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Old 10-02-2012, 10:18 PM #631
Flatliner333
 
 
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I noticed that you really have your heart set on that custom grip and trigger design. Have you tried to get someone to build you a set out of aluminum?

Last edited by Flatliner333 : 10-02-2012 at 10:20 PM.
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Old 10-02-2012, 11:32 PM #632
brazy-u
 
 
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non jusqu'ici j'ai toujours utilisé de la Pâte Epoxy pour métal ou alu

so far I have not always used the Epoxy paste for metal or aluminum





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Old 10-05-2012, 08:33 PM #633
password1
 
 
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Build parts via Shapeways.com?

About as expensive as that epoxy.
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Old 10-06-2012, 12:52 PM #634
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tu as absolument raison, pour m'as part je n'ai appris l'existence de cette solution
qu'il n'y as quelques mois en arrière.
c'est clairement révolutionnaire même si apparemment sa fait déjà des année que
l'industrie aéronautique (entre-autre) exploite cette méthode de fabrication pour
des pièces métallique/titane et céramique.
Sa va permettre un bon technologique phénoménale c'est très très excitant.

Pour la fabrication hypothétique de mon délire je m'étais dis que je continuerai a
imaginer sa réalisation par des machine hi-tech/High Tech commune sauf comme tu la
sous entendu pour 2 pièces: la queu de détente et le grippe de la poignée arrière ou
l'impression 3d plastique est clairement la solution idéale

PS. Outre le fait que je ne connaissait pas as l'époque les imprimant 3d,
la pat Epoxy as l'avantage de pouvoirs se modelé durant quelque minute, se qui est
la première étape pour se crée un grippe adapté a sa main.
Bien sur s'est loin d'être la seul méthode.


you're absolutely right for me I have learned from the existence of the solution
there're a few months back.
this is clearly revolutionary although apparently already made ​​his year as
aerospace industry (amongst others) uses this method for manufacturing
parts metal / titanium and ceramic .
Its technology will allow a good phenomenal it's very exciting.

For the manufacture hypothetical my delirium I had said that I will continue
imagine its realization by Machine High Tech common as you except the
in course for two parts : the trigger and the rear handle flu
the plastic 3d printing is clearly the ideal solution

PS. Besides the fact that I did not know at the time the printing 3d
Epoxy pat as the advantage of power is modeled in a minute, which is
the first step to creating a flu has adapted his hand.
Course is far from being the only method.



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Old 10-06-2012, 07:00 PM #635
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I just fell into some sort of mad scientist paintball thread how did i get here and what is going on.
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Old 10-06-2012, 09:04 PM #636
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It kind of reminds me of that movie seven where the killer poors his mind out on paper filling up hundreds of notebooks with his thoughts. But I don't think he is a psycho killer.
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Old 10-06-2012, 11:45 PM #637
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maybe. maybe not.
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Old 10-12-2012, 07:31 PM #638
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i had high hopes to see something here... until i saw the epoxy pictures above which looks like someone got carried away with playdoh and just caked on whatever was in front of them.

you need to shave that **** off and work on sculpting with it alone if thats going to be the medium you use.
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Old 10-15-2012, 10:09 PM #639
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Quote:
Originally Posted by DuckWalk View Post
i had high hopes to see something here... until i saw the epoxy pictures above which looks like someone got carried away with playdoh and just caked on whatever was in front of them.

you need to shave that **** off and work on sculpting with it alone if thats going to be the medium you use.

you sir have no appreciation for the creative process this man has been able to accomplish, he went from concept and idea to completion of design translating french to poor English and viceversa. This **** you talk about is not easy. so, ignoring your childish and absurd comments please leave and never come back.
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Old 10-15-2012, 10:11 PM #640
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viva la BRAZY-Ü!
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Old 10-16-2012, 02:05 AM #641
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esque quelqu'un a déjà procédé à une recherche de ce genre:

esque someone has already carried out a search like this:



évaluer la pression minimum nécessaire pour propulser une bille à 310 fps.

evaluate the minimum pressure required to propel a ball at 310 fps.



pour ma part je crois que le moyen le plus simple est le moins chère ( pour ceux qui
ont accès à un autococker mécanique ) c'est de le dénuder quasi intégralement , il
faut juste conservez ce que j'ai mis sur le dessin
la plus grosse difficulté c'est la chambre d'expansion, j'ai dessiné une méthode mais
il existe bien d'autres solutions moins chère est plus accessible comme la bonne
vieille bouteille tampon
cette austérité a pour objectif de permettre un long transfert d'énergie à la bille
en s'assurant que la cullasse ne bouge pas et surtout que la valve reste ouverte très
longtemps

