Siemens Sinumerik 840D Operating Turning page 104

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Tool nose radius correction

Tool nose radius correction OFF:

The tool point "P" is traversed along the programmed contour. (Switching

ON status of the machine)

Contour errors will result if the tool traverses in both axes simultaneously.

(e.g. in the case of cones and circular arcs).

During roughing these errors are ignored as they are negligible compared

to the stock/material clearance. Therefore during roughing the tool nose

radius correction is normally not activated, however this plays an important

role during finishing operation of the workpiece.

Tool nose radius correction to the left of the contour: Code G41

Internally in the control unit an equidistant path is calculated, along which

the cutting edge centre point is being guided, which lies to the left of the

contour when looking in the direction of feed.

Tool nose radius correction to the right of the contour: Code G42

The cutting edge centre point is being guided along an equidistant path

that lies to the right of the contour in the direction of feed.

The activation and deactivation of the tool nose radius compensation is

always accompanied with motion of the X or Z axis either in feed motion

(G1) or in rapid traverse (G00). The distance of this motion must at least

be equal to the cutting edge radius of the tool "R".

Programming example:

N40 G42 G00 X0 Z2

Left and right of the contour is

determined when looking at the

tool in the direction of feed.

Explanation:

G42 is activated with rapid traverse

Approach of the contour contour,

further contour machining, G01 remains

activated in modal manner

840D/828D SINUMERIK Operate

Sinumerik 828d