On Friday 22 March 2019 12:28:46 Ken Strauss wrote: > > -----Original Message----- > > From: Gene Heskett [mailto:ghesk...@shentel.net] > > Sent: Friday, March 22, 2019 12:14 PM > > To: emc-users@lists.sourceforge.net > > Subject: Re: [Emc-users] mister nozzle shape > > > > And I've been cogitating on how to restrict the fluid flow, so > > haven't made any chips yet. Lack of the ability to bore very fine > > threads below nominally 10mm discourages me from attempting a needle > > valve design in some 1/2" thick brass bar I have is driving me > > toward a pinch the hose idea since the hose is so small anyway, I'm > > thinking of drilling and tapping into the motor mount, a couple > > 3mm.7 tapped holes 8mm or so apart, and making a flat piece with > > matching clearance holes, clamping that teeny hose between them and > > drawing it down with hex head cap screws to pinch it down to a red > > hair. Pressurizing the coke bottle takes care of priming the system > > and I can drill into the mount body to get that air easily enough. > > It will bleed back out of the bottle, and I can extend the inner > > nozzle to deliver what liquid does get thru the pinched section to > > roughly the middle of the annular air running at maybe 10 psi. > > > > That way any particulates that get thru the sintered bronze filter > > on the end of the feed line in the coke bottle will hopefully not be > > so coarse as to block off the pinched area, AND theres nothing to > > corrode over time. Might have a cold flow problem with the hose, > > requiring a pinch adjustment occasionally, but thats to be fiddled > > with when its encountered. > > > > Anybody see any showstoppers?? > > Is there some reason not to use a commercial pneumatic needle valve? > Perhaps not the best price nor quality but something like: > https://www.amazon.com/Clippard-PQ-FV04-Plastic-Control-Tubing/dp/B01A >63TGA0/ or > https://www.amazon.com/Pneumatic-Connect-Fitting-Control-Degree/dp/B07 >L9ZGRTS/ They are available for various tubing sizes and NPT sizes.
Either one would do the job at $16 copy. In looking for brass versions, I found quite a few, nearly all at $70 and up to nearly $300 for higher pressure stuffs. And if I had some brass stock for the screw I could make it, but steel screws would just rust and clog. So I changed to a pinch the hose idea, which I'll do this afternoon. I can do that with a 1/2x3/4 piece of 1/8 alu panel scrap and a pair of 3mm.7 cap screws I already have a box of. Probably cold flow problems with the plastic hose, but no long term corrosion to deal with. > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
