HM Machinery SBM 28B, Руководство пользователя, Страница: 10 / 76

The clamping devices must be clamped to the machine table.
The machine table is provided with “T” slots for such purpose.
5. TOOL FIXING
The tools generally used in this machine will have parallel or taper shanks. Drill holders
are normally used to fix the main spindle of the machine to the parallel shank tools. This
fixing device is used for small drill diameters (max. up to dia.16mm). Bigger diameter drills,
usually have taper shank of Morse taper (the ones of smaller diameters than 16mm can
also have taper shanks).
The housing in the main spindle to insert the tool is of Morse taper type. It is very important
to insert the tool taper correctly in the main spindle taper to avoid the tool falling from its
housing when turning and provoke an accident. The coupling system itself of the tool male
taper in the female taper of the main spindle is auto-locking, but for it to work the surfaces
of the tool taper and spindle taper must be in contact. To get the best possible contact, the
surfaces of the tool taper as well as the spindle taper should be in good conditions.
Therefore, it is advisable to handle the tool as well as the spindle of the machine carefully.
6. CHIPS DURING MACHINE
The machining process removes material from the piece. This material is released in
chips, which can be of different shapes depending on the material itself. The most
common ones are of three types: fragmented chips in small bits, short helicoidal chips and
long helicoidal chips.
The chips fragmented in small bits can be rejected from the machining area and can be
dangerous if they reach the eyes of the operator. To avoid this, it is advisable to wear
safety glasses.
The long helicoidal chips tend to roll up the tool and gain considerable volume before
breaking, which is dangerous if they reach the operator, as they may produce injuries.
The reached volume may also displace the drill protector from its security position,
increasing the risk of an accident. It is advisable to use chip breaking tools to machine
materials which produce such chips. For further information contact the tool manufacturer.