Siemens SINUMERIK 840C - Manual (Page 748)

10 Axis and Spindle Installation 09.95
10.5.3 Positioning mode, M19, M19 through several revolutions
b) Spindle running
The spindle is driven to the specified position as quickly as possible, without
changing the direction of rotation.
The nearest position at which the spindle can be stopped is calculated from the
actual position and the deceleration distance based on the momentary speed. The
spindle is driven to the specified position in the direction of travel. The sum of this
required distance and the deceleration distance then gives the distance to be
traversed, which is covered as quickly as possible.
If the actual speed is less than the creep speed, the spindle is accelerated up to
and no further than the creep speed.
If the actual speed is greater than the creep speed, the spindle decelerated until
the creep speed has been reached (MD 427*). Then the M19 position is
approached with interpolation until the spindle can be stopped at the specified
position utilizing maximum deceleration.
Speed characteristic for case 1b (actual speed < creep speed)
n
t
Creep speed for M19
Speed at beginning of positioning
Beginning of positioning
Speed characteristic for case 1b (actual speed creep speed)
n
t
Creep speed for M19
Speed at beginning of positioning
Beginning of positioning
Deceleration from MD 419*
Dwell from MD 478*
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SINUMERIK 840C (IA)