HEIDENHAIN TNC 406 - Manual (Page 164)

HEIDENHAIN TNC 406, TNC 416 143
8.4 Er
osion Cy
cles
Differences with sparking out
„ Fast sparking-out (MOD = 0 to 3)
The TNC ends the cycle when the electrode reaches the final vector
V and has eroded one full orbit at the final depth.
„ Complete sparking-out (MOD = 4 to 7)
The TNC ends the cycle when the electrode reaches the final vector
V and has eroded 1.25 orbits at the final depth.
Types of electrode movement
„ Circular expansion (MOD = 0 and 4)
From the starting depth S the electrode moves along the surface of
a circular cone until it reaches the programmed eroding depth T and
the expansion radius RAD (see top illustration).
„ Square expansion (MOD = 1 and 5)
From the starting depth S the electrode moves along the surface of
a square-base pyramid until it reaches the programmed eroding
depth T and the expansion radius RAD (see center illustration).
„ Orbital sinking (MOD = 2 and 6)
The electrode moves from the starting point S by the expansion
radius RAD in radial direction. It then follows a radial path until
reaching the eroding depth. After reaching the eroding depth T, the
TNC moves the electrode to the starting point S on a diagonal path.
„
Orbital sinking (MOD = 3 and 7)
The electrode moves from the starting point S by the expansion
radius RAD in radial direction. It then follows a radial path until
reaching the eroding depth (see bottom illustration). After reaching
the eroding depth T, the TNC moves the electrode to the starting
point S on a diagonal path.
Overview of expansion modes
Feed rates for eroding with Cycle 17 DISK
The feed rate for rotary motion is the same as the last-programmed
feed rate. It is limited by user parameters MP1092 to MP1097.
The feed rate in the tool axis direction is determined by the gap
control.
Movement Sparking-out Mode
Circular expansion Fast
Complete 0
4
Quadratic
expansion Fast
Complete 1
5
Orbital sinking Fast, with diagonal retraction
Complete, with vertical
retraction 2
6
Orbital sinking Fast, with diagonal retraction
Complete, with vertical
retraction 3
7
S
RAD
T
S
RAD
T
S
RAD
T