Darex 4700 Plastic and Wood Point Drill Sharpening Attachment - Manual

Grinding Cutting Edge To a Negative Rake
(For drilling composites, plastics and soft materials.)
1. Upon completing the sharpening of the drill point -
loosen the drill in the chuck. Put the chuck in the set-
ting fixture and put chuck arrow at the 90 degree
mark on the clamping band and tighten drill in the
chuck.
2. Unlock point splitter chuck holding fixture lever -
rotate fixture counterclockwise so that the "V" mark
on fixture is approximately 1/16" to the left of the "D"
mark on the bronze compound.
3. Turn cross feed knob so point splitter compound
moves to the point approximately 1/2" from the origi-
nal point split setting - locating the drill point center
at the right edge of wheel.
4. Rotate the chuck so that the cutting lip points
straight down and is parallel to the side of the wheel.
( See fig.3 )
5. Adjust the cross feed knob carefully so a very small
amount of the cutting lip is ground off - leaving at
least 50% of the margin.
6. Noting the location of the chuck arrow at the clamp-
ing band, loosen band lock, rotate chuck 180
degrees, so the opposite arrow comes to that same
band location. Lock band down and tip drill down to
grind the other lip.
Note: Depending upon what type of material being
drilled, you might want to experiment with differ-
ent negative rake angles. To change this angle go
back to line "2" and reset fixture.
Plastic and Wood Point
(60 to 90 Degrees)
1/16” through 1/2” ( 1.5 - 13 mm)
Drill Sharpening Attachment
(DAREX Part # 4700)
Installation and Operating Instructions
Installation
Loosen and remove the wing nut. Lift the standard
sharpening fixture off of the compound and install the
4700 attachment. The 118 mark on the compound will
be the pointer for what setting you need for the 60 or the
90 point angle. ( see fig 1)
Operating Instructions
1 Insert drill loosely into chuck and insert the chuck in
the alignment fixture. Rotate the chuck clockwise
until the arrow on the chuck meets with the 60 to 90
point angle arrow on the clamping band. Tighten the
knob on the chuck. ( See fig. 2 )
2 Sharpen the drill as normally done. (The relief on
this sharp of a point angle will not be as defined as a
flatter angle drill bit.)
Figure 1
Figure 3
Figure 2