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Old 03-08-2018, 12:19 PM
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Spray gun orifice size

Out of curiosity, why do we actually buy so much into spray gun tip size?

Obviously, for thicker materials, you need a bigger orifice, but what i'm getting at here is:

'What is the difference in using a 1.5 and a 1.3 for clear coat if they are set to flow the same amount of material per minute?'

I suppose for spraying metallics you could argue that the smaller tip would give you more trigger travel for feathering, but aside from that, I don't see why it matters if you are getting a certain amount of material/air.

Enlighten me!

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Old 03-08-2018, 12:34 PM
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Some materials just lay down better with a certain size of tip.. What i use lays down with a 1.4.. You will find that with experience what sizes work best for you inn your shop but until then the paint makers work to find the best size tips for their material and experienced painters can help you..

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Old 07-09-2018, 12:29 PM
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What Sam said. Just find what works best for you, and your set up, and run with it.
I use a 0.9 fluid tip for just about everything except primers, then I have a 2.0.
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Old 07-09-2018, 01:33 PM
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Yeah -- I guess what I was looking for when I asked this was something more scientific. I'd be curious to see if someone has actually done a real study of otherwise identical guns using a 1.3 vs 1.5 tip set to flow exactly the same amount.

"Why does a smaller nozzle become necessary if you can adjust one very close in size to flow the same amount?"

I know that some guns have different air caps for different nozzle sizes. In that case, it may become more evident that there is something to do with the ratio of air/fluid coming into play. For those guns that use the same air cap for different fluid tips...I don't see that .2 mm in "stream diameter" could make a huge difference with the same flow.
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Old 07-09-2018, 03:09 PM
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I'm not sure if there would be an exact scientific approach to doing it, but I have messed around with my gun quite a bit. I do alot of motorcycle stuff, small parts. I can set up my gun with a 1.2, at 26 psi about 2 turns out and finesse the clear on with a nice fan and really good atomization. With the same set up and a 1.4, of course now I'm blowing paint everywhere and having to keep up with the gun instead of the other way around, so I choke the fluid down and down and down to nothingness and still never get the same level of atomization and the finish I'm looking for.
There's as many different ways as there are painters, a 1.4 from one gun to the next sprays differently etc. I have an old Sata jet Hvlp with a 1.4. The thing is an absolute hand cannon compared to the Pro Lite and it gets used on large projects and single stage all-overs. Primers need a large tip for the fillers in them. Where I'm at here in Md/De area we're on the low Voc stuff same as Cali. Some of these HS clears are thick and syrupy and call for very little to no reducer. They have little to no flow so with the clears you might need to go from a 1.4 to a 1.3 to break it up and get it on flat. Just my IMHO.

Last edited by Hipster_G; 07-09-2018 at 03:21 PM.
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