Siemens Sinumerik 840D Operating Turning page 44

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Programmable presettings

There is yet another means of influencing the continuous path behaviour

by changing-over to the next positioning block depending on the pro-

grammed path velocity of the tool.

Change-over when the command position„ is reached

The block change-over is initiated as soon as the control has evaluated the

command speed for all axes to be equal to zero.

Since the physical tool position lags behind the calculated value by a cer-

tain amount, the effect in this case is that the axis changes direction before

the end of the interpolation is reached.

The greater the feed rate, the greater is also the lag of the tool behind the

evaluated value and therefore the rounding radius.

This permits the contour corners to be formed in dependence on the path

The rounding radius depends on the programmed path velocity as well as

the drive mechanics of the machine.

The codes G601, G602 and G603 are modal.

They can be activated only in conjunction with "Exact Stop" and with

G09 or G60 respectively.

Destination point of the pro-

grammed path (interpolation end)

Actual tool path with smaller feed

Actual tool path with greater feed

840D/828D SINUMERIK Operate

Sinumerik 828d