For my part I think the easiest way is cheaper (for those who
have access to a mechanical autococker) is to strip it almost entirely, it
You just keep what I put on the drawing
the biggest challenge is the expansion chamber, I drew a method but
there are many other cheaper solutions is more accessible as good
old bottle buffer
This austerity is intended to allow a long energy transfer to the ball
ensuring that the Culet not move and especially that the valve stays open very
for a long time




il est bien entendu que cette recherche n'a pas pour objectif de produire à gun
économique en gaz mais bien de connaître dans certaines conditions
la plus basse pression efficace pour propulser la bille à 310 fps

It is understood that this research does not aim to produce gun
economic gas but to know under certain conditions
the lower pressure effective to propel the ball at 310 fps


--


a ce niveau de pression le calibrage du fût du canon sera très important, avec malgré
tout une tolérance pour le sur-calibrage (du canon)

this level of pressure calibration of the gun barrel will be very important, albeit with
any tolerance for over-sizing (barrel)




durant la phase de tire le bolt doit être fixé/immobiliser

during the pull phase of the bolt must be fixed / stop



énorme volume d'air à la (très basse) pression de service
le volume permettra d'assurer un flow d'air à pression relativement constante pour
propulser la bille

huge volume of air in the (very low) pressure
volume will ensure a flow of air at a relatively constant pressure to
propel the ball



le régulateur dois pour cette expérience délivrer une pression la plus faible possible
en partant de 90 Psi

the controller for this experiment should deliver a pressure as low as possible
starting from 90 Psi




l'ouverture de la valve doit être assez longue affint d'assurer que la bille puissant
cumuler assez d'énergie pour limiter l'influence du frottement de sa coque contre la
paroi du fût du canon

the opening of the valve must be long enough to ensure that the affint powerful ball
accumulate enough energy to limit the influence of friction of the hull against the
wall of the gun barrel





pression longue du pouce sur la tige du marteau

long press of the thumb on the hammer rod


si le clone na besoin que de 90psi pour assurer le fonctionnement de son moteur
et la propulsion à 300fps de ses projectile je parie que la seule propulsion de la
bille peut se faire aux alentours de 40 Psi


if the clone did need to 90psi for the operation of the engine
and propelling its projectile at 300fps I bet the only propulsion of the ball can
be around 40 psi









Last edited by brazy-u : 10-16-2012 at 04:23 AM.
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Old 10-16-2012, 04:22 PM #642
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On peut déjà faire un premier calcul théorique :

Vitesse de la bille en sortie 300fps = 91.44m/s
Longueur de canon (important dans le calcul) = 15" = 381mm

A partir de ces paramètres, on peut calculer l'accélération nécessaire de la bille pour avoir une vitesse de sortie de canon donnée : a=V²/Lcanon

Diamètre d'une bille = 0.690" = 17.5mm ==> Surface d'une bille = 241mm²
Masse d'une bille = 3g

==> On peut calculer la pression nécessaire en bar : 10*V²*Mbille/(Lcanon*Sbille) en utilisant les unités que j'ai données.

On a par exemple, pour un canon 15" et une bille de 3g, une pression mini de 2.7bar. Cette pression est valable si elle est maintenue constante, en négligeant toute perte de charge et en considérant une parfaite étanchéité entre la bille et le canon. Je pense qu'un coefficient 2 ne serait pas de trop pour compenser ces hypothèses. Une pression de 5bar me semble a priori convenable.
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Old 10-16-2012, 05:09 PM #643
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c'est en tout point magnifiques!
merci beaucoups rigolo 7788
je suis très impressionné


this is beautiful in every way!
*thank you alot rigolo 7788
*I am very impressed
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Old 10-17-2012, 06:40 PM #644
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la pression atmosphérique est elle un facteur négligeable?

atmospheric pressure it is a negligible factor?



