mist, spray, flood or drip ?

Hi all,

I am drilling holes in 6061-T6 aluminum.
3/64 holes 0.25" deep.

I am drilling through a drill bushing into the part.

My set-up does not easily allow flood cooling, but I know some form
of cutting oil and cooling will extend my drill bit life.

RANT: no one makes cheap sharpeners for tiny drills.

I was thinking of a drip application on each withdrawal of the bit
when it comes up for chip clearance.

I do have compressed air, 30 psi that I use on the pneumatic clamp so
I may be able to use that. and I have 90 PSI at the tank if that is
needed.

I had thought that a piston or switch on withdrawal might offer a
pulse to signal a drip or blast.

Any suggestions for some sort of metering device ?

Dave