The Mean Green Bean's OBA thread, Update 8-25-2024.

[PIP]

At what PSI does it deliver 6CFM?

Is the tiny intake hose a restriction? I have some time around small industrial compressors- 20 to100 CFM sized- And have never seen an intake pipe that small. Twin 20 CFM @175 PSI Quincy's run my shop air and they have 1" ID intake piping to feed that. If your theoretical CFM was 10 CFM I wonder if you increased the suction piping ID to half the area of 1" if it would help?

 

[Rusty Marlin]

I calculated the 6 CFM on the make up pressure of 120 to 150.
This is the calculation I used:
Cubic Feet of system x Delta P in atmospheres x 60/time in seconds for Delta P

https://www.hunker.com/12174007/how-to-calculate-the-cfm-of-an-air-compressor

The inlet line is 1/2" air line. .196in^2
I that used the because its what everybody is using on the Yorks. No engineering went into it, "just monkey see, monkey do".

 

[Rusty Marlin]

I don't know who needs to read this, but here it is... Pacifiers for QD air chucks are dumb!
If there is enough crap in the chuck to keep an air fitting from working properly, there is enough silt and junk in the collar and ball lock to keep it from working properly.

So I made a custom bulk-head fitting out of Naval Bronze with sealed cap to cover my QD air chuck after replacing the original because it was getting crap in the mechanism and locking it up. I got tired of cleaning the chuck before I could use it.




Air tight, water tight, silt proof and stainless-steel-cable-tethered to the fitting so its nearly impossible to loose the cap.

 

[mudgudgeon]

I don't know who needs to hear this, but here it is... Pacifiers for QD air chucks are dumb!
If there is enough crap in the chuck to keep an air fitting from working properly, there is enough silt and junk in the collar and ball lock to keep it from working properly.

Anyone who's used air hoses and tools in a construction site or field setting could tell you this.
Fittings wear and jam fast as soon as there's wet weather.

I like your fancy bronze cap

 

[unclegit]

This seems like a good project for a 3d printer - add an O ring to seal it etc.

Once I get my air install completed I'll have a crack at modeling one up.

 

[Rusty Marlin]

This seems like a good project for a 3d printer - add an O ring to seal it etc.

Once I get my air install completed I'll have a crack at modeling one up.

Don't know what you're using for a 3D printer, but all the FDM machines I'm familiar with make very pourous, highly layered parts, not sure how its going to hold up to 100+ psi as a bulk head fitting, my guess is it won't. The bulk head fitting has NPT threads back to back to pass through the bracket (bulkhead). The truck side has a push-to-connect airline fitting and the bumper side has the QD air chuck. It's a pressureized part, in my case 150 PSI or ~10ATM.
You could turn up the bulk head fitting and print the cap. I thought of that, but if you're going to take the time to turn up a custom fitting and mill in a hex, might as well go all the way and make a pretty cap too.
Oh, and there's an o-ring, middle pic, hiding behind the cable tether.