5
08/2005 ShopTurn Functions
5.3 Turnin
5
♥ Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl Operation/Programming ShopTurn (BAT) – 08/2005 Edition 5-197
5.3.2 Recessing cycles
Recessing cycles are used when you want to machine symmetrical
and asymmetrical grooves on any straight contour element.
Z
X
Inclined recess
You can machine outside and inside recesses in the longitudinal or
transverse directions.
Use the Recess width and Recess depth parameters to determine the
shape of the recess. If a recess is wider than the active tool, it is
machined in several cuts. The tool is moved by (a maximum of) 80%
of the tool width for each recess.
You can specify a final machining allowance for the recess base and
the flanks; the part is then roughed down to this allowance.
The hold time between recessing and retraction is stored in a machine
data code.
Please also refer to the machine manufacturer's instructions.
Approach/retraction
Roughing (infeed depth D > 0)
D
D
Safety clearance
(1)
(3)
(2)
(5)
(4)
(7) (6) (8)
D
D + safety clearance
D + safety clearance
Machining steps in recessing
1. The tool is moved at rapid traverse first to the return plane and
then to the safety clearance.
2. The tool cuts a recess in the center of infeed depth D (1).
3. The tool moves back by D + safety clearance at rapid traverse.
4. The tool cuts a recess next to the first recess of infeed depth 2D
(2).
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