Constant pressure is pretty easy and doesn't require a fancy hydrostatic pressure test setup -- just apply constant air pressure to the coolant tank and keep the exit hose under the surface of the coolant. Getting constant flow, which I believe is what Gene needs, is more difficult. Instead of a peristaltic pump he could consider a constant displacement pump. See https://www.youtube.com/watch?v=hyoLF8fZyfU for one example. There is some rather nice mill work in the video including mill turning. However, I can't understand how he does fine work with the heavy black gloves, I'm unsure why a two cylinder pump is required, it seems a mite overengineered plus I don't know how long the O-rings would last immersed in coolant. An interesting build nonetheless!
-----Original Message----- From: dave engvall <dengv...@charter.net> Sent: November 15, 2020 5:54 PM To: emc-users@lists.sourceforge.net Subject: Re: [Emc-users] I amazed me. Gene, Isn't it nice when things 'just work'. I presume you are familiar with pressure gage calibrators. That is a hydraulic cylinder of known area loaded by a known weight. At the low volume of coolant you need that might be a simplistic way to supply a known and constant pressure. It should be repeatable enough so you can predict when it will run out and need resetting. Just a WAT (wild ass thought). Hang in there. Dave On 11/15/20 1:05 PM, Gene Heskett wrote: > Greetings all; > > I got a pair of plates cut out to make motor mounts today, took about 1.5 > 8 oz coke bottles of diluted Kool Mist and several hours since I was > using a 1/2x1/2" SC uncoated 1/8" end mill. > > I did have to keep the spindle at 10k to stay above all the resonances > and general lack of rigidity in a 6040 mill and for some reason the > cutout is about 1/16" too big, but that's about the right room for a > layer of innertube to grip the motor better. Next I need to drill about > 4.5" deep for the mount bolts. Then, still using that same mill, cut the > caps off. > > The amazing part is that its still the same, was new, end mill I started > with, no breakage. Kool Mist is the cats meow! > > But I had to keep fiddling with the pump speed, I think the peristaltic > pump has a tiny crack, its outputting air bubbles its not sucking in. > And I need to experiment with a small air pump to drive the mister, even > at only a pound or so out of the regulator, its keeping my 2hp air > compressor too hot. I had junked a soldering station that lost its > control board, but kept the little diaphram air mover, which runs very > quietly, and it may be able to supply the mister air. Much quieter if it > can. > > The spindle motor is running w/o a water filter, and very little flow is > getting thru it, but it only got a bit uncomfortable in about 4 hours at > 10 grand. No smoke, yet... 2.2KW 4 bearing ER20 collet replacement on > order. From a US suppliers stock. > > Take care all. > > Cheers, Gene Heskett _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
