On Jun 21, 12:52*am, "Michael Koblic" wrote:
...
More recently I have been just applying Rapid Tap from time
to time (generally I have not been drilling big holes).

What does everyone use these days? Specifically, given the ability of
continuous flow of lubricant and its collection under the table (and
recycling??).
Michael Koblic,

I use as little as I can get away with to avoid cleanup. This
afternoon the channel iron drilled nicely dry, the welded hot-rolled
steel under it wanted oil and the tap received fancy tapping fluid.
The rest of the holes all got the tapping fluid for drilling as well.
The job is a sheet metal brake and cutting oil might get onto the
window flashing I'm making. http://picasaweb.google.com/KB1DAL

When I write that a tool 'wanted' something it means experience shows
how well it is cutting. I got that experience by starting dry, then
adding oil, then tapping fluid and observing the differences in chips,
handle pressure, machine sounds, bit & work heating, how fast it
dulled, and so on. Put a little oil on the bit and watch for subtle
changes when it's gone. If you are drilling a few holes at a moderate
spindle speed, cutting oil or coolant isn't really necessary.

Jim Wilkins