GTA
All Springer/NP/PCP Air Gun Discussion General => Machine Shop Talk & AG Parts Machining => Engineering- Research & Development => Topic started by: rkr on August 12, 2014, 11:21:06 AM
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I saw a mention of JB testing magnet powered PCP hammers and then ran in to this thread http://www.airgunbbs.com/showthread.php?574635-Worlds-first-magnetic-spring-powered-ratty (http://www.airgunbbs.com/showthread.php?574635-Worlds-first-magnetic-spring-powered-ratty)
What's your take, would it work in a .357 Evanix? I'm having problems finding a spring that's strong and short enough while still fitting in there.
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The is a huge difference between how hard it is to open the valve on a CO2 gun and produce 5-6 FPE (really only a burp required) and on a .357 Evanix.... The idea of using magnets has been discussed before, and the problem is achieving enough travel, as the magnetic force drops off so quickly as the distance between the magnets increases....
The only way I can see this working on a big-bore would be if you have a balanced valve design to remove most of the energy required to open the valve....
Bob
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also a magnet stays magnetized, whereas a spring has give to allow the valve to close. would not a magnet keep the valve open or open longer ?
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I was able to make a successful magnet system (in terms of accuracy retention) on a 12FPE benchrest gun which replaced my solenoid when it was banned from use in the world classes. It performed great......but as Bob said, it becomes impractical very quickly as the need for strike energy increases. I eventually replaced it with a spring and a much lighter striker. There was only so light you could go with the magnet, due to the weight of the magnet itself that had to ride along with the striker.
Mike
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I was able to make a successful magnet system (in terms of accuracy retention) on a 12FPE benchrest gun which replaced my solenoid when it was banned from use in the world classes. It performed great......but as Bob said, it becomes impractical very quickly as the need for strike energy increases. I eventually replaced it with a spring and a much lighter striker. There was only so light you could go with the magnet, due to the weight of the magnet itself that had to ride along with the striker.
Mike
Really, it was banned?
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Yes, the WRABF voted on the issue of rifles with electronics and electronics lost. The spirit of the new rule was to not allow rifles to become able to remove shooter skill in outdoor competitions.....internal computers to adjust for wind, etc. Instead of wording the new rules that way.....they just said no electronics....period. The USARB followed their lead and also baned electronics in Open class, too. So the only two classes that it can be shot in is USA Hybrid, and Unlimited under USARB.
Mike
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Mike,
What about FT. do they have rules against you trigger? I know you were putting together a club and planning on providing some of your designed rifles for up comers. Great idea by the way, the more we have into shooting sports the better off we'll all be.
Bill
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No....it's still legal in FT as far as I know.
I got involved in benchrest to prove out the rifle, and I have been enjoying it so much that I just haven't given FT much thought since.
We have a USARB sanctioned club here that shoots most every Saturday morning. Typically only have 2-4 shooters. More people are becoming interested, though. We have a great place to shoot indoor and out. I usually shoot by myself every day after work......so if anyone wants to join me, let me know.
Mike
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wish that I could, KY is a long way from you. ;D
Idea on the magnetic hammer and only being able to get the weight so low. what if the system had the hammer suspended between two fields? magnet at the valve repulses the magnetic core hammer and the magnet at the RVA end repulsed to act as the spring. The magnet at the valve could be of a field strength that countered the mass of the incoming hammer. The core within the hammer could be adjustable, kinda like the RVA, to change the convergence of the hammer magnet and the valve magnet, thus changing the force as needed. The RVA end could also be adjustable to control the acceleration of the hammer. A perceived quirk would be the fine degree of adjustment. From the aspect of the RVA, what would be full or fractional turns on a spring would be minute with a magnet. what my take 4 turns to change a spring system to a desired performance level may only be 1/4 turn in a magnetic system. might be fun to experiment with though, if someone was so inclined. good quality powerful magnets can be expensive.
Bill
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Mike
is the gun from you that Paul Bendix just posted a pict of on the yellow the new magnetic ?
http://www.network54.com/Forum/79537/message/1409679271/New+Mechaniel+Thomas+arrived+today (http://www.network54.com/Forum/79537/message/1409679271/New+Mechaniel+Thomas+arrived+today)!
(http://i273.photobucket.com/albums/jj235/ModelA_2008/488df39a87f2faa10cf191c9956ab328_zpsaff86db4.jpg)
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Hi Dick,
Actually, all of the new guns are spring. I could not get the striker light enough for my liking with the magnets when shooting HV power. It would shoot accurately, but wasted air.
Mike
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it sure is pretty
even tho Red is not my favorite color ;D
good luck at Joes
Hi Dick,
Actually, all of the new guns are spring. I could not get the striker light enough for my liking with the magnets when shooting HV power. It would shoot accurately, but wasted air.
Mike
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Thanks, Dick. We'll make sure yours is a different color...... ;D
Mike