H1: Manual Travel And Handwheel Travel; Brief Description; Overview - Siemens SINUMERIK 840D sl Function Manual

H1: Manual travel and handwheel travel

4.1

Brief description

4.1
4.1.1

Overview

Applications
Even on modern, numerically controlled machine tools, a facility must be provided that
allows the user to traverse the axes manually.
Setting up the machine
This is especially necessary when a new machining program is being set up and the
machine axes have to be moved with the traversing keys on the machine control panel or
with the electronic handwheel. Where coordinate offset or rotation is selected, manual travel
can even be performed in the transformed workpiece coordinate system.
Retraction of tool
After a program interruption caused, for example, by NC STOP, RESET or a power failure,
the machine user must retract the tool manually from its current machining position. This is
usually done by operating the traversing keys in JOG mode. The transformations and
coordinate systems used for machining must remain active while this is done.
Variants of manual travel
The following variants of the manual travel are explained under function description:
● Continuous travel in jog or continuous mode in JOG
● Incremental travel (INC) in jog or continuous mode in JOG
● Travel of axes using electronic handwheels (accessory) in JOG
● Handwheel override in AUTOMATIC (path default and velocity override)
DRF
The differential resolver function (DRF) generates an additional incremental work offset in
AUTOMATIC mode via the electronic handwheel. This function can be used, for example, to
correct tool wear within a programmed block.
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
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