hammer main spring to hammer weight formula?

[Bug Splat]

I've been tricking out CZ97b to just smash any 1911 I come across. It already can but I want to destroy anyone who steps in the lane next to me

I have completely reworked the trigger, hammer, sear and all the part in between making it a SAO. The firing pin block is history too. The trigger is just superb now with zero creep and a very short reset Replaced the recoil spring some time ago to 16# which helps it cycle smoothly and I just ordered a new stock firing pin spring and a 13# hammer spring which I think now might be too light for the CCI primers I load.

My question is if I lower the spring pounds how much weight do I need to add to the hammer to equal the same force on the primer? There is a nice round hole in the hammer that is just calling for brass insert.

[Bug Splat]

Well, I installed the new springs and worked on the hammer and sear. Trigger is breaking at a nice 2.5#. Loaded up some brass with just primers and tested it. Good news is the primers did go off but just barely. I'm kinda surprised because the dimple is tiny. More weight is surely needed in the hammer. Now how much?

Had any idea of of plugging one side of the hammer hole and pour melted solider inside. It would harden and leave a perfect fitting plug. Has anyone tried this?

[Steelplate45]

No, we only use Glocks and

1911's.

[kcstott]

To heavy a hammer will increase your lock time. Slightly but it will increase

[GSwain]

I don't have any experience with CZ's, but that is a nice looking pistol. You stated there is a hole in the hammer that you could put a brass weight in, so I am assuming that is your plan. Why not get a few different sized pieces of lead shot, and try different weights with some electrical tape to hold the piece of shot in the hammer hole for added weight? That way you can figure out what will work best for the function you want.

Other than that, the only thing I can figure is you can do a calculation for primer strike force required based on existing measurements of something else, for example a 1911 hammer/spring assembly. I know it would be possible to figure out exactly what spring weight or hammer weight would be needed, but frankly, my math isnt that good :P

[ojisan]

Often overlooked in discussions of springs is preload...the distance that the spring is compressed when it is in its installed position.
Reducing preload is an easy way to get a lighter trigger pull, even with the exact same spring rate.
However, not enough preload will cause soggy and slow hammer and / or trigger return action.
Springs are actually complex little guys...overall length, installed / preloaded length and stiffness rate are all interrelated.
Example: you can shorten a spring to reduce its preload length, but the shorter the spring (the less coils for the same material diameter) the stiffer it gets.

[wash]

Kinetic energy is 1/2 m(v^2) and increasing the mass of your hammer will decrease it's speed which means that lighter might actually be better if you want to keep that mainspring.

It's the same idea as an AR15 speed hammer, you use a light hammer spring but cut the tail off of your hammer to make up for it.

[Bug Splat]

I'm not sure going lighter is the right call. Seems that everyone who is using a lighter mainspring compensates by adding more weight to the hammer.

[wash]

Well plug the hammer with a brass weight and see what happens.

If the primer strikes are lighter, you've gone the wrong way.