HEIDENHAIN TNC 406 - Manual (Page 163)

142 8 Programming: Cycles
8.4 Er
osion Cy
cles
Cycle 17 DISK
The DISK cycle is a machining cycle. It facilitates the sparking-out
behavior and movement of the electrode.
You can use the DISK cycle to develop machining sequences such as
for conical cavities (see Chapter 7).
In Cycle 17 DISK you enter the
„
Eroding axis
„
Eroding depth
„ Miscellaneous function M
„ Expansion radius RAD
„ Expansion mode MOD
If necessary, you may also use Q parameters for the cycle definition.
Eroding axis and depth
The eroding axis determines the coordinate axis parallel to which
eroding takes place in the ”depth.”
The sign of the eroding depth determines whether the working
direction is the direction of the positive coordinate axis (depth +) or of
the negative coordinate axis (depth –).
You can enter the eroding depth in absolute or incremental
dimensions.
Miscellaneous function M
You can enter a miscellaneous function in Cycle 17 DISK, such as M36
(eroding ON).
Expansion radius RAD
The TNC feeds the electrode in radial direction (perpendicular to the
eroding depth) by the value of the expansion radius.
Calculating the expansion radius RAD
If the diameter D of the disk is known, you can calculate the expansion
radius RAD from the following data:
„ Diameter D of the disk
„ Electrode undersize UM
„ Electrode minimum undersize UNS
„
Electrode radius Re
RAD = 0.5 • (UM – UNS) = 0.5 • D – Re – 0.5 • UNS
Expansion mode MOD
The expansion mode MOD determines the movement of the
electrode while eroding. MOD also influences sparking out and the
retraction movement.
X
Z
RAD
UM
2
D
Re
UNS
2
V
The electrode radius Re must be larger than the expansion
radius RAD. Otherwise the pocket (disk) will not be
completely eroded.