-------------------------------------------------------------------------------------

rigolo 7788 j'ai une question très importante et si tu acceptes de jouer le jeu tu dois me
convaincre par des arguments mathématico scientifiques qu'il existe des facteurs qui
peuvent influencer la courbe de la bille pour lui donner une trajectoire plus ou
moins tendue.
tu seras probablement d'accord avec moi, que l'on peut oublier l'effet de backspin
(parce que les frottements (équilibré) contraigne la bille à aller droit dans le
tube, annulant ainsi les effets imprimer en amont)

s'il existe réellement deux courbes je ne vois qu'un seul facteur qui peut le
générer : la déformation de la bille durant sont vol mais je n'y crois pas! il me
semble logique qu'à condition équivalente il n'y ai qu'un type de trajectoire et
ce quelque soit la technologie du gun qui propulse la bille



rigolo 7788 I have a very important question and if you agree to play the game you have to
convinced by arguments that mathematical scientists are factors that
can influence the curve of the ball to give a path more or
less tense.
you will probably agree with me, that we can forget the effect of backspin
(because friction (balanced) compels the ball to go in the right
tube, thereby nullifying the effects print upstream)

if there are actually two curves I see only one factor that can
generate: the deformation of the ball during flight are but I do not believe it! I
equivalent condition seems logical that there was a type of path and
that whatever technology gun which propels the ball











.................................................. .300fps

.................................................. ...300fps

Last edited by brazy-u : 10-17-2012 at 07:31 PM.
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Old 10-17-2012, 11:18 PM #645
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Step 1. Connect the output of a common air tank to a paintball barrel.
Step 2. Place a nylon ball (same mass as paintball) at the rear of your barrel so that it prevents the air in the tank from escaping.
Step 3. Use a pin or other mechanism to prevent the ball from launching while you fill the tank.
Step 4. Release nylon ball and note pressure/velocity relation.
Step 5. Increase pressure until you reach 310FPS.

At 300PSI I get ~25psi.
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Old 10-18-2012, 01:43 AM #646
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"At 300PSI I get ~25psi."

voulais tu dire? wanted you mean?

"At 300FPS I get ~25psi."

1.72Bar~25psi c'est impressionnant! this is awesome!
merci. thank you.

PS:
si je n'ai rien compris pourrais tu mettre des photos ou des dessins s'il te plaît.
if I do not understand you can put pictures or drawings please.

Last edited by brazy-u : 10-18-2012 at 01:55 AM.
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Old 10-18-2012, 01:40 PM #647
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Les calculs que j'ai fait sont purement théoriques et très approximés puisque j'ai négligé la résistance de l'air (Rhô(air)*S(bille)*V²/2).
Je ne suis pas expert en méca flu et je ne m'y suis pas replongé récemment donc je ne pourrai pas te donner de réponse très argumentée mais pour moi les paramètres qui influent sur la trajectoire de la bille sont :
- Calibrage de la bille et du canon (influe sur le guidage de la bille et sur la chute de pression à l'arrière de la bille à cause de la non étanchéité)
- Forme interne du canon, dont le diamètre peut varier et faire que l'accélération de la bille subissent des variations importantes dans le canon
- Masse de la bille
- Rigidité de la coque de la bille (ce qui explique que les billes "haut de gamme" sont des billes dures, qui restent bien rondes malgré les efforts qu'elles subissent, et suivent donc toutes la même trajectoire)
- Et pour moi l'un des plus importants, le flux d'air à la sortie du canon (d'où l'existence de culasses à effet venturi et autres) qui, je pense, est déterminant au moment de la sortie du canon

Il me semble difficile, voire impossible de mettre tous ces paramètres en équation sans étude poussée et l'étude par itération et tests physiques me parait la solution la plus judicieuse (mais aussi peut être la plus chère et la plus longue)

PS : Par faute de temps, je ne rajoute que la traduction Google

The calculations I did are purely theoretical and very approximated because I neglected air resistance (rho (air) * S (ball) * V ² / 2).
I am not an expert in fluids mechanical so I can not give you very reasoned response but for me the parameters that affect the trajectory of the ball are:
- Calibration of the ball and the barrel (influences the guide of the ball and the pressure drop on the back of the ball due to the non sealing)
- Internal form of barrel, whose diameter can vary and the acceleration of the ball undergo significant changes in the barrel
- Mass of the ball
- Stiffness of the shell of the ball (which is why the balls "upscale" are balls hard that stay round despite the efforts they undergo, and therefore all follow the same path)
- And for me one of the most important, the flow of air at the outlet of the barrel (reason why venturi and others bolts exist) that I think is crucial when leaving the barrel

It seems difficult, if not impossible to put all these parameters in equation without thorough study and the study by iteration and physical tests seems to me the most sensible (but can also be the most expensive and longest)
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Old 10-18-2012, 06:31 PM #648
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OK!! j'imagine bien le casse tête que ça doit être
ok! I imagine the headache it must be
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Old 10-23-2012, 03:40 AM #649
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Old 10-23-2012, 04:54 AM #650
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Old 10-23-2012, 05:37 AM #651
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