A COMPANION MACHINE
TO THE OLIVER DRILL POINTERS TO IMPROVE DRILLING EFFICIENCY
thin webs to proper
thickness
correct webs that
are off center
correct out of index
flutes
add chip breakers
The best of drill points lose a lot of
their proven advantages if poor web thinning is incorporated in the tool. If the
thinning is done by hand and one flute is ground a little deeper than the other, you
immediately have a drill point with cutting lips of unequal length. Mechanical
web thinning generally is not much faster than hand thinning but it does create equal
conditions for both cutting lips of the drill. Thus, the drills perform for a
greater length of time and overall thinning operations required during the year are
reduced.
The web thickness of a drill increases
as the drill is re-sharpened. If the drills are not too badly worn when they come to
the cutter grind department for resharpening, you can generally get 3 or 4 resharpenings
to each thinning operation. Proper web thinning will reduce the amount of torque
required for the drilling job. Also, the reduction in end pressure will cause less
damage to the chisel angle area of the drill point.
During the operation of the machine,
care is only taken for the setup used for grinding the first flute. After you have
achieved the desired results on the first side, the drill is simply indexed 180 degrees
and the column is gradually fed back to the “0” mark once again to give the same
grind in the second flute to assure continued drill point accuracy. Because of our
unique dressing method, one size and thickness of grinding wheel will generally handle all
sizes of drills up to 3” diameter. |
