UPDATE ON KING COAT

[Guest]

we have a very special customer who has made some simple adjustments to his King Coat Cup Gun and is feeding a bag...next he will be trying a hopper ! The cost - none YEAH

[wiseguyz]

Re: UPDATE ON KING COAT

It would be wonderful if your "special customer" shared a bit of "how to". Maybe some others would be inspired to experiment as well?

[Guest]

Re: UPDATE ON KING COAT

Think outside of the BOX

[Guest]

Re: UPDATE ON KING COAT

Just Kiddin-updates will be given as the project continue's

[Desert PC]

Re: UPDATE ON KING COAT

I'm sure hoping the modifications will address the problems I'm having, none or which are insurmountable:

What I like about the gun:

The charge on the powder is incredible compared with the hobby gun I used before. Getting the powder to stick is no longer a problem. I did a 2 coat job last night with minimal issues.
Cleanup and change over is fast.


What I don’t like:

No instructions, which initially led me to believe my unit was defective (the #1 and #2 switch position). I figured it out after I opened the enclosure suspecting a stuck solenoid or bad trigger switch.

Threads on the cup lid are too fine—I’ll strip them in no time.

The biggest complaint is the lack of an air flow control. I have to bring the pressure up high enough to get the powder moving, but then I go through a cup of powder very fast (less than a minute). I get a big “whoosh” of powder and by the time I turn the pressure back, the cup is half empty; not to mention uneven powder application. Much of the powder ends up on the bottom of the booth or in the filters.

I think the design is flawed in two ways: 1) Even with the cheap hobby guns, the container attempts to fluidize the powder in the cup with airflow through the inverted tube. The China gun relies on an ‘injection’ method through a small funnel and the powder does not flow smoothly, causing a rush/surge of powder as it enters the main flow tube, very similar to the surge when sandblsing with a suction tube setup. 2) Unlike the hobby guns, there is no flow control so if you want can’t create a smaller powder cloud, even if you want to.


It’s very possible that I don’t have the operational aspects of this gun down yet, but I’m already thinking of ways to modify the powder input and add a flow control valve. I realize this guns is new without alot of collective experience out there. Any sharing of best known methods and modifications would be much appreciated!

[Guest]

Re: UPDATE ON KING COAT

Thank you for your input. As soon as we are able to make the appropriate adjustments to the gun we will keep you updated. Regarding the manual, that was completely our fault. We have this on PDF and should have sent it with your order..

[Desert PC]

Re: UPDATE ON KING COAT

$6 modification to King Coat Gun-- Thought I'd share this with other king cup owners.

Despite numerous setups, investigation, and experimentation with multiple powders, pressures, etc, I continued to experience unfavorable powder flow behaviors with the king coat gun. As mentioned before, the charge on the powder is excellent and blows away my hobby gun, but unfortunately, the hobby gun I have has more consistent powder delivery (which isn't saying much).

The king coat gun uses a venturi action to "inject" (suck, really) powder into the barrel as well as push it out of the barrel. What I found was if you minimize the trigger action (on-off, on-off), the powder flows OK-- stop and start excessively and you're screwed. If you use the trigger more than a few times per cup (unrealistic), the powder builds up in the barrel each time you stop, then you get a surge in powder with the next trigger pull (ugly).

It occured to me that I needed a way to meter the volume of powder (like on a hobby gun). I didn't want to buy a high end metering valve to test the theory, so I bought a $6.50 version from Graingers (p/n 6MN32). Installation was a breeze with no 'permanent' or destructive changes to the gun-- just disassemble the back plate of the gun and remove the needle valve from the brass body so there is clearance.

I tested the gun with the minor mods and the results were awesome! I can now get a much more consistent cloud at whatever pressure I need depending on what I'm shooting. I did not have a chance to truly exercise it as it was too late and I still have my day job to attend to .

I have plans to add an air source to the cup so I can keep the contents 'fluid', but this may not be necessary with the valve set up. I've attached a few pics here for reference.

Let me know if anyone else out there has any successful mods on the king gun-- we'll make this thing better!

[Guest]

Re: UPDATE ON KING COAT

I have a question on this gun. Is there any diagram or can anyone be specific of how the powder is "sucked in" I have an idea.

