
4.AUTOMATIC OPERATION OPERATION B-63784EN-1/01
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4.13 MANUAL HANDLE INTERRUPT
In automatic operation, this function allows a move command
generated by the manual pulse generator to be superimposed on a
programmed move command. As a result, the actual tool path deviates
from the programmed path by the amount by which the operator turns
the manual pulse generator. Therefore, this function can give the
operator an additional margin in machining.
Explanations
- Interrupt operation
(1) A manual handle interrupt can be accepted in modes other than
the positioning mode (such as G00).
Even in a block that does not move the tool or when automatic
operation is in the stopped state, a manual handle interrupt can be
accepted unless the positioning mode is effective.
NOTE
- Even if the feedrate override signal is set to 0%, a
manual handle interrupt is accepted.
- In positioning mode, the tool moves at the rapid
traverse rate. Therefore, commands such as G28 and
G29 can also be considered to be positioning mode.
(2) For how to select a target axis for manual handle interrupt, refer to
the manual provided by the machine tool builder.
(3) The speed during manual handle interrupt is the sum of the speed
in automatic operation and that of movement by manual handle
interrupt. The speed, however, is controlled so as not to exceed
the upper cutting feedrate on the axis.
Example
Suppose that the upper limit of the cutting feedrate on a
given axis is 5 m/min. If the tool is moving along that axis in
the positive direction at 2 m/min, the manual pulse
generator can be turned to set up to 3 m/min. When the
same movement is interrupted by turning the generator in
the negative direction, up to 7 m/min is possible.
If the manual pulse generator is turned in beyond the
limit, the excess pulses generated from the generator
are discarded. Consequently, the reading of the pulse
generator disagrees with the actual traveled distance
made by the interrupt.
(4) Refer to the Manual of MTB for the magnification used in the
manual handle interrupt.