Reference / Synchronize - Siemens SINUMERIK 828D Function Manual

S1: Spindles

16.3 Reference / synchronize

16.3 Reference / synchronize
Why synchronize?
In order to ensure that the control detects the exact position of the spindle when it is switched on, the control
must be synchronized with the position measuring system of the spindle.
The following functions are possible only with a synchronized spindle:
• Thread cutting
• Rigid tapping
• Axis programming
References:
For further explanations about synchronization of the spindle, see Function Description "R1: Reference point
approach [Page 1199]".
Why reference?
In order to ensure that the control detects the exact machine zero when it is switched on, the control must be
synchronized with the position measurement system of the rotary axis. This process is known as referencing.
The sequence of operations required to home an axis is known as homing.
Only a homed axis can approach a programmed position accurately on the machine.
References:
For further explanations about referencing the rotary axis, see Function Description "R1: Reference point
approach [Page 1199]".
Installation position of the position measurement system
The position measurement systems can be installed as follows:
• Direct on the motor in combination with a Bero proximity switch on the spindle as a zero-mark encoder
• On the motor via a measuring gearbox in combination with a Bero proximity switch on the spindle as a zero-
mark encoder
• Directly on the spindle
• On the spindle via a measuring gearbox in combination with a Bero proximity switch on the spindle as a zero-
mark encoder (only with ratios not equal to 1:1)
Where two position measuring systems are provided, they can be installed either in the same location or
separately.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions