BGS technic KG
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D-42929 Wermelskirchen
Tel.: 02196 720480
Fax.: 02196 7204820
mail@bgs-technic.de
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USE
1. First, select the desired grinding angle by using the thumbscrew (12) according to the intended use
of the drill bit:
59° - general use
88° - thin materials, prevents tearing
68° - for thin drill bits with fast feed
49° - for soft metals such as copper, lead, soft alloys
41° - for countersinks
2. Loosen the feed slide (6) with the screw (7), turn back the adjustment screw (4) completely and
then insert the drill bit. The bit must protrude beyond bit tray tip (14) with its point
at a dimension equal to its diameter.
3. Now firmly tighten the feed slide lock screw (7) and the attachment screw of the
attachment (1) sightly, only enough that the drill bit is just held. Make sure that
the spiral groove of the drill bit rests against the stop.
4. Loosen the wing nut (8) in the foot of the drill grinding attachment and move the
attachment in order to achieve a offset of the drill point of approx. 0.5 mm from
the grinding disc. Tin doing so, the bit tray tip (14) must be positioned precisely
vertically in front of the grinding disc.
5. Slightly loosen the control screw (5), switch on the grinding machine and push the drill bit forward
by turning the adjustment screw (4) until the drill bit touches the grinding disc. Then swing the
entire attachment (hold at the feed slide)
to the right
. This will automatically create the correct cut.
View from above
As the swing axis (11) is not exactly situated in the centre of the bit tray (2). This “inaccuracy”
effects right edge grinding and relief grinding. Therefore you have to swing the swing axis (11) to
the right only.
Depending on the degree of wear of the drill bit, push the drill bit further forwards by using the
adjustment screw (4). However, this should be done slowly in order to prevent the drill bit from
overheating and becoming annealed soft.If longer grinding is necessary, take breaks for cooling
down. After grinding one side of the drill bit, screw the control screw (5) tightly. This defines the
same position for the other flank.
6. Loosen the lock screw of the attachment (1) and take out the drill bit. Turn it, so that now the other
flank rests against the stop. Turn back the adjustment screw (4) and repeat the grinding process
for this flank. If the drill bit is heavily worn, repeat the grinding process.
If this still does not achieve the desired appearance of the drill bit point, repeat the grinding with the
drill bit pushed out further beyond the stop (by more than one drill bit diameter). See further
instructions about the correct sharpening of drill bits in the chapter below.
Grinding Disc
Do not swing!
Swing
