Drf Offset - Siemens SINUMERIK 840D sl Function Manual

4.7

DRF offset

4.7
Function
The "DRF offset" function (differential resolver function) can be used to set an additive
incremental work 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 machine axes to which the geometry or auxiliary axis is mapped.
The DRF offset is not displayed in the axis actual-value display.
References:
/BAD/ HMI Advanced User Manual
/BEM/ HMI Embedded User Manual
Applications
The DRF offset can be used, for example, in the following application cases:
● Offsetting tool wear within an NC block
● Highly precise offset during grinding
● Simple temperature compensation
Velocity reduction
The velocity generated by the handwheel for DRF can be reduced as compared to the JOG
velocity via axial machine data
MD32090 $MA_HANDWH_VELO_OVERLAY_FACTOR
(ratio of JOG velocity to handwheel velocity).
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
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).
CAUTION
The work 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.
H1: Manual travel and handwheel travel
4.7 DRF offset
315