User Manual Chapter 7
GFK-1742F Jan 2020
Programmed Motion 212
7.7.9 Multi-axis Programming
Sync Blocks can be used in a multi-axis program to synchronize the axis motion commands
at positions where timing is critical.
Example 18: Multi-axis Programming
This example assumes that axis 1 controls vertical motion and axis 2 controls horizontal
motion. The objective is to move a piece of material from point A to point E as quickly as
possible while avoiding the obstacle that prevents a direct move between those points.
A simple way would be to move straight up from point A to point C, and then from point C
to point E. This sequence, however, wastes time. A better way would begin the horizontal
movement before reaching point C. It has been determined that after axis 1 has moved to a
position of 30,000, user units (to point B), axis 2 could then start and still clear the obstacle.
The program segment could be programmed as follows:
10: CMOVE AXIS1 30000, INCR, LINEAR
20: SYNC
PMOVE AXIS1 50000, INCR, LINEAR
PMOVE AXIS2 120000, INCR, LINEAR
When Block 10 is executed, axis 1 begins its 30,000-unit move while axis 2 pauses. When
the axis 1 move completes, two things occur: axis 1 begins the 50,000-unit PMOVE
commanded in Block 20 (SYNC) without stopping (because the first move was a CMOVE),
and axis 2 begins its 120,000-unit move. In the figure below, the axis 1 first move transfers
the part from point A to point B. At point B, axis 1 continues moving (performing its second
move) and axis 2 begins its move, bringing the part to point D. Axis 1 completes its second
move at point D and stops; however, axis 2 continues, and moves the part to point E.
Figure 90: Feedrate Override Example
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