17 Canned Cycles for Drilling
tool is to be withdrawn from the surface can be specified at addresses I, J or K. The control will interpret the addresses in conformity with the plane selected.
G17: I, J
G18: K, I
G19: J, K
Each address is interpreted as an incremental data of rectangular coordinates. The address may be a metric or inch one.
The mirror image, coordinate system rotation and scaling commands are not applicable to data of I, J, K. The latter are modal values. They are deleted by G80 or by the codes of the interpolation group. Withdrawal is accomplished in rapid traverse.
Data of drilling
Bottom position of the hole (point Z): Xp, Yp, Zp
The bottom position of the hole or point Z (in case of G17) has to be specified at the address of the drilling axis. The coordinate of the bottom point of the hole will always be interpreted in terms of rectangular data. It may be specified in inch or metric units, absolute or incremental values. When the value of the bottom point is specified incrementally, the displacement will be calculated from point R.
Fig.
The mirror image and scaling commands are applicable to the data of the bottom point. The latter are modal values deleted by G80 or by the codes of the interpolation group. The control will always approach point Z with the particular feed in effect.
Point R
The point of approach is specified at address R. It is always a rectangular coordinate data that may be an incremental or absolute one, metric or inches. When data R is an incremental one, its value is calculated from the initial point. The mirror image and scaling data are applicable to the data of point R. They are modal data deleted by G80 or by the codes of the interpolation group. The control will always approach point R in a rapid traverse.
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