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Old 07-01-2016, 07:18 PM   #1
An_Zombie
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Default New "compound" crossbow attempt looking for suggestions

First post and first serious attempt at making a crossbow. Not sure if this counts a a slingshot but I figgured you guys are the people to ask. Recently started working on an idea for a small width pulley crossbow. Just wondering if anyone has ideas for improvements. I have the bones of it complete with a working trigger but I'm not sure how to make the arms move in unison to keep the shot straight. Any thoughts would be appreciated.image.jpg



Last edited by An_Zombie; 07-01-2016 at 08:11 PM. Reason: Acidentaly hit post too early
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Old 07-02-2016, 12:21 AM   #2
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Nice work.


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Old 07-02-2016, 12:42 AM   #3
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What type of trigger system did you use?
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Old 07-02-2016, 06:24 PM   #4
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image.jpg
It's fairly simple but it has a very nice break
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Old 07-02-2016, 06:26 PM   #5
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Oh and that's just to show how it works, normally it's centered in the body of the xbow
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Old 07-02-2016, 09:19 PM   #6
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Nice work. If you could somehow attach the springs on each arm directly to its counter part on the other side I think that they should move in unison( at least im fairly sure I've read that somewhere) feel free to correct me if im wrong
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Old 07-02-2016, 09:27 PM   #7
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Cool, but why is there no introduction?
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Old 07-02-2016, 10:55 PM   #8
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If your referring to the title "New ,," that was my fault. I'm doing this from my phone and accidentally hit post and can't figure out how to fix it
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Old 07-08-2016, 09:39 AM   #9
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The simpler solution would be to make an enclosed arrow guide on top. Look how Jörg has done this with some of his rubber launchers.

These "flipper" designs have individual arms which are individually powered, so even slight differences in construction lead to the arms not moving in perfect unison. Thats just a quirk the designer has to overcome by additional means. somehow there has to be a connection/synchronisation of the arms.
Yours looks very similar to robert van Houses design. http://www.freepatentsonline.com/4169456.pdf. Look what he has done to synchronize the arms. some additional connecting bars which meet at the stock and are riding/guided in a groove there would do the trick.
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Old 07-10-2016, 09:14 AM   #10
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