Specialized Concentrated Focused
Operation
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27
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Coarse Positioning Stage
A
B
C
’
C
D
4
3
2
1
Distance
Legend:
2
Stop position after receiving signal
3
Enter into signal zone reversely
4
Leave signal zone reversely
Arrow tip indicates the machine stop position
1
Initial stage
C
o
a
rs
e
p
o
s
it
io
n
in
g
s
ig
n
a
l
b
e
lt
Fig. 3-9 Sketch map of coarse positioning (stopping within the signal belt after receiving coarse positioning signal)
C
o
a
rs
e
p
o
s
it
io
n
in
g
s
ig
n
a
l
b
e
lt
C
’
C
D
A
B
4
3
2
1
Distance
Legend:
2
Stop position after receiving signal
3
Enter into signal zone reversely
4
Leave signal zone reversely
Arrow tip indicates the machine stop position
1
Initial stage
Fig. 3-10 Sketch Map of Coarse Positioning (Stopping out of the signal belt after receiving coarse positioning signal)
1) When the machine keeps moving until receiving origin signal at place A, it should stop immediately ,
but it may stop at place C or C‟ due to time lag and inertia.
2) The machine will keep moving reversely at one third of coarse positioning speed until receiving
origin signal (if the machine has stayed within the signal belt in the above step 1, it will make no
motion in this step).
3) The machine will keep moving reversely at one-ninth of coarse positioning speed until the origin
signal disappears (across the signal belt).
4) The machine will halt at the flag place D after the end of this stage.
Fine Positioning Stage
The process of fine positioning stage is identical with that of coarse positioning stage.
After coarse positioning, the machine will move to encoder origin rapidly, executing slow positioning
several times.
