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CNC Operation
5
REMARK A datum shift cannot applied, edited or cancelled unless the "Backtrack" or
"Return" button is released.
b
c
R1
Rn
d
e
a
P
Dat
a , b, c, d, e: Programmed tool path
P: Tool stop point (machining interrupted)
Dat: Tool/workpiece datum shift (optional)
R1 to Rn...: Backtrack along path
Resumption of programme execution
If no tool/workpiece datum shift is applied (or if the shift has been cancelled), machining can be resumed upstream
("Backtrack" and "Return" buttons released), i.e. the machining interruption can be cancelled (the "CYHLD" indicator
in the status window goes out) and programme execution can resumed in the current mode by pressing "CYCLE"
(during resumption, a new machining interruption can be requested by pressing "FEED STOP").
Number of blocks stored during backtrack along path
The number of blocks (maximum 100) on which backtrack can be executed is declared in word N1 of machine
parameter P114 (see Parameter Manual).
Restrictions on use of backtrack along path
It should be noted that:
- Only the functions related to axis movements are stored (G0, G1, G2, etc.) for backtrack, but not the other functions
(M, T, S, etc.).
- The user cannot (even if the storage capacity allows) backtrack along the path beyond the point where the tool in
use was called.
- The rigid tapping, rigid tap removal, inclined plane, RTCP and block skip functions cancel the remainder of the
blocks stored and therefore stop execution of backtrack along path (the same is true for smooth polynomial
interpolation).
- Sequenced thread cutting (G38) is performed as a linear interpolation (G1) during backtrack and return along path
or programme resumption (see above).
Tool offsets
Dynamic tool offsets can be applied at any time to the current tool offset of the axis group, provided they are less than
0.1 mm. This offset is applied immediately in the block being executed and over the complete stored backtrack path.
Backtrack/return with multiple axis groups
With multigroups, backtrack and return are possible only for the first axis group.
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