Needle/Nozzle question

[mazelda]

Ok after a not so stellar first attempt at airbrushing I decided to do a complete strip down of my cheapo airbrush
It does strip down very well and access to all the parts can be done, however on reassembly although every thing has gone back properly and functions fine I wondered afterwards if there was a position that the needle sits in relation to the needle.
Should the needle tip be as far forward as it can go on reassembly or level with the nozzle end or even slightly recessed in the nozzle.
So I can achieve a wide spray with it pulled fully back and a nice fine line when fully forward.
Is there a rule of thumb when reassembling an air brush after a strip down

Thanks

[MarkVerploeg]

At the moment it would be very hard to say
It helps a lot if you have some pictures of the airbrush
That way others get an idea of what kind of ab it is and are able to help
Mainly because there are different ways that airbrushes are made
Ie h&s has a different desing of their parts then Iwata
So if you have some photo's of your airbrush i am sure someone will br able to help out

[mazelda]

will post picture when I get the chance, but in the mean time the AB in question is a non branded offering that came with my compressor an AS186
the parts picture calls it an HS32 but thats it and has a very small spanner for undoing the nozzle
sorry cant be more specific but I'm at work at the moment and not anywere near my AB
thanks

[MarkVerploeg]

That's ok
It doesn't really matter wich brand/type it is
A picture tells more then a 1000 words
And that will help us to help you with your question

[mazelda]

What sort of picture do you want?
Just of the nozzle or of it stripped down ?

[MarkVerploeg]

Both would be best
And maybe you could show what you mean with the positions of parts
I am no expert on ab's but maybe i know what is the problem
Or somebody else as there are a lot of airbrush users on the forum

[Switcher]

... from my experience and what I have found out is that the needle tip gently sits against the nozzle (the needle tip boddy (not the tip) acts as a valve and the nozzle as the valve seat)). When replacing the needle in the brush, do it gently and nudge it against the nozzle, then tighten your needle chuck. If the needle is not sitting against the nozzle itself, when the trigger is depressed paint will flow from the brush vice spraying when the trigger is pulled backwards on dual action ABs.

[schweinhund227]

... from my experience and what I have found out is that the needle tip gently sits against the nozzle (the needle tip boddy (not the tip) acts as a valve and the nozzle as the valve seat)). When replacing the needle in the brush, do it gently and nudge it against the nozzle, then tighten your needle chuck. If the needle is not sitting against the nozzle itself, when the trigger is depressed paint will flow from the brush vice spraying when the trigger is pulled backwards on dual action ABs.

I back that up !

Well said Switcher....
that is my understanding of how the A/B works...

[mazelda]

ok hope this works




[imghttp://i1382.photobucket.com/albums/ah263/gingerbones1/image1_zps862ed240.jpeg][/img]



In regard to the question about the needle and nozzle position I've exagerated the needle position but image 6 is fully forward as far as the needle will go,image5 is needle tip level with nozzle tip and image 1 is recessed in the nozzle.

Thanks switcher
from what you are saying do you mean that the needle sits bak from the nozzle tip would be more in the image 1 position

Thanks for the help guys

[MarkVerploeg]

Seems to me that switcher was right
There should be a little bit of space between the actual nozzle (where the needle is in) and the cap that covers the front part of the airbrush
Otherwise there is no good airflow
So i hope your question is awnsered although not by me really
But aslong as it is solved right

[Switcher]

*SNIP
Thanks switcher
from what you are saying do you mean that the needle sits bak from the nozzle tip would be more in the image 1 position

Thanks for the help guys

No good buddy.

You push (nudge) your needle as far as it will go. You will feel the resistance once the < part of the needle --< comes into contact with the nozzle (< nozzle interior). The tip of the needle is protruding past the nozzle itself, because the nozzle has a hole in the tip. The < of the needle "body" acts as a valve (no different than a needle valve in a carburator). The nozzle is merely the valve seat. The tip of the needle (the extremely fine and delicate point) is nothing more than a "metering device" when the needle is pulled back from the nozzle tip, it allows a certain amount of paint to flow through, the larger you unseat the valve (needle body) from the valve seat, the more paint will flow through the orifice of the nozzle. I hope this clarifies things for you. If not I'll gladly make a dwg on the subject

[Switcher]

Seems to me that switcher was right
There should be a little bit of space between the actual nozzle (where the needle is in) and the cap that covers the front part of the airbrush
Otherwise there is no good airflow
So i hope your question is awnsered although not by me really
But aslong as it is solved right

Sorry Mark good buddy I didn't want to steal your thunder, but I couldn't phatom where a picture would explain what the OP was after. We must/should compare ABs to the needle valve (as mentioned above) in a carburator.

In the industry (valve industry), needle valves are used for fine tuning/control in low pressure and low velocity applications. It goes without saying that depending on what medium we are controlling, needle valves could be small to extremely large and robust. Nonetheless, their operating principles remain unchanged.

[mazelda]

Thanks switcher
From my understanding then what your saying is that I should have push the needle as far forward as it can go, without forcing it through the nozzle hole but just let it find its own fully forward
Thanks
gonna have a look at your vid now

[MarkVerploeg]

Seems to me that switcher was right
There should be a little bit of space between the actual nozzle (where the needle is in) and the cap that covers the front part of the airbrush
Otherwise there is no good airflow
So i hope your question is awnsered although not by me really
But aslong as it is solved right

Sorry Mark good buddy I didn't want to steal your thunder, but I couldn't phatom where a picture would explain what the OP was after. We must/should compare ABs to the needle valve (as mentioned above) in a carburator.

In the industry (valve industry), needle valves are used for fine tuning/control in low pressure and low velocity applications. It goes without saying that depending on what medium we are controlling, needle valves could be small to extremely large and robust. Nonetheless, their operating principles remain unchanged.

No problem Switcher
I just didn't completly understood what he was asking for so i though that if i could see it i got a better idea of the problem at hand

[Switcher]

No problem Switcher
I just didn't completly understood what he was asking for so i though that if i could see it i got a better idea of the problem at hand

Cool beans Mark Knowing your native tongue is not English, which you handle extremely well by the way. I thought that you may not have interpreted what the OP asked, and decided to jump in.

[Switcher]

Thanks switcher
From my understanding then what your saying is that I should have push the needle as far forward as it can go, without forcing it through the nozzle hole but just let it find its own fully forward
Thanks
gonna have a look at your vid now

That is exactly what I am saying, trying to convey