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Author Topic: spraying/ gun question  (Read 1721 times)

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Janspeedcapri

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spraying/ gun question
« on: August 27, 2008, 17:31:31 PM »
been playing with my spraygun for the first time (not he schutz gun - the paint one) I used it to put on some ferrozinc (to go under the stoneguard) which is waterbased. I thinned it with water and it did a nice job but as is always the case with me, I get stuck in and ask questions later   WOT do the 2 turny kniobs do??? I never touched them but noticed them when cleaning the thing afterwards lol. Also, I had my reg set to about 40 psi...was that right?
what would be the general rule of thumb where these knobs and the pressure are concerned, for spraying paint?



Offline Mik

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spraying/ gun question
« Reply #1 on: August 27, 2008, 19:39:48 PM »
On a standard spray gun, the knob facing back to you is for the flow rate. This just increases the amount of paint sent out through the spray tip. Wind it in clockwise and the flow is reduced and visa versa. the other knob is for the spray fan width. This sends 2 jets of air out through the lugs at the spray tip which flattens the round spray jet into a fan shaped spray. The more you open it the further it spreads. You can also change the plane of the fan. Just loosen the cup cover, rotate the lugs and tighten. If the fan spreads north/south then spray left/ right and visa versa.
Now, as the spray fans out, it takes more paint to cover the workpiece and you get more paint bounce back.
Its all a balancing act which is best learnt with practice.
Just stick to narrow fan for solids, primers and laquers and wide fan for metallic bases. It the fan knob is kept shut, then the gun will just spray a jet of paint. this can be handy for applying very small amonts of paint as you can use the gun as an airbrush.
Another factor is the size of the jet on the gun. Too big and your compressor wont be able to maintain pressure. Too small and the gun won't perform to its full potential.

Some guns come with a built in pressure regulator but these aren't nessesary.

As for pressures, 40psi is ok with very thin paint but you'll need higher pressures to lift thicker paint.


Mik.

Janspeedcapri

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spraying/ gun question
« Reply #2 on: August 28, 2008, 00:19:43 AM »
cheers mick - you answered all my questions   I better get some extra paint for practicing - thanks mate.

Offline Dave

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spraying/ gun question
« Reply #3 on: August 28, 2008, 01:10:20 AM »

Bloody good answer that
Dave

Offline Mik

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spraying/ gun question
« Reply #4 on: August 28, 2008, 08:25:15 AM »
Well one does ones best, doesn't one.  

Mik.

IansSaph

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spraying/ gun question
« Reply #5 on: August 28, 2008, 09:17:15 AM »
Quote from: Mik
Well one does ones best, doesn't one.  

Mik.

 

nice one

 

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