Siemens SINUMERIK 840D Programming Manual page 206

3 3
Milling Cycles 12.97
08.99
3.15 Pocket milling with islands – CYCLE73, CYCLE74, CYCLE75
Machine residual material
The cycle allows material to be removed with a smaller
milling tool. The traversing motions defined by the
residual material of the last milling operation and the
current tool radius are output in the generated program.
The residual material technology can be programmed
repeatedly with a succession of decreasing tool radii.
No check is made on completion of the cycle for any
further residual material in the pocket.
Edge/base finishing
Another function of the cycle is to finish the pocket base
or circumnavigate the pocket and individual islands in a
finish operation.
Rough drill
Depending on the milling tool used, it may be necessary
to drill before solid machining the workpiece. The cycle
automatically calculates the rough drilling positions as a
function of the solid machining operation to be
performed afterwards. The drilling cycle called modally
beforehand is executed at each of these positions.
Rough drilling can be executed in a number of
technological machining operations (e.g. 1. centering, 2.
drilling).
© Siemens AG, 2002. All rights reserved
3-206
SINUMERIK 840D/840Di/810D Programming Guide Cycles (PGZ) – 11.02 Edition