mcarterbrown.com  

The Dead Zone Paintball Related Chat

Reply
 
Thread Tools Search this Thread
Old 02-19-2013, 06:52 PM   #41 (permalink)
Six Point Five
 
ves206's Avatar
 
Join Date: Sep 2011
Location: joliet illinois

Best way to repolish an older bull barrel ? Not the stanless one
__________________
play pump.......
Fox Paintball. Millington, Il.


http://www.mcarterbrown.com/forums/f...-feedback.html
ves206 is offline   Reply With Quote
Old 02-19-2013, 11:28 PM   #42 (permalink)
Perfection will suffice
 
Menace's Avatar
 
Join Date: Oct 2008

Quote:
Originally Posted by alpha434 View Post
Just do freak inserts... Less work. Everyone has a platform to use it with.
Not quite everyone.
__________________
"Dude. I'm pretty sure he's behind one of those bunkers over there."



My Feedback: http://www.mcarterbrown.com/forums/f...-feedback.html
Menace is offline   Reply With Quote
Old 02-19-2013, 11:41 PM   #43 (permalink)
Banned
 
alpha434's Avatar
 
Join Date: May 2008

AKA Fan
Quote:
Originally Posted by Menace View Post
Not quite everyone.
You would have to pony up to get into the double blind test.

Freak inserts are easier and cheaper to manufacture. Plus, Ty is already tooled to the bone for making them.
alpha434 is offline   Reply With Quote
Old 02-20-2013, 12:50 AM   #44 (permalink)
Brass Monkey Customs
 
tymcneer's Avatar
 
Join Date: Oct 2006
Location: Baltimore MD

Brass N Wood Fan
Kilt Fan
Very true, Alpha.

Ty
__________________

Brass Monkey Customs

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

Still selling brass tubing, with .678 barrel stock now available!

My feedback: MCB - eBay - AO
tymcneer is offline   Reply With Quote
Old 02-20-2013, 01:20 AM   #45 (permalink)
Active Member
 
Rotozip2's Avatar
 
Join Date: Aug 2012
Location: St. Louis

CCM Fan
Just curious on the flex hones, what grit are you using?
Rotozip2 is offline   Reply With Quote
Old 02-20-2013, 10:07 AM   #46 (permalink)
MCB Member
 
agentSmith's Avatar
 
Join Date: Apr 2006
Location: Michigan

Quote:
Originally Posted by Spider! View Post
I think finish will go hand-in-hand with bore size, since most paint is at least a little elliptical at the seam. It only has to be a few thousandths out of round to make major changes in contact surface area with small bore changes. The tighter the bore, the more difference you would see on surface finish.

One of TK's or Glen Palmer's glass barrel videos shows the ball pivoting as it moves down the barrel. As an elliptical ball pivots, the air leakage around the ball varies. I think this is what makes "right bored" barrels less consistent. It's also possible that surface finish reduces the pivoting of the ball in the barrel, resulting in fewer down range changes. Tighter and larger bores would both reduce the amount of pivoting on any finish, but surface finish would also contribute.

I would also expect the coefficient of friction to be different between gelatin and reballs, FS rounds or printed plastic. The reballs should be the worst; the only ones I have seen are rubbery. This has also been a long contention with brass barrels (less friction).

Alpha, if you print any balls, how about a 68 cal whiffle ball? Maybe not as many holes, but it might be fun. Maybe an FS round with whistle fins.
I won't leave in a cloud of confusion if I can help it CJ.

I disagree spider!.
My contention is first that co2 molecules filling irregularities in the finish of the sidewall causes turbulence that slaps the ball around.
My further contention is that when the finish is such that this turbulence doesn't happen or is minimized, that the increased pressure where the ball meets the wall of the barrel will literally center the ball and keep it there. In an overbored barrel .003 to .005 larger than the paint is the optimum zone. With this combination I hit offhand a 120' foot silhouette 48 of 49 shots. With hand picked field paint.

Wait until someone checks for the expected change in velocity as paint diameter changes in the same LA barrel and finds different numbers than they expect by a long shot.

That's the horror of it CJ. Now I have to tell those who care how I take advantage of it.

The best case would be that it's some idiosyncrasy of the way I do it and you'll all laugh and go on about your business.
Bore match matters because of bad finish in my world.

I want to clarify WHY I've been a condescending A-hole through this whole thing.
NOONE. From cockerpunk and bryce to right this minute, has simply asked me to go out and video a LOUSY GROUP.
If what I say contradicts what people think, the only possible explanation is that I'm a liar trying to trick them.

I'm a 47 year old Electrician, who puts his money where his mouth is at one of the biggest fields in the country carrying a pair of pistols.

What possible motivation I would have for such a hoax is beyond me.

People at 250', they are not beyond me. That I know.

Rob
__________________
PISTOLERO:
We play Pistol and we encourage the Few despite the discouragement of the Many.


agentSmith is offline   Reply With Quote
Old 02-20-2013, 03:53 PM   #47 (permalink)
MCB Member
 
agentSmith's Avatar
 
Join Date: Apr 2006
Location: Michigan

Quote:
Originally Posted by Rotozip2 View Post
Just curious on the flex hones, what grit are you using?
Levigated Alumina, extra fine.

Rob
__________________
PISTOLERO:
We play Pistol and we encourage the Few despite the discouragement of the Many.


agentSmith is offline   Reply With Quote
Old 02-20-2013, 04:18 PM   #48 (permalink)
T-T
Active Member
 
Join Date: Nov 2008
Location: East Mids, UK

Rob:
Would you still be interested in a ranged shooting video?

Think I might get in touch with biteweasel and see if he'd be willing to flexhone a beat up TPX barrel... Seeing as he's the only guy in the UK I know with one.
__________________
Quote:
Originally Posted by super_stanchy View Post
i play pump because the electronic triggers hurt my feet (i shoot my toes)
T-T is offline   Reply With Quote
Old 02-22-2013, 12:25 AM   #49 (permalink)
Banned
 
alpha434's Avatar
 
Join Date: May 2008

AKA Fan


Discuss.
alpha434 is offline   Reply With Quote
Old 02-22-2013, 09:45 AM   #50 (permalink)
MCB Member
 
Spider!'s Avatar
 
Join Date: Dec 2008
Location: Houston, TX

Quote:
Originally Posted by alpha434 View Post
Discuss.
I think if you are going to apply a friction factor to the gas flow, you would have to model the gas escaping around the ball, which is no longer very well represented in the diagram except right at the surface. I'm trying to see what you could do with that. The Reynolds numbers will vary all around the projectile, but a model might work.

That reminds me. In pipe flow, you usually consider 10 diameters of pipe as the minimum distance required to establish a stabilized flow pattern. Perhaps that is why 8 inches was the old guideline for minimum barrel length. If you are working with a Moody diagram, I would work out of a Crane's Flow of Fluids.

***

Perhaps your point is that in fluid flow, it doesn't make any difference once the surface gets below a 10(-6) finish?
__________________
My Feedback

Last edited by Spider!; 02-22-2013 at 10:02 AM.
Spider! is offline   Reply With Quote
Reply

  mcarterbrown.com » Paintball » The Dead Zone

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -4. The time now is 05:22 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2015, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO
© MCB Network LLC