Darex V-390 - Manual (Page 12)

12
diagrams (page 12 & 13) to help you understand split point drill bit
geometry.
A. Once the drill is sharpened, do not remove it from the chuck.
Align the Point Split Tab Notch, on the chuck, with Point Split Tab
on the point split angle adj.
bracket. (See Picture # 16
& 17a & 17b) Make sure
chuck is held in-line and
square with the face of the
point split port.
B. Slide the chuck into the
grinding wheel for a “one
count” pull the chuck out of
the split point port , about
1/2 inch and rotate it 180
degrees. Repeat “B”.
C. Use the point split port depth adjustment knob
to feed the drill
bit into the wheel (See Picture #18) to increase the depth of split.
Point Split Depth Adjustment:
What to do if the drill point is split too much or too little:
The point split depth is adjustable. The point split port depth adj.
knob is located at the rear of the point split port. (See Picture #18)
If the split point is incorrect a slight adjustment under the following
notes will need to be made.
x Drill point is split correctly: (See Diag ”A”) Use the posi-
tion of the “split line” on the right side of the drill bit as the ref-
erence line. Compare the position of the right “split line” to the
left “split line”. If the “split line” on the right is lower than the
“split line” on the left, the drill bit is under-split or split too lit-
tle. (See Diagram “B”) If the “split line” on the right is higher
than the “split line” on the left, the drill bit is over-split or split
too much. (See Diagram “C”).
x Drill point is split too little: (See Diag “B”) Turn the point
split port depth adj. knob counterclockwise, (unscrew). Each
mark on the sleeve of the knob will move the drill .002”. Rotate
the adjustment knob one half of a line, at a time, in the point
split adjustment process. Re-split the point, then check the re-
sults.
x Drill point is split too much: (See Diag “C”) The drill will
need to be realigned and re-sharpened prior to adjusting.
Once the drill is re-sharpened, turn the point split adjustment
knob clockwise approximately one full turn. Insert the drill into
the point split port and split both sides of the drill. Inspect the
drill point. If the split is now not deep enough then rotate the
adjustment screw counterclockwise (unscrew), one half of a
line. Re-sharpen, then split the drill point again and check to
see if split is correct, if not, adjust accordingly.
Machine Adjustments
Point Split
Tab Notch
Alignment
Pin Slot
Pic 16
Point Split
Tab
Pic 17a
Pic 18
Diag A
Diag B
Diag C
Split
too
little
Split
too
much
Split
lines
Correct
split
Notch
Tab
Pic 17b