"Roger Shoaf" wrote in message
...

"Michael Koblic" wrote in message
...



Drilling 1/4" holes 0.075" apart is well beyond my skill level.


Did you mean .075" apart or .750 inches apart?

If you wanted the slot .250 X .325 then what you do is to center drill and
drill an under size hole, swap to the end mill (2 flute or 4 will work
fine
and enlarge the hole to size.

Next unlock your table, turn your crank .010", Loch the gib and plunge.
Repeat toll you get to the end and then use a smaller diameter end mill to
cut off the little tits between the plunges.

This should yield a perfect slot even with a shaky machine.

Worth trying.
Do you feel that there is an incremental benefit in this method rather than
just making 8 passes of 0.075" from the initial hole increasing the depth by
0.050" each time?

--
Michael Koblic
Campbell River, BC