FX FX Crown mk2 .22 tuning, need help

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pcpSWE

Member
Apr 22, 2024
24
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Sweden
New gun with a 600mm barrel and a silencer.
JSB Exact 15,89

I am new to tuning, and I have watched a lot of YouTube videos, but I am not sure what to do.

First tests with the Chrono, and if it looks like I am far away from all the numbers, I see everyone else has.
This is how I measure the hammerspring, how do you measure so I use the same "standard"?
Help, where do I start? :cry:

2024-06-29_09-07-45.jpg


2024-06-29_09-08-08.jpg
 
Reg pressure too high. Start lower at around 100 bar. Hammer spring dial on max number and start adjusting the hammer spring micro screw up till you max out on velocity. Once you have your max speed for those settings, start bumping up your reg in small increments till you get to 5% higher than your target velocity. Use the hammer dial to back down to your target velocity. I have a dreamline with 500mm barrel and am pushing 18s to 900 fps with barely 110 bar. You are making the valve and hammer work harder at higher reg settings.
 
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Joedirt199 said:
Reg pressure too high. Start lower at around 100 bar. Hammer spring dial on max number and start adjusting the hammer spring micro screw up till you max out on velocity. Once you have your max speed for those settings, start bumping up your reg in small increments till you get to 5% higher than your target velocity. Use the hammer dial to back down to your target velocity. I have a dreamline with 500mm barrel and am pushing 18s to 900 fps with barely 110 bar. You are making the valve and hammer work harder at higher reg settings.
Click to expand...
Wow, what guide can you recomended me to follow for hammerspring reset and adjustments? I am lost now.
 
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Steve at AEAC is the master of tuning videos.

I don't have a numbered hammer dial like yours but I bet the high max is the high number. There is a small allen screw in the slider next to the hammer spring dial that you adjust to give the hammer spring dial more or less spring tension. Set you dial on 24 and take some shots over a chrono, then start tightening that tiny slider screw till your velocity maxs out. Then you can start upping the reg pressure and adjust the slider screw a little to match. What velocity are you aiming for?

You don't have a model that is limited by 12 fpe laws?
 
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Joedirt199 said:

Steve at AEAC is the master of tuning videos.

I don't have a numbered hammer dial like yours but I bet the high max is the high number. There is a small allen screw in the slider next to the hammer spring dial that you adjust to give the hammer spring dial more or less spring tension. Set you dial on 24 and take some shots over a chrono, then start tightening that tiny slider screw till your velocity maxs out. Then you can start upping the reg pressure and adjust the slider screw a little to match. What velocity are you aiming for?

You don't have a model that is limited by 12 fpe laws?
Click to expand...
It is a unlimited version.

And tightening the hammer slider screw is to screw it in right?
 
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Hi,
For those who know me I am going to sound like a broken record - Have a look at Sub12Airgunners You Tube Channel. They have done just about everything that is possible with a Crown. And... they have a very good two-part video on a tuning methodology (using a Crown MkI) that applies to almost any airgun. They are in the UK so they are working with a 12 FPE limit on power, but the methods and procedures apply.

The method you are using for measuring the internal hammer spring adjuster (IHS) won't work because the length you get depends on the Power Wheel setting. I measure the length of the screw extending beyond the carrier to identify a setting (easy to do - just remove the power wheel and you can measure the length you see). Also note that each turn of the IHS causes a 0.5mm change in the compressed length of the hammer spring. Each click on the Power Wheel causes about 0.2mm of change in the hammer spring compression. Both control the same thing, in the same way.

Enjoy the video below.
Cheers,
Greg

 
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NAProf said:
Hi,
For those who know me I am going to sound like a broken record - Have a look at Sub12Airgunners You Tube Channel. They have done just about everything that is possible with a Crown. And... they have a very good two-part video on a tuning methodology (using a Crown MkI) that applies to almost any airgun. They are in the UK so they are working with a 12 FPE limit on power, but the methods and procedures apply.

The method you are using for measuring the internal hammer spring adjuster (IHS) won't work because the length you get depends on the Power Wheel setting. I measure the length of the screw extending beyond the carrier to identify a setting (easy to do - just remove the power wheel and you can measure the length you see). Also note that each turn of the IHS causes a 0.5mm change in the compressed length of the hammer spring. Each click on the Power Wheel causes about 0.2mm of change in the hammer spring compression. Both control the same thing, in the same way.

Enjoy the video below.
Cheers,
Greg

Click to expand...
I have watched it, and I understand more, but it is difficult without seeing the adjustments he is doing.


I found this text and picture helpful in getting it visual.
Turn the Allen key down = clockwise = increase hammer spring tension

2024-06-30_12-39-23.jpg
 
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pcpSWE said:
I have watched it, and I understand more, but it is difficult without seeing the adjustments he is doing.


I found this text and picture helpful in getting it visual.
Turn the Allen key down = clockwise = increase hammer spring tension

View attachment 476339
Click to expand...
NAProf said:
Hi,
For those who know me I am going to sound like a broken record - Have a look at Sub12Airgunners You Tube Channel. They have done just about everything that is possible with a Crown. And... they have a very good two-part video on a tuning methodology (using a Crown MkI) that applies to almost any airgun. They are in the UK so they are working with a 12 FPE limit on power, but the methods and procedures apply.

The method you are using for measuring the internal hammer spring adjuster (IHS) won't work because the length you get depends on the Power Wheel setting. I measure the length of the screw extending beyond the carrier to identify a setting (easy to do - just remove the power wheel and you can measure the length you see). Also note that each turn of the IHS causes a 0.5mm change in the compressed length of the hammer spring. Each click on the Power Wheel causes about 0.2mm of change in the hammer spring compression. Both control the same thing, in the same way.

Enjoy the video below.
Cheers,
Greg

Click to expand...
Forgive this minor hijack please
@NAProf, can you provide a link to the FX SetUp chart in the photo.
I looked the FX website.
Maybe I missed it

Thanksa
Edward
 
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Help me understand.

I started out with 95bar. I follow the instructions as I understand.
2 turns clockwise as shown in the picture above at a time to increase hammer spring tension right?

But after doing this 2 turns at a time, steady increasing velocities it stops, I increase regulator pressure.
Ensure speed goes up.
But at 110 bar, velocities at 705fps, I can not increase hammer spring tension any more. I am maxed out.
The adjuster screw is all the way out. Example picture. On the left is my zero, and to the right is where I end up.
2024-06-30_14-40-40.jpg
 
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SilentSquirrel said:
Forgive this minor hijack please
@NAProf, can you provide a link to the FX SetUp chart in the photo.
I looked the FX website.
Maybe I missed it

Thanksa
Edward
Click to expand...
Is it this one you are asking for?

FX Crown Guide | Airgun Depot

Check out this detailed guide & review of FX Crown from the leading airgun experts, Airgun Depot.
www.airgundepot.com www.airgundepot.com
 
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