On machines equipped with absolute encoders, Parameter 1860 acts as a "memory bank." It records the distance from the machine's zero point to the current absolute position. This allows the machine to "remember" exactly where it is, even after the power is turned off.
Unlike static offsets, Parameter 1860 works dynamically: during a rigid tapping cycle, as the spindle reverses direction between hole bottom and retract, the CNC continuously applies the parameter 1860 adjustment to maintain synchronization. This ensures each thread is cut at the exact same helix angle, preventing "step" marks or oversized threads.
: For this parameter to be active, Parameter 1815 #5 (APC) must be set to 1 (indicating an absolute pulse coder is in use).
To properly configure or troubleshoot axis homing, you often need to look at the "1800-series" group of parameters:
Always back up all CNC parameters before making changes. Use a memory card or RS-232 to save your current backup. This operation requires access level 3 (maintenance) or higher.
Changing servo parameters incorrectly can cause the machine to move unexpectedly, crash, or alarm out. Always back up parameters before making changes.
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