Eureka! Zero fog mister
On Friday, February 22, 2002 at 6:47:17 AM UTC-5, Karl Townsend wrote:
I've used a mister for many years on both lathes and mills. I hate the mess of flood coolant leaking all over the floor and mist cooling gives about 90% of the benefit. The major problem with mist cooling is fogging or atomizing the coolant so fine it floats around in the shop. Since I'm running a machine many hours a day, I've gotten real sensitive to the fog - it gives me a sore throat. Anyway, I read about a low fog mister called a HenchForth Fog Buster here on this NG. A fellow had obtained a copy of the patent for this unit and made his own. So, I did the same. This unit was better, but still a slight fog or smell of coolant would be in the shop. But,it gave me the idea of how to build a better one. This unit works so well, you can't tell its on - no sign of fog or odor of mist. The key to operation is in the relative pressure of the coolant and the supply air pressure. A standard mister has the coolant unpressurized and uses 40 - 60 psi air. The Hench unit pressurizes the coolant container to the same pressure air as the air line. This unit uses a higher air pressure for the coolant than the air line. A short explanation of construction: 1. Build a coolant container out of an old 20 lb. propane tank. Make a removable top to refill coolant (just a 1/2" pipe plug). Weld in a drain line connection to the bottom of the tank. Provide a way to use a regulator and air line to pressurize the tank to 20 PSI. The drain line goes to the mister as a pressurized coolant supply. 2. Provide an air supply regulated to 5 psi. Make a way to shut off both this line and the coolant line when the mister is not needed. I used solenoid valves on my CNC machine so an M code can control the mister. 3.The mister unit joins the water line and the air line with a needle valve to control the amount of coolant delivered. Use a small block of brass to make this assembly. The air line passes through the block and must be necked down to 0.100 " dia. so the air velocity is high. At this point, the coolant line intersects the air line. The coolant line must be very small, I used 0.040 " dia. at this point. Just upstream from where the coolant enters, there must be a needle valve to regulate coolant flow rate. I just soldered in a McMaster needle valve - 48965K24. 4. Use a 6" long 1/8" OD brass tube for the mister extension shaft. To the end of this solder a nozzle. This must be 0.75" long and have an inside diameter of 0.040". Again, this unit is a total success for me. It runs up to six hours a day with absolutely no fogging. Mist rate can be controlled from nearly nothing to a heavy, nearly flood mist. Pics: http://www.metalworking.com/dropbox/...g%20Mister.JPG Drawing of combining block: http://www.metalworking.com/dropbox/...g%20Mister.DWG P.S. The unit was very easy to build with the exception of the nozzle. See "ARGH - can't drill small hole in copper" thread. G -- An apple a day keeps the doctor away. Two apples a day gets the doctor's OK. Five apples a day makes you a fruit grower, like me. Karl Townsend in beautiful Dassel, Minnesota can somone please put a drawing back up ,, may thanks Jeff |
Eureka! Zero fog mister
On Tue, 29 Nov 2016 17:44:51 -0800 (PST)
jeff toycen wrote: can somone please put a drawing back up ,, may thanks Jeff Try these: http://www.mwdropbox.com/DropBox/_20...Fog_Mister.DWG http://www.mwdropbox.com/DropBox/_20...Fog_Mister.JPG http://www.mwdropbox.com/DropBox/_20...Fog_mister.pdf http://www.mwdropbox.com/DropBox/_20...Fog_Mister.txt -- Leon Fisk Grand Rapids MI/Zone 5b Remove no.spam for email |
Eureka! Zero fog mister
As the mwdropbox.com says it was the old dropbox we had years ago before
companies sell out or crash. It was hosted by a private company for years. IIRC, the man that runs it now was able to save the files and start it up again. I have a number of posts but enjoy seeing some of the pictures of members on the site as well. Browse and find gold and rust. Martin On 11/30/2016 7:43 AM, Leon Fisk wrote: On Tue, 29 Nov 2016 17:44:51 -0800 (PST) jeff toycen wrote: can somone please put a drawing back up ,, may thanks Jeff Try these: http://www.mwdropbox.com/DropBox/_20...Fog_Mister.DWG http://www.mwdropbox.com/DropBox/_20...Fog_Mister.JPG http://www.mwdropbox.com/DropBox/_20...Fog_mister.pdf http://www.mwdropbox.com/DropBox/_20...Fog_Mister.txt |
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