[Guest]

Re: UPDATE ON KING COAT

Thank you so much for your input ... your modifications are very helpful to all. A small hopper for this gun is also in the works

[Guest]

Re: UPDATE ON KING COAT

DP,


Thanks for the PM.

[Guest]

Re: UPDATE ON KING COAT

I have a question on this gun. Is there any diagram or can anyone be specific of how the powder is "sucked in" I have an idea.

What was your idea? I bought one of these and just starting out the fewer problems I have with the gun the easier it will be for me to
know I boo-fuued.

Harley

[Guest]

Re: UPDATE ON KING COAT

$6 modification to King Coat Gun-- Thought I'd share this with other king cup owners.

Despite numerous setups, investigation, and experimentation with multiple powders, pressures, etc, I continued to experience unfavorable powder flow behaviors with the king coat gun. As mentioned before, the charge on the powder is excellent and blows away my hobby gun, but unfortunately, the hobby gun I have has more consistent powder delivery (which isn't saying much).

The king coat gun uses a venturi action to "inject" (suck, really) powder into the barrel as well as push it out of the barrel. What I found was if you minimize the trigger action (on-off, on-off), the powder flows OK-- stop and start excessively and you're screwed. If you use the trigger more than a few times per cup (unrealistic), the powder builds up in the barrel each time you stop, then you get a surge in powder with the next trigger pull (ugly).

It occured to me that I needed a way to meter the volume of powder (like on a hobby gun). I didn't want to buy a high end metering valve to test the theory, so I bought a $6.50 version from Graingers (p/n 6MN32). Installation was a breeze with no 'permanent' or destructive changes to the gun-- just disassemble the back plate of the gun and remove the needle valve from the brass body so there is clearance.

I tested the gun with the minor mods and the results were awesome! I can now get a much more consistent cloud at whatever pressure I need depending on what I'm shooting. I did not have a chance to truly exercise it as it was too late and I still have my day job to attend to .

I have plans to add an air source to the cup so I can keep the contents 'fluid', but this may not be necessary with the valve set up. I've attached a few pics here for reference.

Let me know if anyone else out there has any successful mods on the king gun-- we'll make this thing better!

Have you used the gun any more to see how well it functions?

Harley

[Guest]

Re: UPDATE ON KING COAT

I have a question on this gun. Is there any diagram or can anyone be specific of how the powder is "sucked in" I have an idea.

What was your idea? I bought one of these and just starting out the fewer problems I have with the gun the easier it will be for me to
know I boo-fuued.

Harley

It's a hopper idea, but since beebob is working on it I will not step on his toes. I am sure it will be easy to use.

[Desert PC]

Re: UPDATE ON KING COAT

Well, now that I've had more time to use and theorize why this gun builds up powder in the barrel, I think I'm on to a new root cause. While using the gun last night (with powder valve setup), I noticed an oddity with the air flow.
Here's what happens at all PSI settings:
Depress trigger on gun, set air pressure and/or powder flow (it makes no diff)
When and if you release the trigger which switches the solenoid off, it surges the PSI at the gun and cup by what I'm guessing is 30-50% (it's hard to tell with no PSI scale on the guage). This surge causes the gun to 'suck' a pile of powder into the barrel, a split second before air flow is shut off. The powder build up and resulting 'farts' of powder (when you depress the trigger again) is directly proportional to how many times you depress and release the trigger. I found that minimizing trigger action reduces the barrel powder build up to near zero, especially using the added powder metering valve.

My guess is that the solenoid valve may be of poor quality and/or not spec'ed to the desired performance. I plan to investigate replacing the valve with a good 'ole American version and also look at how they have it plumbed. It could be that the exhaust may not be properly routed, or one of many other issues. I'll update this thread with my findings.

Desert PC

[Guest]

Re: UPDATE ON KING COAT

My guess is that the solenoid valve may be of poor quality and/or not spec'ed to the desired performance. I plan to investigate replacing the valve with a good 'ole American version and also look at how they have it plumbed. It could be that the exhaust may not be properly routed, or one of many other issues. I'll update this thread with my findings.

Desert PC

Have any new findings?