Siemens SINUMERIK 840Di Function Manual page 1728

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2.4 Tool: Tool radius compensation 2D (TRC)

• Modal G code for defining the approach and retraction contour

The tangent at the end point of the preceding block is used accordingly on retraction. If the

end point is not programmed explicitly on retraction, i.e., if it is to be determined implicitly,

G143 is not permitted on retraction, since there is a mutual dependency between the

approach side and the position of the end point. If G143 is programmed in this case, an

alarm is output. The same applies if, when G140 is active, an automatic switchover to G143

takes place as a result of an inactive tool radius compensation.

This G code is only relevant if the approach contour is a quadrant or semicircle. The

approach and retraction direction can be determined as follows:

Defining the approach and retraction direction using active tool radius compensation.

(G140 is the initial setting.)

With positive tool radius:

- G41 active → approach from left

- G42 active → approach from right

If no tool radius compensation is active (G40), the response is identical to G143. In

this case, an alarm is not output. If the radius of the active tool is 0, the approach and

retraction side is determined as if the tool radius were positive.

Approach contour from left, or retract to the left.

Approach contour from right, or retract to the right.

Automatic determination of the approach direction, i.e., the contour is approached

from the side where the start point is located, relative to the tangent at the start point

of the following block (P

Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0

Tool Compensation (W1)

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