 Andrewh 
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Joined: Aug 2001  TX, USA
 Posts: 4611 Feedback: 100% (3) |
Posted: 7/10/2012 5:22:06 PM
THE IMAGE ABOVE IS A PAID ADVERTISEMENT but prior to that, or lets say the first charging of the gun, is it just the tension of the extractor, half moon shape that holds the round in place? or is there something missing in the animation? if that loosens up, is that what causes jams? round drops too far? can't load the first? |
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Circuits
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Joined: Jan 2001 CO, USA
Posts: 6145 Feedback: 100% (21) Link To This Post |
Posted: 7/11/2012 12:54:27 AM
[Last Edit: 7/11/2012 12:54:43 AM by Circuits]
The top cover puts a LOT of downward tension on the claw (half moon as you describe it) and grips the next round tighly in the groove at its base. It's held between the claw and the start of the feed and extraction groove on the bolt face.
About halfway through the counterbattery stroke, the tracks in the sideplate force the claw down, which puts the base of the next round into the feeding and extraction groove. When the downward motion is completed, this forces the extracted empty down and out the bottom of the receiver, and places the new round in line with the chamber to be fed. In the battery stroke, as soon as a good portion of the round is inside the chamber, the tracks in the sideplate force the claw up and off the base of the round, back to the top, where the spring loaded claw can snap over the groove in the base of the next round. |
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Posted: 7/11/2012 10:16:46 AM
ah, I was wondering about that. can't get any good pictures of the bolt face.
so there is still an extractor on the bolt in addition to the claw that grabs the next round? the down force of the claw pushing the new round pushes out the old? what happens when it runs empty? how does the last empty eject? |
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gunz213
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Joined: Aug 2005 TX, USA
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Posted: 7/11/2012 10:24:51 AM
The extractor holds the round in the T slot of the bolt face until the round begins to chamber. As the bolt finishes closing the extractor is cammed up and into position to snap on to the extractor groove of the next round in the belt. When the gun fires and the bolt group begins its rearward travel the fired case is drawn from the chamber by the T slot which grabs the case on the left and right side of the extractor groove. From there the empty case falls straight out of the borrom of the receiver mostly by gravity.
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Posted: 7/11/2012 12:08:24 PM
thanks, that helps my understanding a great deal.
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Circuits
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Joined: Jan 2001 CO, USA
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Posted: 7/11/2012 1:39:48 PM
Originally Posted By Andrewh:
ah, I was wondering about that. can't get any good pictures of the bolt face. so there is still an extractor on the bolt in addition to the claw that grabs the next round? the down force of the claw pushing the new round pushes out the old? what happens when it runs empty? how does the last empty eject? Yes the extractor, with or without a fresh round, pushes the extracted cases down and out. Even with no belt, if you cycle the action, the unfired round should be extracted and ejected. While the "claw" is called an extractor, its function is to extract the round from the belt, not the chamber. Extraction of the chambered round is accomplished by the t-slot on the bolt. |
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Posted: 7/11/2012 4:57:43 PM
[Last Edit: 7/11/2012 5:02:07 PM by Donner_und_Blitzen]
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Posted: 7/11/2012 6:12:12 PM
yeah, that is the animation I was watching. doesn't give enough of a view of the bolt face and how it moves round to round.
Thanks for the info. |
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Posted: 7/11/2012 6:20:10 PM
Need bolt face pictures? Hope these help.....
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Posted: 7/12/2012 1:13:11 AM
Originally Posted By tailo:
Need bolt face pictures? Hope these help..... Wow, thanks tailo. Above and beyond. that is more than I had hoped for and really helps me understand how it works. |
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