Ball Bearing Screw
A ball bearing lead screw converts the rotation
of the motor to the linear motion of the Z-axis.
In lead screw transmissions, the screw is rotated
by the motor, and the shaft is connected to the
nut, or sleeve, as illustrated in Figure 6-12. In
the SCORA-ER 14 the screw rotates and the nut
travels along the length of the screw.
As shown in Figure 6-13, a ball bearing screw
thread is actually a hardened ball race. The nut
consists of a series of bearing balls circulating in
a similar race. The bearing balls are transferred
from one end of the nut to the other by return
tubes.
The low-friction ball-bearing lead screw
provides more accurate and enduring
performance.
The lead screw used in the SCORA-ER 14 has a
16mm lead. That is, for each rotation of the
screw, the nut travels a linear
distance of 16mm.
The lead screw of the SCORA-ER 14
is fitted with a brake which halts
motion of the Z-axis when motor
power is cut off.
Figure 6-12: Lead Screw
Transmission
Figure 6-13: Ball Bearing Screw
User’s Manual 6 - 9 SCORA-ER 14
9603
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