I plan to leave spring guide alone, but replace original spring with smaller wire spring. And then add bigger diameter spring with counter wound that would use smaller spring as the guide and rest against spring adjustment cap.
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Zbroia Kozak 177 arrived today
- Thread starter shutik
- Start date
I took some measurements and did some calculations, and here is what I came up with:
Original spring is 1.6 inches long, has 0.043 inch wire diameter and 0.26 inch outer diameter.
I've used this calculator https://www.acxesspring.com/spring-calculator.html to calculate spring constant of 32 lb/in
In my 177 12 fpe set up original spring compressed 0.45 inches, which produces 14.4 pounds of energy to the hammer.
Back to the calculator with my smaller 0.037 wire same outer diameter and length spring will give me 16lb/in constant.
My second spring will be shorter 1.2 inch spring with 9 coils and 0.32 inch outer diameter. end cap measure 0.388 inches and has plenty of space to support this second spring.
According to calculator second spring constant will be 13.1 lb/in. Combined constant will be 29.1 lb/in of two springs and I will need to adjust them to get 12fpe power output (about .5 inches compression). Now will try to make these springs.
this is original cap inside end cap adjuster
spring guide back when cocked.
Original spring is 1.6 inches long, has 0.043 inch wire diameter and 0.26 inch outer diameter.
I've used this calculator https://www.acxesspring.com/spring-calculator.html to calculate spring constant of 32 lb/in
In my 177 12 fpe set up original spring compressed 0.45 inches, which produces 14.4 pounds of energy to the hammer.
Back to the calculator with my smaller 0.037 wire same outer diameter and length spring will give me 16lb/in constant.
My second spring will be shorter 1.2 inch spring with 9 coils and 0.32 inch outer diameter. end cap measure 0.388 inches and has plenty of space to support this second spring.
According to calculator second spring constant will be 13.1 lb/in. Combined constant will be 29.1 lb/in of two springs and I will need to adjust them to get 12fpe power output (about .5 inches compression). Now will try to make these springs.
this is original cap inside end cap adjuster
spring guide back when cocked.
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You were right, need to remove guide and modify it, because bigger spring does not fit further down. Thanks for the diagram.
Here are my replacement springs:
Here is close up diagram of the guide https://drive.google.com/open?id=0Bx1ozfIjB-dSaGI5eEFOeHBoMWtnY3hrZXROTVVRR1VKSlpB
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I think there is a similarity in the mechanism of the trigger and the hammer with Raptor3 PCP from Ukraine
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My Zbroia kozak 22 cal stopped indexing the mag , about 600 shots thru the gun, it just quit working tonite, I can see the little arm move upwards when cocking the gun with the mag out , not sure what happened..
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I think the arm bends out. If you go to the TAG forum a guy shows pics of his and the fix I believe said this is a weak spot
Edit to add link-
http://talonairgun.com/forum/viewtopic.php?f=37&t=37388&start=60#p386187
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Roger,
You can ask Tony to send you new part under warranty.
You need to adjust spring preload to prevent this. Too much force from hammer bounce bends the pin.
You can ask Tony to send you new part under warranty.
You need to adjust spring preload to prevent this. Too much force from hammer bounce bends the pin.
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there is not an o-ring on the valve stem to keep the air ( when firing the rifle) from pushing the hammer back, the hammer them hits the little pin that actuates the magazine advance.
when the rifle is ready to fired ,the magazine advance linkage is held solid, so when the hammer bounces back and hits the pin hard, something will break.
Zbroia's fix is to drill a hole in the trigger linkage area to vent the excess air from pushing on the hammer
shutik has a copy of this pdf, mayby he will post it or you can message me and I will forward it to you
it shows location and size to drill
when the rifle is ready to fired ,the magazine advance linkage is held solid, so when the hammer bounces back and hits the pin hard, something will break.
Zbroia's fix is to drill a hole in the trigger linkage area to vent the excess air from pushing on the hammer
shutik has a copy of this pdf, mayby he will post it or you can message me and I will forward it to you
it shows location and size to drill
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I have broken both mag advance pieces in the past
I have drilled the vent hole, as of yet have NO failures
no bent arms, no broken pins after 300 shots
knock on wood
But I can hear more noise in the trigger area,
I also installed a Donnyfl 1/2-20 x 1/2-20 male to male threaded adaptor
and added a LDC much quieter. got a David Furr shorty on its way to replace the no name cheapie LDC
Had a friend with a lathe drill and tap it. I would not try it with a drill press.
to hard to get it perfectly aligned with a drill press, needs to be perfect to prevent pellet clipping
I am all smiles now
I have drilled the vent hole, as of yet have NO failures
no bent arms, no broken pins after 300 shots
knock on wood
But I can hear more noise in the trigger area,
I also installed a Donnyfl 1/2-20 x 1/2-20 male to male threaded adaptor
and added a LDC much quieter. got a David Furr shorty on its way to replace the no name cheapie LDC
Had a friend with a lathe drill and tap it. I would not try it with a drill press.
to hard to get it perfectly aligned with a drill press, needs to be perfect to prevent pellet clipping
I am all smiles now
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Sounds like this platform has a lot of potential . I hope Zbroia can get the bugs worked out.
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I will say that I really liked the Zbroia, when it was working.. it is more accurate than I am , I used to be a way better shot than I am now, but I used to go thru over 500 pellets a week, I will defintly be happy when I get the replacement part ..
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I removed the stock yesterday, to straighten the cocking lever, which is only a very temporary fix , it is very thin , I hope the new ones when they get here, are improved .. anyway I decided to turn the H/S tension down, as it is shootin close to 900 w Jsb 18 .34's so I marked it with a sharpie, & backed it out 2 full turns, & the stock would not go back on with the mounting holes, ( with the H/s tensioner backed out , it was hitting the the wood )so I got a dremel & started removing the wood for the back screw hole to line up, but there is not a lot that can be removed, as it is close to the brass thread , so I ended up turning the H/S back in a 1/2 turn to even get the stock back on , so it l;ooks like I am stuck with the H/S setting that still uses way too much air, but I still like the gun , will like it even better if & when I receive the New cocking lever..
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the vent hole modification is working-put another 500 rounds through it and mag advance system is still working
this is the longest my rifle has worked since I received it. Happy,Happy,Happy
mine is the 22 cal 40 joule compact reg is set to 115 bar and I shorten the hammer spring about 1/4"
shoots 16grain AA 765 fps 60 shots per fill. Could go faster but I wanted it tuned down . great accuracy
this is the longest my rifle has worked since I received it. Happy,Happy,Happy
mine is the 22 cal 40 joule compact reg is set to 115 bar and I shorten the hammer spring about 1/4"
shoots 16grain AA 765 fps 60 shots per fill. Could go faster but I wanted it tuned down . great accuracy
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