Darex V-390 - Manual (Page 11)

11
STEP 3: Sharpening the drill point
A. Push the Drill Sharpener switch to the ON ( | ) position.
B. Insert the chuck into the sharpening port. While lightly pushing
in and down, rotate the chuck clockwise in half rotation incre-
ments. The chuck will move in and out and the sharpening
port will slightly swing during this process. Let the
on the chuck dictate the natural in and out sharpening motion.
NOTE: The swing motion of the sharpening port is generated as
the geometry of the swing cam (See Picture #14) contacts and
rolls over the bearing which is located inside the sharpening port.
DO NOT LIFT THE CHUCK UP AS YOU ROTATE IT. The initial
grinding occurs when the geometry of the feed cam (See Picture
#14) rides against the in-feed cam bearing also located in the
sharpening port. Once the drill bit has sparked out, (grinding noise
reduced to a minimum) the sharpening is complete. Inspect the
drill point and if it does not have adequate relief see the next para-
graph. DO NOT REMOVE THE DRILL FROM THE CHUCK IF THE
POINT IS TO BE SPLIT.
About Relief Settings
After aligning and sharpening the drill bit, if the lip relief needs to
be increased or decreased, then follow step A or B.
A. Rotate the relief paddle from “0” to the “plus” side numbers,
#1, #2 or #3 to increase the relief setting. The further right the
relief paddle is positioned, the more lip relief the drill will have
after aligning and re-sharpening.
B. To decrease lip relief, move the relief paddle left, in the
“Minus” direction to the #1, #2 or #3 numbers. The further left
the relief paddle is positioned, the amount of lip relief will be re-
duced, once the drill has been realigned at the new setting and
reground. NOTE: The degree of the chisel edge angle is directly
effected by the amount of lip relief ground on the drill bit. Exces-
sive relief on a drill bit will rotate the chisel edge angle clockwise
and vise versa.
See Illustration 15
STEP 4: Splitting the drill point
You can split any drill point that the V390 is capable of
sharpening. See “Point Split Depth, Angle & Center Adjustment”
Detailed Instructions
TIP:
Swing
Cam
In- feed
cam
Pic 14
Ill 15
TIP:
When adjusting the Point
Split Port, make sure to
leave .002 to .005
between the split.
cams