Here is how I did it. I took a short piece of brass bar and drilled most of the way through with a drill slightly bigger than the smallest tube I could easily obtain. This creates the air jet. I then drilled the rest of the way with a drill the same size as the tube. Next I drilled diagonally in from the back to allow air to pass around the oil pipe to the air jet. The small tube is pushed right through and soldered in place. It projects about 1mm past the end of the jet. The whole lot is then pressed into the plastic nozzle on one of those cheap loc-line hoses. A small plastic pipe runs from the small tube in the jet, down the loc-line and out of a made-up block at the bottom. It sounds more complicated than it is.
I found the trick is to make sure the pipe down the middle projects past the end of the air nozzle. This way you get a stream of fine droplets in a cylinder of fast moving air. If the oil pipe is flush with the air outlet you get a fine mist that hangs in the air rather than going on the work. Note that I use a pressurized oil feed as this setup doesn't generate much vacuum. The pressurized oil is supplied with one of those cheap combined air regulator/filter and oiler units on eBay like item #250528218868. I took out the air filter bits and added a pipe fitting on the bottom of the water trap. The water trap now becomes the oil reservoir. The reservoir is only small but it lasts quite a long time as you only need a trace of oil. It pays to use oil designed for misters as it is less toxic than the usual cutting oils. The stuff I use is vegetable oil based and a gallon was damn expensive. However it will last many years. Les I used the smallest tube I could find. Gene Heskett wrote: > Greetings all; > > I find that I can get brass tubing in pretty small sizes, like 1/16" OD, > usually sized to be a slip fit in the next larger size, so this makes it easy > to solder up a small nozzle, with the far end built up to 1/4" for attaching > the air supply. > > Now, I'm wondering if there is a standard formula that would tell me the > exact geometry it would take to make a 2 tube, one blowing across the end of > the other with air, and the second pulling from a nearby quart of cutting > oil, in the same manner as the old hand pumped Hudson sprayers, to add a > slight mist of cutting oil to the air blowing on the mill? Angles, center > separations etc? I think I can just solder the tubing(s) to another small > piece of sheet brass to maintain the alignment. > ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
