
4. DESCRIPTION OF PARAMETERS
B–63010EN/02
372
NOTE
If the specification of manual handle feed is such that the
rapid traverse rate will be exceeded, for example, when the
manual pulse generator is rotated at high speed with a large
magnification such as 100, the axial feedrate is clamped
at the rapid traverse rate and those pulses received from the
manual pulse generator that exceed the rapid traverse rate
are ignored. In such a case, therefore, the scale on the
manual pulse generator may differ from the actual amount
of travel. If such a difference is not acceptable, this
parameter can be set to temporarily accumulate the excess
pulses in the CNC, rather than ignoring them, up to the
specified maximum (pulses in excess of the set maximum
are ignored). The accumulated pulses are output and
converted to a move command once the feedrate falls below
the rapid traverse rate by reducing the rotational speed of
the manual pulse generator or stopping its rotation
altogether. Note, however, that if the maximum number of
pulses to be accumulated is too large, stopping the rotation
of the manual pulse generator does not stop feeding until the
tool moves by an amount corresponding to the pulses
accumulated in the CNC.
7120
Axis configuration for using the tool axis direction handle feed when tool axis
direction handle feed function
[Data type] Byte
[Valid data range] 1 to 4
When using the tool axis direction handle feed function, suppose that the
rotation axes for the three basic axes X, Y, and Z in the basic coordinate
system are axes A, B, and C, respectively. Suppose also that the Z–axis
represents the tool axis direction when the rotation axes are positioned to
the machine zero point. Then, depending on the axis configuration of the
machine, four types are available. For a 4–axis machine, types (1) and (2)
are available.
(1) A–C axis type
(2) B–C axis type
(3) A–B axis (A–axis master) type
(4) A–B axis (B–axis master) type
This parameter selects a type. Values of 1 to 4 are assigned to these types,
in order, from top to bottom. When the X–axis represents the tool axis
direction, the above types are changed to B–A axis type, C–A axis type,
B–C axis (B–axis master) type, and B–C axis (C–axis master) type.