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Old 06-29-2014, 06:22 PM   #1 (permalink)
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How far does a valve stem travel once the hammer hits?

I'm working on a new project and need to know how far it travels in an Autococker/Sniper to allow air into the valve. Standard 9/16" valve, as in CCM lower internals.

Thanks!
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Old 06-29-2014, 08:00 PM   #2 (permalink)
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depends on how hard you hit it. If hit hard enough it will bottom out and the hammer will hit the jam nut. Other times it won't. I saw someone post on customcockers that it always bottoms out but I know that's not true. I have a cold fusion body that the ID of the bottom tube is a bit narrower by the jam nut and will cause the hammer to stick if it bottoms out. It operated fine for years before that became an issue.
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Old 06-30-2014, 11:56 PM   #3 (permalink)
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Originally Posted by K_Obeastly View Post
depends on how hard you hit it. If hit hard enough it will bottom out and the hammer will hit the jam nut. Other times it won't. I saw someone post on customcockers that it always bottoms out but I know that's not true. I have a cold fusion body that the ID of the bottom tube is a bit narrower by the jam nut and will cause the hammer to stick if it bottoms out. It operated fine for years before that became an issue.
Thanks, this helps immensely! I didn't know if it can bottom out or not under normal use like in the animations I've seen.
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Old 07-02-2014, 10:44 AM   #4 (permalink)
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little White Out on the valve stem and you should see the wear marks pretty quickly. Meae the valve closed and then to the wear marks.
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Old 07-03-2014, 04:46 PM   #5 (permalink)
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Originally Posted by BSGp8ntball View Post
little White Out on the valve stem and you should see the wear marks pretty quickly. Meae the valve closed and then to the wear marks.
Great idea, thanks!
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Old 07-14-2014, 08:14 PM   #6 (permalink)
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I'm curious if you ever found results in your testing? I have a project and I'm wondering the same question you had. Ever try the white out and get a definitive answer?
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Old 07-16-2014, 06:36 PM   #7 (permalink)
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I'm curious if you ever found results in your testing? I have a project and I'm wondering the same question you had. Ever try the white out and get a definitive answer?
No, I didn't. Since it varies and can bottom out on some setups, I just incorporated that into my design. (It really depends on air pressure, spring strength, hammer weight...)
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