Tool Change Point; Supplementary Conditions; Examples - Siemens SINUMERIK 840D sl Function Manual

References
For further information about M functions which also apply to tool change M06 (e.g. extended
address, time of output to PLC, auxiliary function groups, behavior during block search,
behavior during overstore) see:
Function Manual, Synchronized Actions
17.6

Tool change point

Tool change point
The selection of the tool change point has a significant effect on the cut-to-cut time
(Page 838). The tool change point is chosen according to the machine tool concept and, in
certain cases, according to the current machining task.
Approaching a fixed point
Fixed positions on a machine axis stored in machine data can be approached by means of the
"fixed-point approach" function. This can be used to define and control one or several tool
change points.
There are two fixed point approach options:
● Approaching a fixed point in JOG
The machine user starts the "fixed-point approach" in the JOG mode with the traverse keys
or the handwheel (see Section "Approaching a fixed point in JOG (Page 185)").
● Approaching a fixed point with G75
Fixed point approach is called using the command G75 from the part program.
References:
Programming Manual, Fundamentals, Section: Additional commands > Approach fixed
point (G75)
17.7

Supplementary Conditions

The tool change requires, amongst other things, a tool management system which ensures
that the tool to be loaded is available at the tool change position at the right time.
17.8

Examples

Milling machine
The following example shows a typical cut-to-cut sequence of operations for a tool change
with a tool changer and a fixed absolute tool change point on a milling machine.
Extended Functions
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
W3: Tool change
17.8 Examples
839