FX Crown - How to reset the Hammer Wheel to MAX

[Bob_O]

I'm going to make a few How-To videos this year, as well as some on Shooting Tips.

Here's my first one. I haven't seen one on this topic, and I've read about guys struggling to understand what needs to be done, so I figured I'd make a video on it.

I hope you enjoy!



https://youtu.be/uvTZ4cmYDO4

 

[edosan]

Good tutorial Bob!

Tip: I do not use loctite on that screw basically because I change barrels a lot (Impact X), I use Teflon Tape or PTFE, works good (easy to add and easy to remove). But loctite or ptfe is a must there since it will get loose if you do not add it, affecting the speed (hammer spring),

IMO if you use 1 barrel only, loctite, if you change barrels PTFE (Both work)

 

[edosan]

Here is the marks that you talk in the video (easy fix with just a black sharpie) and ptfe (use black if you do not like the bright neon white! )

 

[Hajimoto]

Nice video Bob! Thanks for scratching up your Crown so we didn't have to LOL

 

[tscktran]

Well done and thank you.

 

[ncrary]

Thanks for the excellent video. As a new Crown owner, I am interested in getting the best out of my gun. What was the performance difference with the hammer spring kit?

 

[allenbowles]

good job bob.

 

[Bob_O]

ncrary,

The power gain was minimal with the 22 caliber and short 500mm barrel. Only 5fps.

I believe this kit is better suited to the 600 and 700mm barrels and 25 and 30 calibers, AND for pressures of 150bar and higher.

However, one big difference with this kit is there is less hammer spring tension required to get the same power. What that translates into is easier cocking, a lighter trigger pull, and a smoother firing cycle.

I went to the range yesterday and shot my first sub-1" 5-shot group at 100yds. Could be just a coincidence.

 

[Bob_O]

Just shot over the Chrono after resetting the hammer wheel.....had to decrease tension by three-quarters of a turn on D5, and matched my previous power pretty closely.

Got 930fps avg, ES 12, SD 3.

About to clean the barrel and go to the range for some more 100yd groups.

 

[douger]

great video works like the impact also im not trying anything just yet as its pretty accurate right how i got it

 

[Centercut]

@bob_o, do you think maybe the heavier hammer would be beneficial in the .22 with 500mm barrel when trying to shoot the .22 JSB RD Monsters at high 800's? I have my .22 Crown shooting the RD Monsters at around 830 to 835, but that's about as fast as I can go, and any reg pressure over 140 gets me nothing. I was thinking the heavy hammer and 150 bar might work to get the 25.4 grain RD monsters going around 880, which could possibly be a very good thing... With the same settings I get for the RD Monsters at 835 FPS, the 18.1 grain JSB Heavies fly at around 960 FPS.

 

[Bob_O]

I also had the 18gr JSB going upper 950s at 150bar.

I had nearly the same experience you have as far as nearly negligible increase in performance above 140bar. I think the factory hammer spring setup is in line with their manual stating not to go above 150bar, as power seems to taper off at 145bar.

I got a 5fps increase in velocity with 21gr pellets and the hammer tune kit.....I maxed it out at 150bar for a high of 905fps.

I believe the kit is to take advantage of pressures higher than 150bar, as the hammer spring has quite a bit if room left for higher tension with the increased preload from the hammer weight.

I didn't try any pressures above 150bar. That said, I'm not sure if the 500mm barrel has enough length to make use of higher reg pressures. I won't seriously consider trying 155bar unless, when my slug liner comes in, the slugs don't stabilize at the velocity I can currently get. 

I think the hammer tune kit will be best put to use on 25 and 30 caliber, or 22 caliber with a 600mm barrel. I'd bet the extra 100mm barrel length would let you tap into some serious velocity with this kit and higher pressures.

 

[22lobber]

It's ashame cause all they have to do is make the TP bigger on the barrel itself that's it.All crowns are the exact same but the .30cal crown can push the 44 grain pellets @870 fps do the math the only difference is the TP on the barrel......

 

[Long_Gun_Dallas]

The TP is actually sized appropriately. But the way air flows across it (and the probe) is not all that efficient. The factory hammer and spring setup on my gun was operating (at max) VERY close to the flow limits of the ports of my 22. Making improvements to the port yielded 60fps without touching the hammer or reg at all. Still factory settings on 380mm barrel. And 75fps on 700mm. I did NOT change the diameter of the port in the middle of it. So, the size wasn't the issue.....



