NCT Group 2000M, 99M manual 28.65mm⋅ 180 ⋅ π = 0.5mm

4.7Cylindrical Interpolation (G7.1)

Application of tool radius compensation in case of cylindrical interpolation Commands G41, G42 can be used in the usual manner in the switched-on state of cylindrical interpolation. Though the following restrictions are in effect regarding its application:

–Switch-on of cylindrical interpolation (command G7.1 Qr) is only possible in state G40.

–Should G41 or G42 be switched on in cylindrical interpolation mode, G40 must be programmed before switching cylindrical interpolation off (command G7.1 Q0).

Programming restrictions in the course of cylindrical interpolation

The following commands are not available in the switched-on state of cylindrical interpolation:

–plane selection: G17, G18, G19,

–coordinate transformations: G52, G92,

–work coordinate system change: G54, ..., G59,

–positioning in machine coordinate system: G53,

–circular interpolation by giving circle center (I, J, K),

–drilling cycles.

Example

The diagram beside shows a path milled 3 mm deep on the mantle of an R=28.65- mm-radial cylinder. Rotating tool T606 is parallel to the axis X.. 1° movement on the cylinder mantle is:

1°

28.65mm⋅ 180° ⋅ π = 0.5mm

The axis order seen on the diagram corresponds to plane selection G19.

Fig. 4.7-2

%O7602(CYLINDRICAL INTERPOLATION)

...
N020	G0	X200	Z20	S500	M3 T606
N030	G19 Z-20 C0				(G19: select plane C–Z)
N040	G1	X51.3 F100
N050	G7.1 C28.65				(cylindrical interpolation on, rotary
					axis: C, cylinder radius: 28.65mm)
N060	G1	G42 Z-10		F250
N070	C30
N080	G2	Z-40 C90		R30
N090	G1	Z-60
N100	G3	Z-75 C120 R15
N110	G1	C180
N120	G3	Z-57.5 C240 R35
N130	G1	Z-27.5 C275

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