12. FUNCTIONS TO SIMPLIFY
PROGRAMMING
B–63172EN/01
NC FUNCTION
72
When the drilling axis is Z axis, machining data in the canned cycle is
commanded as follows:
Gff X_ Z_ R_ Q_ P_ K_ F_ ;
Drilling mode Gff ; See previous table.
Drilling position dataX ; Command position of the hole.
Z : Specify hole end position shown in the previous table.
R : Specify R point position shown in the previous table.
Q : Specify cutting quantity with G73, G83, and shift quantity with
G76, G87,
P : Specify dwell time at the hole bottom.
K : Specify how may times to repeat.
When specified K0, drilling data will be set, but no drilling will
be done.
F : Specify feed rate for cutting.
By specifying G99, return point in canned cycle is specified to R point.
The drilling starts from the end point of the previous block. If the previous
block has ended in the initial point, it begins from the initial point and
returns to the R point.
Example) When G81 was commanded under G99 mode
Initial level
R point
Cutting feed
Rapid traverse
By specifying G98, return point in canned cycle is specified to the initial
level. The drilling starts from the end point of the previous block. If the
previous block has ended in the R point, it begins from the R point and
returns to the initial point.
Initial level
R point
Cutting feed
Rapid traverse
Format
Explanations
D R point level return (G99)
D Initial level return (G98)