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Old 03-25-2020, 05:22 PM   #11 (permalink)
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I used to file flats where the grooves were. Essentially making the valve circular with three flat surfaces at the depth of each groove... if that makes any sense.

I was using a lighter valve spring, though... something I repurposed from a mechanical pencil or whatever it was.

I also drilled extra holes in the striker and changed the mainspring.

It was running flawlessly on a stock, unadjusted WGP regulator... whatever they came set to back in 2002... didn't have a gauge on it and didn't really care because the number is irrelevant compared to the function.
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Old 03-25-2020, 07:02 PM   #12 (permalink)
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Quote:
Originally Posted by brokeass_baller View Post
I decided not to mess with the valve. Instead i Swiss cheesed the hammer. Lol.

I was just thinking larger passages would equal more air down the barrel, so maybe a rise in velocity and i could tune it to softer springing. But i guess I'll just leave it be for now.
First, how did you mess with the hammer when going for the valve?

As for more air down the barrel, read below
Quote:
Originally Posted by Pyrate Jim View Post
Keep in mind that volume over pressure is equal to pressure over volume.
In other words, one cubic inch of air at 500 psi does the same work as five cubic inches at 100 psi.
So to lower the pressure you need to increase the volume of air used. Just opening up the chamber does little unless you can also keep the valve open longer.
While this statement is true, there is one other factor, flow rate

Most markers change either the volume or pressure of air coming through the valve to change velocity, tippmann blowback does neither. They have a flow restriction downstream of the valve.

So each time the hammer hits the valve, the same pressure and volume of air comes through. Working the air passages helps the flow rate going towards the bolt a little but you still only have the same amount and pressure of air to work with

Changing springs and hammer weight changes the volume of air but it's not something you can do at the field to fine tune that velocity number of course
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Last edited by Trbo323; 03-25-2020 at 10:14 PM.
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Old 03-25-2020, 10:05 PM   #13 (permalink)
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Quote:
Originally Posted by Trbo323 View Post
First, how did you mess with the hammer when going for the valve?
I gave up on the valve when i didn't get the answer i wanted so instead of messing up a good thing, i took inspiration from the Techt Zero Kick hammer and made my own.

https://imgur.com/a/szikY5a

Last edited by brokeass_baller; 03-25-2020 at 10:22 PM.
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Old 03-25-2020, 10:14 PM   #14 (permalink)
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No photo showed up here
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Old 03-25-2020, 10:23 PM   #15 (permalink)
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Edited to show the link instead. Not sure why the img tag isn't working.
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Old 03-25-2020, 10:26 PM   #16 (permalink)
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Random question, did you use any kind of a special drill bit to drill that?
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Old 03-25-2020, 11:18 PM   #17 (permalink)
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Titanium drill bits, and a lot of oil. I started with a punch mark to help keep the pilot bit centered. Then, I began with a ⅛" pilot, then moved up to a ", then lastly a ".
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Old 03-25-2020, 11:19 PM   #18 (permalink)
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The pilot chipped it's way through, even though it had a good edge. But the other bits cut through quite nicely.
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