Proxxon BSG 220 Operating Instructions Manual page 14

1. Insert drill 1 (Fig. 3) into the bore of clamp 2.
Let the drill shank protrude for approx. 10
mm at the rear so that it can be fixed in the
clamping prism. Do not yet tighten clamp
screw 3.
2. Lay drill 1 (Fig. 5) with clamp 2 into the
positioning prism, push forward against the
stop and align, as shown in Fig. 5 (cutting
edges vertical).
3. Slacken screw 3 and adjust adjustment bar 4
accordingly.
4. Fasten the drill in clamp 2 using Allen key 1
(Fig. 7).
Drills with diameter of less than 3 mm:
Drills with a diameter of less than 3 mm must be
clamped in the adapter 13 (Fig. 1) supplied for
this purpose.
Adapters for spiral drill diameters
1.5/1.6/2.0/2.4/2.5 and 3.0 mm are available as
accessories. In this case proceed as follows:
Insert drill 1 (Fig. 4) into the adapter 2 and fasten
with the Allen key 3. The shank of the adapter
has a diameter of 10 mm. Insert the drill with the
adapter into clamp 4. The machine must then be
adjusted as previously described for a drill with a
10 mm diameter.
Grinding the drill:
Danger!
Always wear goggles when performing
grinding work!
Wear only suitable working clothes (no wide
arms, ties, jewellery).
1. Turn knurled screw 1 (Fig. 8) in direction B to
open the positioning prism.
2. Lay the drill into the positioning prism and
insert a guide pin 2 of the clamp into the slot
3 in the swivel arm.
3. Turn knurled screw 1 in direction A to close
the positioning prism.
4. Fix the drill shank in clamping prism 5. For
this purpose press index knob 4, move the
clamping prism forward and slightly clamp
the drill shank with screw 6.
In case of small or too short drills clamping
with screw 6 (Fig. 8) is not necessary. In any
case ensure exact axial stop and guidance in
the clamping prism 5 (Fig. 8)!
Note!
5. Turn spindle 1 (Fig. 9) until the drill 2 slightly
contacts the grinding wheel 3. Read the
scale value 4 and turn the spindle 1 exactly
one turn back. The clearance between drill 2
and grinding wheel is now 1 mm.
6. Switch the machine on by the ON – OFF
switch 7 (Fig. 1).
Remember the position on scale 4 (Fig. 9)!
After grinding the first cutting edge the drill is
turned around in the positioning prism and at
this point it must have the same distance to
the grinding wheel as before the first cutting
edge was ground. Otherwise the drill will be
asymmetric.
7. Move the swivel arm smoothly and evenly to
the right against the stop while advancing the
feed spindle 1 (Fig. 10) slowly in direction B.
Repeat this process, until the cutting edge of
the drill is sharp.
A drill is normally correctly sharpened after 4-
5 swivelling movements. Remember the
position on the scale!
8. Return feed spindle 1 (Fig. 11) to the
previously remembered scale value 4.
9. Switch the machine off by the ON – OFF
switch 7 (Fig. 1).
10. Turn knurled screw 3 (Fig. 11) in direction A
and slacken clamp screw 2 so that the drill
can be removed from the clamp.
At this point do not loosen the clamp!
11. Turn the drill with the clamp for 180°, lay it
into the positioning prism and fasten it in the
clamping prism, as described for grinding the
first cutting edge.
12. Switch the machine on by the ON - OFF
switch 7 (Fig 1) and grind the second cutting
edge.
When grinding the second cutting edge stop
the feed at exactly the same position at which
the first grinding process was finished.
Otherwise the drill will be asymmetric.
12
Note!
Note!
Attention!
Attention!