Drf Offset - Siemens SINUMERIK 840D sl Function Manual

Supplementary conditions
● Preconditions
● Limit values
● Interruption of traversing movement
● Channel-specific deletion distance-to-go
4.8

DRF offset

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
Extended Functions
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Fixed feedrate, dry-run feedrate, thread cutting, or tapping must not be selected.
The acceleration and velocity of the axes are limited to the values defined in the machine
data.
On NC Stop, the function remains selected but the handwheel pulses are not summated
and are ineffective.
Precondition: MD32084 $MA_HANDWH_CHAN_STOP_COND bit 2 = 1
DRF
A selected DRF function also has a path-override action.
This causes the movement triggered by the contour handwheel to be aborted; the axes
are decelerated and the program is restarted with the next NC block. The contour
handwheel then becomes effective again.
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).
Manual and Handwheel Travel (H1)
4.8 DRF offset
309