Siemens 810T manual Scratching

3 Operating Sequences 09.91

3.2.13 Scratching

3.2.13 Scratching

If there is a breakdown during the program process, e. g. a tool breakage, you must leave the contour by changing to the ºJOGº or ºINC 1 ... INC 10 000º operating mode, in order to change the tool.

After entry of the new tool length compensation (the cutter radius remains unchanged) you traverse the tool to return to any point on the contour - within the interrupted block - (ºScratchingº).

Sequence of operation

+X +Q

± Z +Z

± Q± X

AUTO-

MATIC

and

or

Prerequisite :

A tool change has been carried out;

The control is in ºJOGº mode:

Using the direction keys, now traverse to any point that lies within the interrupted block.

Using the operating mode selection key (integrated

machine control panel) and softkey ...

or

... with this symbol on the operating mode selector switch (external machine control panel) select ºAUTOMATICº mode.

Resume the program process with ºProgram startº.

In a block with circular interpolation (G02, G03) the scratching must take place in a very narrow range.

This range is defined in machine data.

Standard definition via MD º9º. If the range is exceeded: alarm

3018: ªDistance from contour too great (NC MD9)º.

3-134 © Siemens AG 1990 All Rights Reserved 6ZB5 410-0EP02

SINUMERIK 810T, GA3 (BN)