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2.5.1
Setting up the drill attachment Grinding Unit
Loosen the locking screw (17) and turn the arm (1) so that the nut (13) can be unscrewed and the shaft (10)
taken out of the drill grinding unit and put into the machine, where the shaft (10) is inserted so that the
threaded section is turned away from the machine. Then tighten the Allen screws. Put the compression
spring (11) onto the shaft (10) (position the spacer (34) on the shaft at PSD 5) and put the rest of the drill
grinding unit on the shaft (10). Attach the protective cover (12) and thrust bearing (20), and finally tighten
the nut (13). 1 Allen key (34) is included in the kit. Insert the Allen bolt (19) from the front, and then tighten it
(19). The arm (1) of the drill grinding unit B must be adjusted so that +/- (31) lines up with the markings on
the arm (1).
2.5.2 Positioning the drill grinder
Loosen the adjustment screw (7) and completely unscrew it. Then loosen the clamping screw (16), place
the drill in the V-groove, and push the clamp (5) forward to touch the drill. Tighten the clamping screw (16)
again.
Now use your thumb to turn the drill to the right so that one cutting edge of the drill touches the outer
side of the stop (8). Use the adjustment screw (7) to make fine adjustments to the position. Pick the drill
up and start the machine.
2.5.3
Grinding
Take the arm (1) in your hand and loosen the locking screw (17). Then turn the arm (1) back and place the
drill in the V-groove, holding it down with your thumb while at the same time turning it forwards.
Turn the arm (1) with your other hand using rapid movements (reduces blueing) from one end position to
the other, and then use your fingers to turn the drill 180°. Repeat these movements until there are no
more sparks, then adjust the adjustment screw (7) and continue the interactive grinding of the blades.
Repeat this until the bit achieves the correct angle.
Only bits with symmetrical tips can drill holes at the desired position, and you must therefore finish by
fine grinding both blades a few times until there are no more sparks, and without performing tightening
actions using the adjustment screw (7).
2.5.4 Angle of the drill grinder
Angle of the tip:
Chisel edge angle: Perform grinding so that the chisel edge angle is approximately 55°.
See Fig. II
Clearance angle:
For bits over 25 mm it may be necessary to reduce the length
(see Fig. IV), as a large chisel edge places a large load on the drill.
Always keep the V-groove as clean of grinding dust as possible. Ensure there is good working light. Follow
standard safety rules and regulations for grinders. Avoid unnecessary heating of the bit tip when grinding,
e.g. by keeping the grinding wheel true and using a visible grain.
2.5.5
Using a diamond to true the grinding wheel
Loosen the Allen bolt (19) and tighten the locking screw (17). Loosen the nut (13) and use the round finger
nut to set the stop (8) for the bit to approximately 5 mm from the grinding wheel.
The drill grinding unit is for grinding bits with tip angles of 116-118°, which are
those most frequently used. The angle of the tip cannot be changed by adjusting
the drill grinder unit.
Generally speaking, the clearance angle should be 6-8°. See Fig III. As stated
previously, it will be larger if the stop is
more than 1-1.5 mm from the grinding
wheel. If the clearance angle is to be
changed, the arm can be adjusted
using + or -.
of the chisel edge
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