National Instruments NI-Motion - Manual (Page 136)

Chapter 10 Electronic Gearing and Camming
NI-Motion User Manual 10-14 ni.com
Each row of data defines a gear ratio. The camming profile is repeated after
a camming cycle is completed. The master position is always interpreted
inside the modulus defined by the camming cycle.
For example, initially, the master axis moves from 0 to 1000. The gear ratio
used for this move is 1:1 because the master position is in the 0 to 2000
interval. With a gear ratio of 1:1, the slave axis moves at the same speed as
the master device to position 1000.
Figure 10-11 shows that the master position in this interval is inside the
modulus.
Figure 10-11. Master and Slave Positions at Enable
Figure 10-12 shows that if the master axis moves to position 2000, the gear
ratio does not change because the current master position is still inside the
0 to 2000 interval.
Figure 10-12. Master Axis Moves within Interval
Figure 10-13 shows that when the master axis moves to position 4,000, the
gear ratio changes to –0.5. The slave axis travels half the distance that the
master axis travels, and it travels in the opposite direction.
0 1000
Master
0 1000
Slave
0 1000
Master
0 1000
2000
2000
Slave