Programming and Operating Manual (Turning)
166 01/2017
Explanation of the parameters
For an explanation of the parameters RTP, RFP, SDIS, DP, and DPR, see Section "Drilling, centering - CYCLE81
(Page 152)".
The dwell time must be programmed in seconds. It is only effective in tapping without encoder.
SDR (direction of rotation for retraction)
SDR=0 must be set if the spindle direction is to reverse automatically.
If the machine data is defined such that no encoder is set (in this case, machine data MD30200 $MA_NUM_ENCS is 0), the
parameter must be assigned the value 3 or 4 for the direction of rotation; otherwise, alarm 61202 "No spindle direction
programmed" is output and the cycle is aborted.
SDAC (direction of rotation)
Because the cycle can also be called modally (see Section "Graphical cycle programming in the program editor
(Page 148)"), it requires a direction of rotation for tapping further threaded holes. This is programmed in parameter SDAC
and corresponds to the direction of rotation programmed before the first call in the higher-level program. If SDR=0, the value
assigned to SDAC has no meaning in the cycle and can be omitted in the parameterization.
If tapping is to be performed without encoder although an encoder exists, parameter ENC must be assigned value 1.
If, however, no encoder is installed and the parameter is assigned the value 0, it is ignored in the cycle.
MPIT and PIT (thread lead as a thread size and as a value)
The parameter for the lead is only relevant if tapping is performed with encoder. The cycle calculates the feedrate from the
spindle speed and the lead.
The value for the thread lead can be defined either as the thread size (for metric threads between M3 and M48 only) or as a
value (distance from one thread turn to the next as a numerical value). The parameter not required in each case is omitted in
the call or is assigned the value zero.
If the two lead parameters have conflicting values, alarm 61001 "Thread lead wrong" is generated by the cycle and cycle
execution is interrupted.
Note
Depending on the settings in machine data MD30200
$MA_NUM_ENCS, the cycle selects whether tapping is to be
performed with or without encoder.
The direction of rotation for the s
pindle must be programmed with M3 or M4.
In thread blocks with G63, the values of the feedrate override switch and spindle speed override switch are frozen to 100%.
A longer compensating chuck is usually required for tapping without encoder.
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