfall
 
 
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Assault spool

Here's what I did this morning:





Dlerin AF spool with an alumin insert in the back since I wanted to make it very thin and an aliminum front for where it hits the bolt (and there's a bit of wear on the inner bolt face so I see how that would break the lip if it was Delrin). It weighs ~8grams, versus ~14.2 for the stock (no orings). Seems to work at least as well as the aluminum one I made, just need to chrono it tomorrow (and hope it doesn't fall apart after a few cases).
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Old 01-02-2005, 11:44 PM #2
Polish Guy
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Ohh, pretty....I'd like to test one if at all possible.

And yes...three months go by and I'm still trying to get the reciprocating breech for ya.
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Old 01-03-2005, 10:25 AM #3
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I was afraid of that design myself. My nightmare scenierio would be when the alum part goes shooting down the barrel. Although I planned to make one with the alum tip as well by threading the base or core to keep it in place. I have so many spools left over from failed tips this is going to be easy.
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Old 01-03-2005, 10:54 AM #4
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Polish guy-

I'll keep you in mind, if I get time to make another I'll let you know.

Stray-

I can see how it could break off, but I don't think it's going anywhere, since it's larger than the hole in the bolt it would have to blow a hole through the delrin bolt before it could go anywhere. I think it would just break off and rattle around in the breach, don't think it would do anything but possibly damage the internals if it failed. Or am I missing something?
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Old 01-03-2005, 03:25 PM #5
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Nope
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Three round bursts are for people with weak wrists.

Last edited by Stray Bullet : 01-03-2005 at 03:40 PM.
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Old 01-03-2005, 07:31 PM #6
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It could be propelled out of place at 206mph and slice right though your bolt, decapitate your detent, and then richochet out of the barrel with a hefty amount of force behind it.

Then it'll hit someone in the face and cut right through them, so it'll be kinda like a fatality in Mortal Combat, and the guy just drops to his knees while everybody just stares at him in bewilderment (don't think that's a word but whatever).

The End

...Or is it? The sequel could be a lawsuit or something.





wicked and cruel mind of a child have I.
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Old 01-03-2005, 10:07 PM #7
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Heh... That would be no fun, I'd get sued and then they'd take my lathe! Last thing I want is for it to fail in a method that may hurt someone, but a spectacular explosion would bu fun as long as it didn't kill anyone.

Stray Bullet-

Have you been making the thin portion smaller than stock or the same size? I wasn't sure if it would need the al. insert in the back or not, it may be overkill since Delrin is surprisingly strong (BTW, I think it's about .250 or so in diameter at it's smallest).

Avery.
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Old 01-04-2005, 10:55 AM #8
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I was actually making the lip, the part that holds the oring on about 50% thicker. But the trick is to make the diameter smaller. So it begins to fit inside the smaller height from the. Please somebody help, I'm ignorant.

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Last edited by Stray Bullet : 01-04-2005 at 10:58 AM.
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Old 01-05-2005, 01:59 PM #9
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Ahhhh... Interesting. I've been playing around with actually using a (slighgtly) smaller OD lip and (I think one size) smaller oring, I'm trying to avoid the al. face marring up the bolt, I was hoping to have it so the oring always acted as the buffer. When I get some large OK Delrin I'll probably make a new bolt also.Perhaps making it so the bolt back doesn't have so much play in the tubewould help? I don't know.

Quote:
Originally posted by Stray Bullet
.........Please somebody help, I'm ignorant.
Eh? I'm lost now. I hope that's not angry sarcasm, was it something I said?
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Old 01-05-2005, 08:30 PM #10
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Originally posted by Stray Bullet
.........Please somebody help, I'm ignorant.

No sarcasm or anger, just ignorant, really... Wish I knew the techno lingo, that's all.

Already tried it, won't work with a smaller oring . The current oring size was matched to the hole in the bolt. The 90 duro oring is so hard that I doubt it will come off even with the smaller O.D. lip. That's your best bet.

The aluminum insert will work but only if it's threaded and barbed. And it cant go all the way through the spool.
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Last edited by Stray Bullet : 01-05-2005 at 08:40 PM.
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Old 01-06-2005, 03:19 PM #11
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I just make up the lingo as I go. Works for me!

Wish I had some harder orings, but the new one hasn't popped off yet (it probably will, I wonder how long though. The first one I tried (diff size) popped off after about 20 shots. The current one (thick & small) seems to work.... And what an odd whooshing noise it makes without an oring on the tip.

The al. inserts in mine are currently just press fit (very tight, of course). They are two seperate inserts, and unless I'm being crazy (which happens often) the forces they see should just try and drive them further into the delrin.
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Old 01-07-2005, 09:36 AM #12
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Play and post..
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Old 01-10-2005, 08:42 AM #13
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what about lexan, it a plastic so it softer than aluminium but suposedly its really strong
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Old 01-10-2005, 11:59 AM #14
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I'm looking at Nylon MDS. It has a higher degree of chemical resistance.
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Old 01-20-2005, 03:30 PM #15
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Have you thought about using a teflon O-ring. These are much harder and more durable than Nitrile or Buna (rubber) O-rings. You could also get away with a smaller retaining lip on the end of the bolt. Installation of the Teflon O-ring would be a bit tricky though. You would probably have to soak it in HOT water to get it to soften up enough to install. Then let it cool in place. Should fit tight and give a fair seal.
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Old 01-20-2005, 03:39 PM #16
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Would have to be perfect because it was too hard, the body would rip it apart -seen it happen, or it would cause friction.
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