Fogless Mister Systems

[JAZZCNC]

Since I'd have to source and buy suitable needle valves, taps, fittings etc, I'm wondering whether it's worth taking a punt on one of the ready-made units from China

Problem is Si they are mister so work on venturi affect which creates the fine mist and chokes you to death.!! You wouldn't live 5mins in your little place.!!
You need a pressured system that injects drops into the air flow. Actually very easy to make but requires pressure vessel and valves etc.

Or just have 2 pipes one for air and another with collant drip feeding into the air flow.!!! . . . . Simplizzzzzzzz

[Boyan Silyavski]

May be you are already aware of these plans, seems quite cheap and easy to build.

I am also contemplating how to do it.

Perhaps the cheapest and least complicated way to do it will be to dedicate small air compressor +the nozzle from the plans above.

Now comes to my mind that instead of fiddling with pressure tanks, connectors and so, it would be best to use the compressor tank itself and half fill it with cooling liquid. So the drain valve connection will feed the cooler line, the air will come from the air line. Both lines will go into the nozzle and mixture will be regulated via needle valve there.


So basically the only modification needed will be fit inlet valve from where the liquid goes in. Though can be done by simply unscrewing the regulator above or the liquid line below and refill, without any modification.

[firetrappe]

Dean - Thanks for the input. I realised the ones I linked to are used the venturi principal which atomises the droplets. This is the effect i'm getting at the moment using my cheap airbrush setup
And you're right, the fine mist created is horrible and fills my little shed in minutes! I was thinking of using the mixing block etc from one of those systems but feeding it from a pressurised coolant container.

Silyavski - Thanks for the link to those plans. I'd seen them before, but they were linked to from this thread. Karl_T recently modified that system as it didn't work well with air-blast only (see post #64).

I like your idea of using the compressor's tank as the coolant dispenser. My only concern would be that you would get water mixed in with the coolant (not a big issue) but you're also likely to get rust particles contaminating/blocking the coolant line.

My preference would be to have 2 regulators coming from the main tank outlet, one for air pressure, one for coolant pressure. Feed the coolant line into one of these (as shown in the link above) then to the mixing block and run the air line directly to the mixing block.

I'm also thinking that it might be beneficial to have 2 lines/nozzles from the mixing block rather than one. I think that 2 nozzles at 90º to each other would be more effective at clearing chips from deeper slots when using air blast only. Maybe one for air and one for mist, with the option to use both as air only.

I'll keep reading and searching suppliers to see if I can come up with plan.

[Boyan Silyavski]

Some update. i like designing and challenge.
I tried the way they tell it but the effect was not to my liking. The spray pattern was not good and the control of the flow was lame.

So in my free time i started experimenting and little by little i designed my own fog-less mister cooling. Bellow is a video of me testing the nozzles while Jeff is cutting my Z axis spindle mount, this today. Unfortunately the phone battery run low so i captured the moment with too much flow from the nozzle, you can see the mist at the back, though in fact its no mist but droplets, there was too much flow. So the video is of how it should not be, but you can see the cleaning effect of the air blowing away the chips.

Later when i lowered the flow it was perfect, blowing the chips, cooling the bit but at the same time no mist in the room after half an hour milling. I am thinking to manufacture some and sell them for a reasonable price.

What i can say is that just sticking tubes together as per some drawing does not work well, all flow connections and transitions should be well thought and shaped, plus the exit nozzle must be shaped properly. when done properly the flow seems to reach ultrasonic speed judging by the sound and at the same time does not mist but forms nice, thin, long, properly shaped flame like cloud that disappears completely after hitting the material. The best result is when at the middle of the "flame" at "ultrasonic" speed forms a nice needle like thicker stream of droplets.

what i mean without wanting to insult somebody is that after i played around and experimented for a couple of days, i saw that even a product which all worship and is worth 350$ is not so well thought of, as they want us to believe. Some day when i have more time will illustrate what i say with photos and proper video. lets say that with the bigger flow nozzle when adjusted properly i achieved a 40-50cm long stream where at this long distances is only 5cm wide and still no mist there. Its only flow being too much flow, though maybe for stone will be ok. In fact if there was a reflector at the back where the flow could hiot it there was no mist at all, cause all droplets were falling down. The problem comes with too much flow and nothing to stop them. At the end there is transition to mist, so that must be avoided, by limiting the flow for example or the nozzle size and shape.


For now a crappy video of the system . Forgot to say also- crappy Chinese valves and speed adjuster did not work. Same with custom valves made from this and that. But "made in Italy " valve worked like a charm for precise flow control. Guess why.

[johnsattuk]

I got fed up with trying to get the flows right, so made this

[Boyan Silyavski]

I got fed up with trying to get the flows right, so made this

You could sell that at Etsy as steam punk art . Man, its beautiful. Looks like a mist cooler coming from the future or like something savaged from a spaceship station

[johnsattuk]

Totally independent control of Fluid and air, air can be pulsed for better pocket clearance,without affecting the amount of fluid delivered. Can squirt fluid alone (up to 90 cc's a min )for some jobs.

Fluid container can be put wherever you like ( within reason) , does not siphon or drain back, will handle different viscosity's .

[CNCModeller]

I got fed up with trying to get the flows right, so made this

Hi All,
I Just wanted to say thank you to johnsattuk for the idea, I have built one of his peristaltic coolant systems and it works a treat!!

Very happy :-), if you'd like to see how it looks and works then follow the link below to my YouTube video at:

https://youtu.be/URk_8mYi-z4

Many thanks again!

Cheers
Barry M

[Will_D]

Have just ordered something from Amazon for £15! Basically its the venturi, 2 flow control valves (air and coolant), a length of Loc-Line and a nozzle at end. Not sure whats going to happen but sure we'll see.

Question; What is the fluid used/ Soluble oil and water or what? WHAt dilution / ensity should the fluid be?

For the price I'm not expecting any instructions

Will