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Jack Wood

Member Since 07 Oct 2008
Offline Last Active Mar 12 2013 07:18 AM
*****

Posts I've Made

In Topic: brittle paint shooting

28 May 2012 - 04:40 AM


so how abuot i get the temp down to aruond 0C. turney grade paint will get brithle as hell.


That's what Jack @ Plant Eclipse does when he's trying to get guns to break paint.


Correct. We get the most fragile/bad paint that the distributors have and then chill it. The problem with shooting High Speed Video is that you need so much light that the paint gets soft very quickly under the lamps needed to shoot full frame high speed stuff.

In Topic: Punkworks posters - a call to test

19 April 2012 - 05:32 AM

ah, you are implying that the bolt itself rotates about the hammer/valve stem point which directs air at an angle .... mmmmm. so can you possible manipulate that with the fit and length of the bolt? that would be the test there.

so why then would we see bouncing on a gun like the AXE that lurker sees? that screams airflow to me, that the AXE volume near the poppet isn't enough, and it taps into the gas transfer tube in the frame, which gives it a pressure differential across the bolt face, and thus a bounce.


Actually the cup in the face of the boltdipping down pushes the ball to the bottom of the barrel prior to the pulse hitting the ball. The gas then exploits this positioning of the ball.

As to why you would see it in the Axe, well maybe the spring is causing a tipping actionas it compresses?

The detents don't have any effect on the ball being loaded into the barrel. Certainly our rubber finger detents do nothing at all compared to the loading and firing forces involved.

In Topic: Punkworks posters - a call to test

18 April 2012 - 08:09 AM

That's interesting, but wouldn't TK have been testing with Mags?


And where did Tom say he saw the bounces?

In Topic: Punkworks posters - a call to test

17 April 2012 - 04:37 AM


Humidity or condensation may play a part in how well the powder adheres to the inside of the barrel. How about breathing through the barrel first and then pouring the powder through?

Regarding bounce initiation, we can see it clearly when using a poppet based gun. I haven't revealed the cause of the initial instability so far. I was hoping someone would try and work it out :)

Jack


its got to be either differential in power pulse pressure, or non centering of the ball in the breach/loading.

or both?

loading/non centering would probably lead to even spool valves doing it, which i dont think is the case.

means its got to be a differential in power pulse pressure.


Remember when I showed you the very first HSV footage all those years ago? Remember the "negative" kick we saw? Well a cup faced bolt that is pushing a ball into the barrel on a poppet gun undergoes the same phenomena. Where does a bolt pivot around when the rammer strikes the poppet valve? What would the resultant be when that happens?

It's easy to assume that the bolt has only one degree of freedom as it cycles, but that would be incorrect.

In Topic: Punkworks posters - a call to test

16 April 2012 - 12:02 PM

Humidity or condensation may play a part in how well the powder adheres to the inside of the barrel. How about breathing through the barrel first and then pouring the powder through?

Regarding bounce initiation, we can see it clearly when using a poppet based gun. I haven't revealed the cause of the initial instability so far. I was hoping someone would try and work it out :)

Jack