HEIDENHAIN TNC 640 User Manual page 367

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Cycles: Turning | ADAPT ROTARY COORDINATE SYSTEM

(Cycle 800, DIN/ISO: G800)

Eccentric turning

Sometimes it is not possible to clamp a workpiece such that the

axis of rotation is aligned with the axis of the turning spindle. This

is the case for example with large or rotationally non-symmetrical

workpieces. The eccentric turning Q535 function in Cycle 800 still

enables you to perform turning operations.

During eccentric turning, more than one linear axis is coupled to

the turning spindle. The TNC compensates the eccentricity by

performing circular compensating movements with the coupled

linear axes.

This feature must be enabled and adapted by the

machine tool builder.

With high speeds and high eccentricity, high feed rates of the linear

axes are needed to execute the movements synchronously. The

contour will be damaged if these feed rates cannot be maintained.

The TNC therefore generates an error message if 80 % of a

maximum axis speed or acceleration is exceeded. If this occurs,

reduce the rotational speed.

Danger of collision!

The TNC performs compensating movements during coupling

and decoupling. Check for possible collisions.

Coupling and decoupling are possible only with the spindle

HEIDENHAIN | User's manual for cycle programming | 10/2017