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Old 02-01-2013, 10:25 PM   #11 (permalink)
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I have seen some discussions about the hammerheads bore(688) might encourage the fsr to spin.I have pushed fsr's through it (colored) and it gets 1/2 a rotation.The lapco rifled barrel was said to have been extensivly tested.What we do know is that there can be some inconsistances do to the tight bore (683)I never ran test on mine I sold it and bought a hammerhead.In my opinon the hammerhead works.I guess we will not know for sure till we some slow mo video and someone does the test it's out of reach for me financially.
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Old 02-01-2013, 11:21 PM   #12 (permalink)
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Problem: Rotational acceleration. (Challenges the shear strength of the fins.)

Solution 1: Slower rifle rate... Don't expect 100% rotational speed on barrel exit.

Solution 2: Variable rifle rate.


I'm in... Let's do this.
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Old 02-01-2013, 11:25 PM   #13 (permalink)
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Originally Posted by tymcneer View Post
The next major investment is likely to be a CNC rifling machine, so I can build test barrels.
Sounds like another special on brass inserts
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Old 02-01-2013, 11:29 PM   #14 (permalink)
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Quote:
Originally Posted by tymcneer View Post
The next major investment is likely to be a CNC rifling machine, so I can build test barrels.
Sounds like another special on brass inserts

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Originally Posted by uv_halo View Post
Well, when it comes to accuracy, I rely on indoor testing in order to better separate the 'signal' (improvement in accuracy) from the 'noise' (0-3mph drafts that we cannot necessarily feel but, will drift rounds).

Dual Chrono tests can be done outdoors with the optical chronos, as long as we can reliably determine that we've got a crosswind vs a tail or headwind.

Bryce and Cockerpunk will be testing one or both of these aspects soon. So, if they knockout accuracy, I would help with the dual chrono test if it was needed.
I can bring the ultrasonic and mechanical wind sensors to place along the range to verify wind speed and direction.

I have also recently found a possible indoor range that is about 150' long. (I had no idea one of my local paintball fields had an indoor speed ball field.)
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Old 02-01-2013, 11:44 PM   #15 (permalink)
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This type of rifling can easily be done on most cnc lathes.
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Old 02-01-2013, 11:52 PM   #16 (permalink)
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Problem: Rotational acceleration. (Challenges the shear strength of the fins.)

Solution 1: Slower rifle rate... Don't expect 100% rotational speed on barrel exit.

Solution 2: Variable rifle rate.


I'm in... Let's do this.
The rnd is designed to catch the air and spin it when it exits the barrel.Rifling would start the process.Like giving it a push start.I do know that a few rnds have broken up on exit from the barrel(not a barrel break).I think it's old fsr's or they have been stored poorly.
http://www.youtube.com/watch?v=Vg60L9EePJk&list=UUasIJd4sboqTz1UFVr-zWuw&index=12
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Old 02-02-2013, 03:51 AM   #17 (permalink)
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I'm not confused on how the round works, Casper.

I'm confused about what's going to happen when you try to put mechanical force on those fins while you're accelerating that round up to 300 fps.

Air is soft. Aluminum is hard. Fins are fragile. Machinework is expensive.


Ty... How about 3d printing a barrel sample? Whatever pattern you want.
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Old 02-02-2013, 03:56 AM   #18 (permalink)
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I'm not sure about the 3d printed sample. The issue, I believe, is the fins are *NOT* what the rifling is engaging, as they are the same od as the waist of the round. Think teardrop with the tail cut off for the main body, with the fins making up the distance from the main body to the .685ish waist.

I want to make the rifling sharp enough to engage the waist of the round, without causing too much shear.

Ty
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Brass Freak compatible and Equation inserts in .665, .670, .675, .678, .680 and .685

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.665 = 0, .670 = 16, .675 = 3, .678 = 4, .680 = 4, .682 = 4, .685 = 11

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Old 02-02-2013, 04:02 AM   #19 (permalink)
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Do certain bore sizes work better with certain guns?

Lapco did extensive testing to come up with the .683, but that is on a tib system.

Is that the best for a sheridan?
Or a non tpc'ed high pressure nelson?
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Old 02-02-2013, 04:20 AM   #20 (permalink)
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I'm not sure about the 3d printed sample. The issue, I believe, is the fins are *NOT* what the rifling is engaging, as they are the same od as the waist of the round. Think teardrop with the tail cut off for the main body, with the fins making up the distance from the main body to the .685ish waist.

I want to make the rifling sharp enough to engage the waist of the round, without causing too much shear.

Ty
Ah. That's an interesting point.

And the plot thickens.
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