Hey gang. Just a quick question here. Not one to really tinker much with factory settings, but here goes. How do I know if I need to change (or WANT TO change) my hammer spring setting on a regulated gun ? I'm thinking of adjusting my reg to give me about 6 ft/lb more energy (going from 24 to 30) and was curious if that would be all I need to change? What clues should I look for if this impacted hammer performance? I'm not that familiar with the correlation and effect each has. Thanks in advance. Have a great weekend !!
Hammer Spring Adjustment
- Thread starter erock
- Start date
More preassure increase on the regulator does not mean more speed.
The valve has to deal with the preassure to be opened, so more preassure does not mean more air to move the pellet/slug. The valve will open less if it had to fight with more preassure.
Try giving clockwise turns to the hammer spring to increase fps and counterclockwise to decrease fps.
What I have said applies to all rifles except LCS, Hubben and Rattler..... On those rifles increase of the regulated pressure and counterclockwise turns to the down wheel will increase air in the chamber to move the pellet/slug.
The valve has to deal with the preassure to be opened, so more preassure does not mean more air to move the pellet/slug. The valve will open less if it had to fight with more preassure.
Try giving clockwise turns to the hammer spring to increase fps and counterclockwise to decrease fps.
What I have said applies to all rifles except LCS, Hubben and Rattler..... On those rifles increase of the regulated pressure and counterclockwise turns to the down wheel will increase air in the chamber to move the pellet/slug.
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I have a crown 177 cal a week old i wanted it to go faster so i went to 110 on the reg speed was 925 so i figured i would go up to 120 on the reg guess what speed went to 780 what the yes i was over airing so i backed off the reg to about 105 then watched the videos about adjusting the hammer spring internal watched the video took it apart no problems they were measuring all kinds of stuff i just took two complete revolutions on the screw which was about 2 mm i guess put it all back together reg at 105 the speed was 965 then i was able to back off on the hammer spring wheel to get what i wanted.
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One of the reasons this happened was the hammer was not strong enough to open the valve with the higher pressure
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If you have an external adjuster for hammer spring tension, it will take only a few minutes to figure out the answer.
Get a baseline
Your current state of tune is delivering 24fpe and you want 30fpe but we don’t know if it’s already maxed out or if it still has something to give. Back off the hammer spring tension (HST) until the velocity begins to drop...the exact amount is not important, just need to be sure it isn’t already maxed out.
Now gradually increase the HST until the velocity no longer increases (the plateau). Once you have the maximum velocity, what you want to do is back down to about 97% of that maximum so it will be at a balanced state of tune, meaning tolerant of slight variations and not wasting air.
Let’s say you find the max to be 820fps, you would back off the HST until the velocity drops to 820 * 0.97 = 795fps.
Make the adjustments
Where do you go from there? You want 30fpe. Where is it currently? If you were using an 18.1gr pellet, the 795fps translates to 25.5fpe.
Going from 25.5fpe to 30fpe represents an increase of about 18% (i.e. 25.5 * 1.18 = 30.1fpe)
Energy is closely proportional to pressure so you would want to increase your regulator’s pressure by about 18%.
With that done, once again gradually dial up the HST until the velocity maxes out. Then dial it back until the velocity falls to about 97% of max. You should be very close to your 30fpe goal.
If you run out of adjustment (can’t cock it because the spring fully compresses and goes to coil bind) before it maxes out, look into a heavier spring. There are multiple other approaches besides a heavier spring but a spring is typically the least invasive.
Get a baseline
Your current state of tune is delivering 24fpe and you want 30fpe but we don’t know if it’s already maxed out or if it still has something to give. Back off the hammer spring tension (HST) until the velocity begins to drop...the exact amount is not important, just need to be sure it isn’t already maxed out.
Now gradually increase the HST until the velocity no longer increases (the plateau). Once you have the maximum velocity, what you want to do is back down to about 97% of that maximum so it will be at a balanced state of tune, meaning tolerant of slight variations and not wasting air.
Let’s say you find the max to be 820fps, you would back off the HST until the velocity drops to 820 * 0.97 = 795fps.
Make the adjustments
Where do you go from there? You want 30fpe. Where is it currently? If you were using an 18.1gr pellet, the 795fps translates to 25.5fpe.
Going from 25.5fpe to 30fpe represents an increase of about 18% (i.e. 25.5 * 1.18 = 30.1fpe)
Energy is closely proportional to pressure so you would want to increase your regulator’s pressure by about 18%.
With that done, once again gradually dial up the HST until the velocity maxes out. Then dial it back until the velocity falls to about 97% of max. You should be very close to your 30fpe goal.
If you run out of adjustment (can’t cock it because the spring fully compresses and goes to coil bind) before it maxes out, look into a heavier spring. There are multiple other approaches besides a heavier spring but a spring is typically the least invasive.
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Your goal is to have a reasonably balanced tune, as described above. At any given reg set point, you want the HST to be in the 95-97% of maximum velocity. That will yield the most efficient use of air.
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Airgun Technology Uragan and Vulcan 2 and 3.
Daystate Renegade HP
Best of the best of the best, Sir….. (as Marine said in Men in Black).
Brocock Bantam (if willing to make improvements).
Daystate Renegade HP
Best of the best of the best, Sir….. (as Marine said in Men in Black).
Brocock Bantam (if willing to make improvements).
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