Siemens SINUMERIK 840D sl Function Manual page 1745

Smoothed actual values
If lowresolution encoders are being used, smoothed actual values can be applied for
constant coupled path and axis motions.
Machine data:
MD34990 ENC_ACTVAL_SMOOTH_TIME
can be used to change the time constant for more effectively smoothed actual values for:
• Thread cutting with feedrate for G33, G34, G35
• Revolutional feedrate for G95, G96, G97, FRAPON
• Display of actual positions and actual speed/velocity
The larger the time constant, the better the smoothing of the actual values and the longer the
overtravel.
2.1.5 Feedrate for G331/G332, rigid tapping
Application
G331 (tapping) and G332 (tapping retraction) can be used to tap a thread without a
compensating chuck (rigid tapping) if the spindle is technically capable of operating in
position control mode.
Speed S, feedrate F, thread lead
A revolutional feedrate [mm/revolution] is used for G331and G332. The revolutional feedrate
is defined by programming the thread lead increase [mm/revolution].
The speed of the axes for the thread length is calculated from the programmed spindle
speed S and the thread lead.
Feedrate F [mm/min] = speed S [rev/min] * thread lead [mm/rev]
Note
For further information about programming G63/G331/G332, please see:
References:
/PG/ Programming Guide, Fundamentals
/PAZ/ Programming Guide, Cycles
Inhibiting stop events for G331/G332
During tapping, a stop can be prevented if the block contains a path movement or a G4.
For this purpose, bit 0 must be set to 0 in machine data:
MD11550 $MN_STOP_MODE_MASK.
The stop, which was activated previously, is possible again after G331/G332 has been
executed.
Basic logic functions: Feeds (V1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Detailed description
2.1 Path feedrate F
29