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Installation manual
CNC 8055
CNC 8055i
7.
CONCEPTS
SOFT: V02.2X
Axes and coordinate systems
7.1.5 Tandem axes
A tandem axis consists in two motors coupled to each other mechanically making up a single
transmission system (axis). It is normally used to move the axes on large machines.
The CNC only displays one axis (referred to as master axis) whose movements are programmed.
The other axis is called slave axis.
The following aspects may be pointed out in this configuration:
• A tandem axis helps provide the necessary torque to move an axis when a single motor is not
capable of supplying enough torque to do it.
• Applying a pre-load torque between the main motor and the slave motor reduces the backlash
of the axis.
• Greater rigidity is obtained on long leadscrews when applied to a rack-and-pinion system.
One of the many applications for the control of a tandem axis has to do with Gantry machines.
(A)Main or master motor. Besides generating torque, it is in charge of positioning.
(B)Slave motor. It only supplies torque.
Example of a tandem axis made up of a rack-and-pinion system driven by two motors.
Example diagram of a Gantry machine with two axes in tandem.
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