Tuning Mechanically Linked Axes
Method 1: Tune individually, then as system
Tune the cylinders individually while not connected to the mechanical system. Make sure to tune very conservatively, because if you tune it too aggressively (high gains), the system can have problems when connected to the mechanical system
Connect the cylinders, then send simultaneous moves as you continue to tune the system.
Method 2: Tuning as a linked system
Setting the Proportional gain very low on each axis, and do very short, simultaneous moves.
As you increase the Proportional gain, you should see the control improving. As the control improves, make the moves longer.
Make similar adjustments to the gains on all the cylinders to keep them tracking roughly the same position.
You can use the Send All button in the Command Tool to send command simultaneously.
Once you have obtained some initial control, you can use the Tuning Wizard with Existing Plot and choose gains with the Gain Calculator. If you have identical cylinders and valves on each axis, which is usually the case, you can do this on just one axis, and then anytime you change gains, make sure to write the same gains to the other axis before doing the next move