Ergonomics - Atlas Copco

140
applied to the center of the drill bit in order to
penetrate the material. At the point of pen-
etration there is a dramatic fall in the amount
of feed force required. An experienced operator
hears when this happens and reduces the feed
force accordingly. If he doesn’t, the drill bit
will penetrate a much thicker layer which may
halt its process. The stall torque will build up
rapidly, faster than 300 ms and, in principle,
there will be a shock.
The stall torque for this drill is 1 Nm.
Although the hand-arm system can easily
cope with this torque, a skilled operator
can avoid this situation. For larger drill bit
sizes, it is recommended to drill a hole with
a smaller bit first, thus avoiding the shock
situation. The score is 0.
VIBRATION
The vibration from the machine itself is
very low. During the drilling process it
can be higher if the machine is used with
a bent drill bit. The condition of the bit is
an important factor, both for the quality of
the hole and for the vibration emitted. The
declared vibration value is