Undercut Form E And F (Cycle940) - Siemens SINUMERIK 840D sl Operating Manual

Programming technological functions (cycles)
10.4 Turning - milling/turning machine
Parameter
D
UX or U
UZ
N
DP
* Unit of feedrate as programmed before the cycle call
10.4.4

Undercut form E and F (CYCLE940)

Function
You can use the "Undercut form E" or "Undercut form F" cycle to turn form E or F undercuts
in accordance with DIN 509.
Approach/retraction
1. The tool first moves to the starting point calculated internally in the cycle at rapid traverse.
2. The undercut is made in one cut at the machining feedrate, starting from the flank through
to the cross-feed VX.
3. The tool moves back to the starting point at rapid traverse.
Procedure
470
Description
● Maximum depth infeed for insertion – (only for ∇ and ∇ + ∇∇∇)
● For zero: Insertion in a cut – (only for ∇ and ∇ + ∇∇∇)
D = 0: 1. cut is made directly to final depth T1
D > 0: 1st and 2nd cuts are made alternately to infeed depth D, in order to achieve
a better chip flow and prevent the tool from breaking, see approaching/retraction
when roughing.
Alternate cutting is not possible if the tool can only reach the groove base at one
position.
Finishing allowance in X or finishing allowance in X and Z – (only for ∇ and ∇ +
∇∇∇)
Finishing allowance in Z – (for UX, only for ∇ and ∇ + ∇∇∇)
Number of grooves (N = 1....65535)
Distance between grooves (inc)
DP is not displayed when N = 1
1. The part program or ShopMill program to be processed has been created
and you are in the editor.
2. Press the "Turning" softkey.
3. Press the "Undercut" softkey.
The "Undercut" input window opens.
4. Select one of the following undercut cycles via the softkeys:
Unit
mm
mm
mm
mm
Operating Manual, 05/2017, A5E40868956
Milling