TOMATECH AUTOMATION
position of ns, nf block in G70～G73 blocks are as follows:
Command specifications:
● ns～nf blocks in programming must be followed G70 blocks. If they are in the front of
G71 blocks, the system automatically searches and executes ns～nf blocks, and then
executes the next program following nf block after they are executed, which causes the
system executes ns～nf blocks repetitively.
● F, S, T in ns～nf blocks are valid when executing ns～nf to command G70 finishing
cycle.
● G96, G97, G98, G99, G40, G41, G42 are valid in G70;
● When G70 is executed, the system can stop the automatic run and manual traverse,
but return to the position before manual traversing when G70 is executed again, otherwise,
the following path will be wrong.
● When the system is executing the feed hold or single block, the program pauses after
the system has executed end point of current path.
● G70 cannot be executed in MDI, otherwise, the system alarms.
● There are no the same block number in ns~nf when compound cycle commands are
executed repetitively in one program.
● The tool retraction point should be high or low as possible to avoid crashing the
workpiece.
3.20.5 Axial grooving multiple cycle G74
Command format: G74 R(e) ;
G74 X(U) Z(W) P(Δi) Q(Δk) R(Δd) F ;
Command function: Axial (X axis) tool infeed cycle compounds radial discontinuous
cutting cycle: Tool infeeds from starting point in radial direction( Z), retracts, infeeds again,
and again and again, and last tool retracts in axial direction, and retracts to the Z
position in radial direction, which is called one radial cutting cycle; tool infeeds in axial
direction and execute the next radial cutting cycle; cut to end point of cutting, and
then return to starting point (starting point and end point are the same one in G74),
which is called one radial grooving compound cycle. Directions of axial tool infeed
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