Siemens SINUMERIK User Manual page 184

● Selection of the cutter radius compensation according to the active tool point direction and traveling along the undercut
contour at the feedrate programmed prior to the cycle call
● Retraction to the starting point with G0 and deselection of the cutter radius compensation with G40
Explanation of the parameters
SPD and SPL (starting point)
Use the parameter SPD to specify the finished part diameter for the undercut. The SPL parameter defines the finished
dimension in the longitudinal axis.
If a final diameter of <3 mm results for the value programmed for SPD, the cycle is canceled, and alarm 61601 "Finished
part diameter too small" is issued.
FORM (definition)
Form E and form F are fixed in DIN509 and must be defined using this parameter.
If the parameter has a value other than E or F, the cycle aborts and creates alarm 61609 "Form defined incorrectly".
See the following illustration for Form E and Form F:
VARI (undercut position)
The position of the undercut can be either specified directly or derived from the tool point direction with the _VARI
parameter.
Programming and Operating Manual (Turning)
184
01/2017