Siemens SINUMERIK 840D sl Function Manual page 998

Tool Change (W3)
Tool change point
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 996). The tool change point is chosen according to the machine tool concept and, in
certain cases, according to the current machining task.
Fixed point approach
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.
Fixed point approach is possible in two ways:
● Fixed point approach in JOG
● Fixed point approach with 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.
998
The machine user starts the fixed point approach in the JOG mode with the traverse keys
or the handwheel.
References:
Function Manual of Extension Functions; Handwheel and handwheel frame (H1),
Chapter: "Fixed point approach in JOG"
Fixed point approach is called from the part program via the command G75.
References:
Programming Manual Fundamentals, Chapter: "Travel commands" > "Approaching fixed
point (G75)"
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions