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Application Example: Continuous Cutting of Moving Webs by Waterjet
A moving sheet of plastic must be cut with a water jet along the pattern shown below. The
process is continuous and the web does not stop.
WEB
MOTION
Y
X
Continuous Cutting Example
Operation
The unique feature of this system is that the plastic sheet moves continuously and
independently at a variable speed. As a result, the motion of the X motor must equal the sum of
two parts: motion 1 to follow the cutting pattern, and motion 2 to follow the moving web. This
can be accomplished easily with the controller by separating the two moves. Part 2 is done by
electronic gearing and part 1 is done by coordinated motion. The web motion is monitored by
an independent encoder whose output is applied to the Z axis. Assuming
that the resolution of all 3 encoders are the same, the X motor is then required to follow Z at a
ratio of 1 to accomplish part 1 of the motion. The cutting cycle is shown below.
D
(-3400,7000)
C
(-3400,1000)
E
(-1400,7000)
F
(-1400,1000)
B (-2400,0)
A(0,0)
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