NCT Group NCT 100T, NCT 990T, NCT 2000T manual Block Restart

13.4Automatic Operation Restart with BLOCK RESTART Condition

5th case: Return to block start position after interrupting machining in offset mode at outside corner

By the use of BLOCK RE-

START condition it

is set out from the offset vector on the start position of the interrupted block, the length of which is mul- tiplied by the length of the new tool radius and divided by the old one:

Afterwards the machining

is continued on the tool path with the new offset value.

When returning to start position of the block the control also returns all axes.

6th case: Return to block start position after interrupting machining in offset mode at inside corner

When the BLOCK RE-

START condition is

on, machining inside a cor- ner corresponds to that of outside a corner. However

this time, as seen on the

diagram, if one of the

blocks is a circle, it cuts

into the workpiece. This

can be surmounted if the tool is not returned fully to

the start position, but is stopped earlier and

BLOCK RESTART

condition is switched off. From than on it corre-

sponds to the process dis-

cussed in the chapter “Unconditional Restart of Automatic Mode”. Another possibility is to start a block search for the interrupted block, however this is the province of another chapter.

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