This isn't off-topic anymore! (was: Have YOU got a metal lathe and know how to use it?)

m102404 · July 31st, 2009, 10:34

Internet guessing at it's best...LOL

I made them out of brass.....drumroll....because I happened to have a piece of scrap brass round stock that fit the bill. Nothing more precise or premeditated than that.

If the piece happened to be aluminum...I would have used that (although the stuff I have is kind of "sticky"...and tends to gall). Etc....for steel.

DonP · July 31st, 2009, 12:06

Quote:

Originally Posted by Armedsask

So if they are for molding BBs, why did they have to be brass?

Didn't have to be brass. My spec was "whatever" (but metal).

Well, okay I did maybe in fact state I 'preferred' brass but only because it's the same material as the other part I was using and I refuse to learn new things.

DonP · August 4th, 2009, 14:45

Did some tests - they were not encouraging, but not horrible either.

I used a Maruzen APS2 with no hop-up. 90 foot range.

The custom ammo grouped worse than any regular BB (tested against Intruder Shop 0.28, Madbull precision 0.28, and Straight 0.43).

Good news is that the ammo wasn't tumbling when it hit paper, and the recovered ammo was still in one piece (didn't break apart).

I'd like to try with a rifled barrel if I can get my hands on one.

Thenooblord · August 4th, 2009, 15:00

the problems is that a normal BB gets its stability from the backspin, that this BB cant get

Dracheous · August 4th, 2009, 15:42

Quote:

Originally Posted by Thenooblord

the problems is that a normal BB gets its stability from the backspin, that this BB cant get

Which is why he's already stated he'd like to get his hands on a rifled barrel.

Kimbo · August 4th, 2009, 15:59

How bout stamping or grooving rifling on the projectile maybe.

Dracheous · August 4th, 2009, 16:12

Quote:

Originally Posted by Kimbo

How bout stamping or grooving rifling on the projectile maybe.

At the projectiles weight, it would be more likely to cause the thing to tumble; still worth a shot I suppose.

DonP · August 4th, 2009, 17:51

No idea how I would reliably/repeatedly mold rifling marks (like on a shotgun slug) into these things, but one way or another it can probably be done.

Maybe a tanio koba twist barrel would do the trick, but it's not "real" rifling really.

Quote:

Originally Posted by thenooblord

the problems is that a normal BB gets its stability from the backspin, that this BB cant get

All tests were with no hop-up applied to the regular BBs. They still grouped better.

.28 Intruder Shop BBs highlighted

.28 Mad Bull "Precision" BBs :roll: highlighted

.43 Straight BBs highlighted

.48 Custom rounds highlighted
(Note that it's almost two "groups" - possibly irregularities in molding them...? Either way it's clearly worse.)

Bissa · August 4th, 2009, 18:14

If it is no longer off topic, why is it still here? couldent it be moved to general?
also this looks like it should be interesting to see that the final product is

Thenooblord · August 4th, 2009, 18:16

try instead of a cup design on the back, maybe fins, like shotgun dart slugs, if the TK twist doesnt work

Tankdude · August 4th, 2009, 18:17

figure out your twist rate first.

there are a few calibers in the correct size, but they won't be cheap or practical at this point.

best way would be to get a button made to your spec and apply it to an inner barrel.

DonP · August 4th, 2009, 18:39

Oh, if a twist barrel doesn't do the trick (and I am not sure it will) then I will consider this particular experiment to have run its course. I have no interest in, oh, button-rifling my own custom barrel blanks. I am an extremely lazy man after all and that sounds not only like work but also suspiciously like I would have to learn new things.

Thenooblord · August 4th, 2009, 18:47

lol, man after my own heart

Danke · November 11th, 2009, 13:22

So is this project dead?

As an aside the TK barrels just create a cushion to float the BB down the barrel, no spin. It wouldn't seem like they're bouncing since there are no keyholes.

That said I have a MGC pistol with a twist barrel and no hop. If you want to keep testing you can mail me a few and I'll setup a bench and fire a few groups.

DonP · November 13th, 2009, 18:22

I haven't been able to get my hands on an actual rifled barrel (and am not likely to) so nothing else has happened.

Interesting side note is that I tried firing just the "tail" of the custom rounds (which look like a cylinder with a cone-tip on the front and an inverted cone on the rear) and they flew EVERYWHERE. Like way off course even 20-30 feet out from the muzzle. They must flip and tumble like mad all by themselves.

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November 11th, 2009, 13:22	#44
Danke Prancercise Guru Trader rating Join Date: Oct 2007 Location: Danger Zone	So is this project dead? As an aside the TK barrels just create a cushion to float the BB down the barrel, no spin. It wouldn't seem like they're bouncing since there are no keyholes. That said I have a MGC pistol with a twist barrel and no hop. If you want to keep testing you can mail me a few and I'll setup a bench and fire a few groups. __________________ Airsoft, where nothing is hurt but feelings. Last edited by Danke; November 12th, 2009 at 11:47..

July 31st, 2009, 10:34	#31
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	Internet guessing at it's best...LOL I made them out of brass.....drumroll....because I happened to have a piece of scrap brass round stock that fit the bill. Nothing more precise or premeditated than that. If the piece happened to be aluminum...I would have used that (although the stuff I have is kind of "sticky"...and tends to gall). Etc....for steel.

August 4th, 2009, 14:45	#33
DonP Trader rating Join Date: Jul 2002 Location: Edmonton, AB	Did some tests - they were not encouraging, but not horrible either. I used a Maruzen APS2 with no hop-up. 90 foot range. The custom ammo grouped worse than any regular BB (tested against Intruder Shop 0.28, Madbull precision 0.28, and Straight 0.43). Good news is that the ammo wasn't tumbling when it hit paper, and the recovered ammo was still in one piece (didn't break apart). I'd like to try with a rifled barrel if I can get my hands on one.

August 4th, 2009, 15:59	#36
Kimbo formerly pivot Trader rating Join Date: Dec 2004 Location: Calgary	How bout stamping or grooving rifling on the projectile maybe.

August 4th, 2009, 18:14	#39
Bissa Trader rating Join Date: Mar 2007 Location: Kelowna, BC	If it is no longer off topic, why is it still here? couldent it be moved to general? also this looks like it should be interesting to see that the final product is

August 4th, 2009, 18:17	#41
Tankdude Trader rating Join Date: Jan 2005 Location: East Coast, New Brunswick	figure out your twist rate first. there are a few calibers in the correct size, but they won't be cheap or practical at this point. best way would be to get a button made to your spec and apply it to an inner barrel.

August 4th, 2009, 18:39	#42
DonP Trader rating Join Date: Jul 2002 Location: Edmonton, AB	Oh, if a twist barrel doesn't do the trick (and I am not sure it will) then I will consider this particular experiment to have run its course. I have no interest in, oh, button-rifling my own custom barrel blanks. I am an extremely lazy man after all and that sounds not only like work but also suspiciously like I would have to learn new things.

November 13th, 2009, 18:22	#45
DonP Trader rating Join Date: Jul 2002 Location: Edmonton, AB	I haven't been able to get my hands on an actual rifled barrel (and am not likely to) so nothing else has happened. Interesting side note is that I tried firing just the "tail" of the custom rounds (which look like a cylinder with a cone-tip on the front and an inverted cone on the rear) and they flew EVERYWHERE. Like way off course even 20-30 feet out from the muzzle. They must flip and tumble like mad all by themselves.

This isn't off-topic anymore! (was: Have YOU got a metal lathe and know how to use it?)

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