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Cycle 17 disk, 4 er osion cy cles – HEIDENHAIN TNC 406 User Manual

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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.

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