Lets talk about brech materials

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  • #539
    bodhisdad
    Participant

    Stock AF rig comes with the delrin brech. Plenty of Ali or brass ones available. Any one test a stock one against a ali or brass one to see if the delrin is absorbing some of the hammer impact? Just a thought i had about plastics. I’ll admit i don’t know much about the physical properties of Delrin, its soft and to me would seem like it would absorb some of the blow. It’s about shockwaves, basicly i have plastic hammers made for stone tilesetting a little tap, tap, and the tile sets nice if one tried this with a steel/iron hammer the tile would crack.. Anyone reading this should know what i mean. I have this thought that a metal brech will transfer the impact from the hammer more effectively than the delrin one. I have a Ali one i will test against the delrin one and post when i can. If anyone has already done this then let me know.

    #25717
    benzin
    Participant

    Just a tought…
    maybe its better to just transfer the “push” to the valve and not the shockwave? like in your analogy of the tile and the plastic hammer, we want to push the tile into place, we dont need to “shock it” at all.
    Maybe transfering the shock to the skinny valve tophat-stem would put them at risk of breaking?. After all, what we really want is to “push” the valve open, and a sharper blow might damage (at least) the threads on the tophat?

    #25747
    bodhisdad
    Participant

    Benzin i follow your thinking, i’ll say this my ali brech is lighter than my delrin one. The area of the base of the tophat takes up much of this shockwave shearing i don’t see as an issue. We got guys using 120g hammers on the old condor valves with no issues. With the delrin i don’t see 100% of the energy from the hammer getting to the tophat. I will test this sometime soon. Full fills and and 2 strings its worth it just for arguements sake. If i gained say 20fps with the lighter ali brech i’d say it’d be worth the time. Then i have to consider the physics of ali vs. brass which another here would have to comment on as i know not a thing about the two. The Plastic hammer thing was an anolgy and can’t be taken literaly, i’m speaking purely on the lines of energy transferance. If your ever at the home improvement store take plastic hammer and a steel one and tap them on the floor, better yet try and drive a nail. I have been cuttting granite the last few weeks and have learned about energy transference. Vibrations or bounce is no good, trying to cut a stone on the planks we work on. A dead blow is best for transfering energy, hence i made some sandbags which take up the bounce and vibrations.

    #26042
    kujitsu
    Participant

    with a lighter breech you could see a change in hammer rebound. im not sure if it would be better, but the valve time will be shorter.

    btw- im still looking for stronger spring, and my damn aluminium hammer doesnt work anymore…

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