Commissioning - Siemens SINUMERIK 840D Function Manual

H1: Manual traversing
17.13 Use of handwheels in automatic mode
17.13.3.2

Commissioning

Function
The "DRF offset" function (differential resolver function) can be used to set an additive
incremental zero offset in respect of geometry and auxiliary axes in the basic coordinate system
in AUTOMATIC mode via an electronic handwheel.
The handwheel assignment, i.e. the assignment of the handwheel from which the increments
for the DRF offset are to be derived, to the geometry or auxiliary axes that are to be moved by
this, must be performed via the appropriate machine axes. The appropriate machine axes are
those to which the geometry or auxiliary axis is mapped.
The DRF offset is not displayed in the axis actual-value display.
Applications
The DRF offset can be used, for example, in the following application cases:
● Offsetting tool wear within an NC block
Where NC blocks have very long processing times, it becomes necessary to offset tool wear
manually within the NC block (e.g. large surface-milling machines).
● Highly precise offset during grinding
● Simple temperature compensation
Note
The zero offset introduced via the DRF offset is always effective in all modes and after a
RESET. It can, however, be suppressed non-modally in the part program.
Velocity reduction
The velocity generated using the handwheel for DRF can be reduced with respect to the JOG
velocity:
MD32090 $MA_HANDWH_VELO_OVERLAY_FACTOR (ratio of JOG velocity to handwheel
velocity (DRF))
DRF active
DRF must be active to allow the DRF offset to be modified by means of traversal with the
handwheel. The following requirements must be fulfilled:
● AUTOMATIC mode
● DB21, ... DBX0.3 (activate DRF) = 1
The DRF offset can be activated/deactivated for specific channels using the "program control"
function on the HMI user interface.
The HMI software then sets interface signal:
DB21, ... DBX24.3 (DRF selected) =1.
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA