https://www.harborfreight.com/2-1-2-half-gallon-pressure-paint-tank-66839.html
https://www.harborfreight.com/air-tools-compressors/air-spray-guns/hvlp-lvlp-spray-guns/64-oz-professional-hvlp-air-spray-gun-kit-62895.html
This is what i was talking about. I have both a similar pressure pot
for paint and the exact spray gun and pot.
All these do is create pressurized fluid at whatever PSI you set on the
regulator.
If you use one of these with a fast solenoid valve and an orifice, you
can meter fluids out fairly precisely.
Their air use is insignificant, unless the pot leaks.
Another thing you could do is to use a drip feed into a line. Use a
needle valve or tube pinch valve to regulate a gravity flow of fluids.
Think IV medical fluid feed.
If you could find an IV feed pump you might be all set! (Ebay ??) :-)
Dave
On 10/23/2019 4:44 AM, Gene Heskett wrote:
On Tuesday 22 October 2019 22:23:05 Dave Cole wrote:
I'm surprised your not using a pressure pot to spray the coolant.
You could put an electric valve on the output and pulse it on and off.
Harbor Freight has a cheap pressure pot/spray gun setup. Just use the
pot. Sometimes low tech is good. :-)
Dave
I was at the hf store in Buckhannon a week ago and wandered around
looking for something I could use, but the only thing I saw would have
used a gallon an hour. Way too much. My target is about a 5 to l0 lb
blow, carrying half a cc a minute or less. I figure with this pump,
being stroked by the pwmgen, I can turn it maybe 1 or 2 revs a minute.
But since the servo period is a millisecond, I can't pulse it at
4kilohertz, as I wrote earlier, but at a minimum of 1 khz. Banging it
for a millisec every 50 millisecs ought to be in the usable range. But
we'll see. Dry, and hooked to 12 volts, I'd guess it runs about 1.5 rps.
That would drain the 8 oz coke bottle in 20 minutes and flood the table
making a mess. So its got to slow down, a lot. It apparently has a
planetary reduction in it, my guess is at least 10/1. I'd like the mist
to be almost self drying. Air consumption will be a problem too as its
only a cheep 2 horse, 8 gallon compressor. Direct drive, noisy. Needs an
input muffler. I don't figure it can run 50% of the time and survive an
hour.
I found a motor driver, s/b 2 of then here next Monday, so the suspense
will be replaced by making a smaller nozzle for the flex hose. writing a
bit of hal code and making it work better than what I've got now...
Thanks Dave.
Cheers, Gene Heskett
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