On Sunday 15 November 2009, Leslie Newell wrote: >Hi Gene, > >>almost exactly the same as an air brush gun, where the liquid >> comes out of the center. So that center tube feeding in the oil is >> surrounded by by the air exiting through the gap between the OD of that >> tube and the drilled holes walls. > >Yup. The tricky bit is finding the right drill diameter. You only need a >very small gap otherwise you end up using LOTS of air. With a small gap >you can use a higher pressure and most of the flow is then air dragged >in by the high velocity air stream. > >A better way may be to drill the other way round. A big hole followed by >a smaller hole that is the jet size. The oil tube is then fitted through >a star shaped insert that fits in the larger hole. The air travels >through the gaps in the star. Slightly more complicated but it reduces >the restriction on airflow so again you can decrease the jet gap and >increase efficiency. Mine uses a fair amount of air and the compressor >kicking in on a fairly regular basis can get annoying. > > >Oh yes, I forgot to mention you really need a needle valve and one-way >valve in the oil line. If you don't have a one-way valve the oil drains >back and takes a while to start flowing next time you turn on the air. I >used 4mm nylon pipe from the oil reservoir to the mister. You can buy >4mm push fit needle valves and one way valves designed for pneumatics. > That latter I haven't found yet.
Starting with some tube that was .093 OD, I drilled the next size bigger drill bit about 2/3rds through a small block of brass. This looks usable although I'd druther see a smaller air gap. I haven't drilled the side hole for the air inlet yet, need to go see what size of tubing I can find, in between getting an oil leak looked at on the wifes car. I suddenly need two of me, life keeps getting in the way... >> Neat, and looks to be fairly rugged too. > >The thin inner tube is a little vulnerable but so far it has survived on >my lathe where it often gets wrapped up in swarf. I figure on milling this down to pretty small, so it can be aimed just by bending the air supply tubing. >> Good to know that the atomization can be overdone. > >Yes you want to keep atomization to a minimum. > >> pump, triggering it with a spare relay on the spindle controller, spindle >> running, get oil in the air. > >I use a solenoid valve on the air supply, driven from the mist coolant >output. I haven't stumbled over one of those yet... Thanks Les -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> Oh don't the days seem lank and long When all goes right and none goes wrong, And isn't your life extremely flat With nothing whatever to grumble at! ------------------------------------------------------------------------------ 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