I also have my gun apart a lot, so I do use a tiny amount of silicone grease so my bearings stick to the back of the wheel. Also use the weakest loc tite they make (a tiny amount) on the power wheel screw so it doesn't back out. You don't want that.... I also have an Allen key wrapped in electrical tape so I don't gouge my reciever adjusting the set screw. But, I'll be honest, I havnt adjusted it in months. I have two spring guides, 2 springs, and the 1 weight + shim. Between the two hammer parts sets I can shoot 15 to 65 fpe and anywhere in between without ever adjusting the set screw. I'm not talking about 25 or 30 caliber either. 



I should also note your kit should be 8.25gr for the weight. The one I use is only 7gr. With all the work I've done on my 22, I find it (7gr weight) most efficient at 155bar

 

[swissarmyknife]

New to the forum and wanted to share my tuning experience with my Crown Cont with the 700mm .22 barrel (no slug liner, though it's on it's way ;-)).

I use JSB Beast as the starting point to get the gun dialed in on as heavy of a pellet as possible and used the FX chrony to look for consistency. I increased the reg pressure to about 142Bar and then increased the hammer spring tension until my FPS started to stabilize.

It shoots the 33.9gr beast at about 812fps. Below a 5 shot record highlighted in the graph above



Then I moved on to the JSB exact 18.13gr and played only with the transfer port and the hammer spring wheel from this point forward, looking for good SDV and ES and FPS around 920-930

This is where I found my sweet spot...





My next effort is to work on harmonic tuning now to get a speed that gives me the most repeatable accuracy. But over a range of 150fps my ES stayed below 12 and SDV was on average around 3FPS.

When my slug liner shows up I want to repeat this and possibly increase the reg pressure to 150BAR, but hearing some comments here tells me that I may not get any extra speed out of the 33.9gr pellets without making some mod on the hammer spring. On a side note, I also got a tin of the H&N Piledriver (30gr) and they shoot pretty accurate out of the 700mm pellet barrel, going to be curious how they perform with the slug liner installed.

 

[Tbuggeytom]

I have an early version of the FX Crown, serial # 175891

I have followed the video and set the adjustment screw at 2MM

Had to use HEAT to overcome the Locktite holding it in place (1.5MM Allan Key)

I am trying to get to 860 FPS with the 44.75 Gr. JSB s

With the Power wheel at Max 2MM and the Reg at 145 I am getting only 700FPS checked with FX Radar and Alpha Chrony

ANY Suggestions appreciated 

Thanks

TOM

 

[Tbuggeytom]

Forgot to add it is 30Cal with 600MM Pellet Barrel

Only 30 Cal configuration available at the time I bought it

​​​​​​​TOM

 

[Bob_O]

Did you try different hammer wheel settings.....like 5, A, 4, B, 3, C?

 

[Revoman]

Bob_O

So I'm assuming that you went through each incremental number/letter to determine which shot the best through the chrony. "Best" meaning highest velocity, but had you first shot through the chrony to get the highest velocity by adjusting the hammer spring preload before doing that, or just use the factory settings? Since one can preload the hammer spring to gain (or lose) velocity, I'm just wondering what the preliminary steps were to get to the "MAX" wheel adjustment step.

I know that an answer may not be forthcoming as you could be on the road, so I don't expect an answer right away, but thank you for the video and information so far.

mike

 

[Tbuggeytom]

I bought the Early CROWN from AofA and when they sent it to me they included a target and Chrony print out

44.75 JSBs at 860FPS

I have tried the various power wheel settings with the 2MM extension on the set screw

and have not gotten above 735FPS

all of this was done with the Reg set at 145

Because it is an early version it does not have the AMP regulator and has to be depressurized before trying to

LOWER (Turn Clockwise) the reg pressure

I am about todo that and set the the reg at 120 and begin working up to check the velocities

Is this a GOOD IDEA or should I try something else

Thanks for the come backs and Bob thanks for a GREAT VIDEO I follow you on You Tube and am trying to do a Pigeon at 200YDS

Thanks Again

TOM