On Mon, 09 Jan 2017 22:56:11 -0500, wrote:

On Mon, 9 Jan 2017 18:47:19 -0500, "Jim Wilkins"
wrote:

wrote in message
news
Greetings Clare,
I just thought a few minutes ago how a fuel injector might be a good
way to apply Minimum Quantity Lubrication to cutting tools. I figure
you or someone else here must know what the minimum amount of fuel
is
that can be delivered from a typical gasoline engine fuel injector.
Gasoline is thinner than the MQL fluids but maybe the injector
would
work anyway. The thinnest MQL fluids I use are water thin or pretty
close to water thin. The thickest has a viscosity camparable to or
slightly less than 5 weight motor oil. Actually less than 5 weight.
Maybe 5 weight and kerosene mixed 1/2 and 1/2. I can certainly
pressurize a liquid reservoir to the required pressure. Maybe a trip
to the wrecking yard for a ruel pump and some injectors is in my
future.
Thanks,
Eric

The minimum that the idling engine needs may not be the lowest the
injector can deliver. You can lower the pressure and experiment with
pulse widths too short to fully open the valve.
http://www.automotivetestsolutions.c...waveforms.html

The article mentions how the clamping voltage affects turn-off time.
There's a similar trick to decrease turn-on time, increase the driving
voltage and add a series resistor that keeps the steady-state current
through the coil the same. The higher voltage forces a more rapid
current rise through the coil at the start when inductance limits the
rate of change. I made a small relay close or open in half a
millisecond using these methods.

There are saturating and non-saturatinf injectors - saturating
injectors with peak and hold drivers give the best controp

If you measure the flow rate with the injector held open you can
estimate the effect of pulse timing.

Filters restrict fluid flow with less risk of clogging than a single
orifice.

-jsw

Greetings Clare,
I guess what I'll be doing first is to see if the injectors for a
Toyota Camry 4 cylinder will work. I'm not sure yet how I will measure
the quantity of lube delivered. I think that weighing a small
reservoir before and after might work. Maybe inject the lube into a
ballon and weigh it. I do have a scale that would work.
Eric