14. FUNCTIONS TO SIMPLIFY
1 While the values ∆i and ∆k, or ∆u and ∆w are specified by
address U and W respectively, the meanings of them are
determined by the presence of addresses P and Q in G73
block. When P and Q are not specified in a same block,
addresses U and W indicates ∆i and ∆k respectively. When
P and Q are specified in a same block, addreses U and W
indicates ∆u and ∆w respectively.
2 The cycle machining is performed by G73 command with P
and Q specification.
The four cutting patterns are considered. Take care of the
sign of ∆u, ∆w, ∆k, and ∆i.
When the machining cycle is terminated, the tool returns to
After rough cutting by G71, G72 or G73, the following command permits
G70P (ns) Q (nf) ;
(ns) : Sequence number of the first block for the program of
(nf) : Sequence number of the last block for the program of
1 F, S, and T functions specified in the block G71, G72, G73
are not effective but those specified between sequence
numbers “ns” and “nf” are effective in G70.
2 When the cycle machining by G70 is terminated, the tool is
returned to the start point and the next block is read.
3 In blocks between “ns” and “nf” referred in G70 through
G73, the subprogram cannot be called.
Finishing Cycle (G70)