Setting HVLP Gun - Videos

H

hoodun

After struggling with orange peel this past weekend on my first paint job I discovered that a lot of painters just leave the fluid wide open, adjust the pressure by ear, and set it about 3/4 off of full when looking at the triangular pattern coming out (or on full in some occassions where you want it one really wet).

I find that using the trigger as a variable control, I am able to just back off it when I am getting peel and dial it in quicker and easier by feel than by adjusting the knob and locking it. I can lock it though once I get the perfect amount dialed in with the handle.

Here are some videos I watched which pretty much say the same thing. These helped me to understand why SPI recommends what they do in the adjusting your gun write up:

https://www.youtube.com/watch?v=FHmMaPnH5Ow

https://www.youtube.com/watch?v=3Rcknl8Tvd8
https://www.youtube.com/watch?v=uTSPSiJuxZI

Anoter good video about wall pressure in relation to gun:
https://www.youtube.com/watch?v=HDuuJvyiZiI
 
The SATA one was the best. What confuses me is that he said to bring wall pressure to close to spraying pressure then do fine adjustments at the gun. That runs contrary to what is advised here.
 
It makes sense to me why you would want gun pressure close to what it should be at the gun.
 
Does anyone here run a diaphragm style air regulator on these gun? I've heard the air pressure will stay more constant as the compressor empties and fills?
 
i have an iwata gun with the iwata reg. stays constant pressure. running the wall wide open helps this also . anyone tells you to adjust at the wall stop listening .

if you notice a build up of pressure when you first pull the trigger then you have an flow control valve . useless .
 
View attachment 4304

You run this style Shine? Anest-Iwata-Compact-Diaphragm-Style-Regulator-AK-1R.jpg
 
hav-511_gauge.jpg

I've always ran this style and I always have to periodically adjust the pressure at my gun. I know its not my compressor that's lacking. I have a Quincy 325 and that thing turns off while I am spraying, so I assume it can keep up.
 
i use the first one. different gauge but the same. the second one is a flow control , often called a cheater valves. for guns it's pretty useless .
 
Had a chance to the new diaphram reg. Holy shit what a difference. The gun pressure dropped barely a pound from when the compressor turned off to when it kicked back on. That compared to almost 10lbs with the other air adjuster valve.
 
Funny story regarding the wall pressure, we have a real high end restro shop in IN, (Justin) he had used Spies for ever and then converted to SPI, from the high solid clear of Spies (LOL) air pressure at the wall was at 60, no problem, also the Spies High solids was recommended a 1.2 tip gun.
I told him up front the SPI will not spray out of the 1.2, he did not believe me.
First time he tried he had to buy a 1.4 tip for his Iwata and had him adjust the wall pressure high as it will go.
Worked great, he could not believe the difference.
Two months later he saw a video by either Iwata or Sata on how to adjust your wall pressure, like you did.
The call i got was what the hell did you do to the clear???? Two screwed up panels in two days.
OH, the same gallon worked great a few days before, my only question was where is the wall pressure? then he explained, jacked it back up and were were good to go and all problems stopped.
Remember Sata and Iwata do all spray testing on q-cards, I can make a q-card look like a base clear with an aerosol can but I cannot make it look good on a whole door, they have no clue.
Justin is not on here but he reads this, maybe he will post as he is one of the best.
 
Problem I have is that every single gauge I buy reads differently. One says 25 is 30, the other says 25 is 20. They can't be trusted to be consistent from one to the next. This is fine if you get used to the value your old trusty gauge reads, but when it breaks and you get a new one, don't expect to set it the same as the old one because it will be different.
 
I have a SATA digital connected to an iwata diaphragm regulator.
When i set the regulator to a specific psi, the digital guage on the gu reads a few psi lower.
What reading should i go by?
 
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