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blow forward bolt

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blow forward bolt

Unread postAuthor: suture self » Mon Feb 16, 2009 10:32 am

ok, this one has probably been done before so go easy on me if so, i would like to build this one if you guys think it would work let me know if you see anything wrong with it, other than the cheesy stock i added in paint :lol:
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auto bolt 2.JPG
this is the mechanism in the open (firing) position, you can see the "bolt return line" filling with air
auto bolt 2.JPG (27.85 KiB) Viewed 2175 times

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Unread postAuthor: jackssmirkingrevenge » Mon Feb 16, 2009 10:49 am

The "bolt return line" is a waste of air, why not just use a spring?
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Unread postAuthor: john bunsenburner » Mon Feb 16, 2009 10:50 am

Your diagram is a little unclear, leave out color when its not nessasary...
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Unread postAuthor: SpudsMcGee » Mon Feb 16, 2009 12:33 pm

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Unread postAuthor: suture self » Mon Feb 16, 2009 1:48 pm

JSR, shoulda mentioned but i'm going for full auto do you think this would cycle? :? maybe i should just scrap the idea, i know how everyone fells about spoonfeeding :P but maybe you could just save me some prototyping and point me in the direction of a good auto bolt design ::worthy:: :D [/quote]
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Unread postAuthor: jackssmirkingrevenge » Mon Feb 16, 2009 3:11 pm

suture self wrote:maybe you could just save me some prototyping and point me in the direction of a good auto bolt design


The blow forward bolt can be made to cycle alone, have a look at this - but in my experience, this happens at a cycling rate so high that feeding ammunition is practcally impossible, not to mention the fiddliness of tuning the system. The bolt has to be combined with some sort of valve which "pulses" the air supply in order to be successful.

From what I've seen, the way this can be achieved without including some sort of externally powered electric/mechanical system is either using a pop-off piloted piston, or a pop-off valve directly, looks like you have some more research to do ;)
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