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

Programming technology functions (cycles)
10.2 Rotate
10.2.4

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
Parameters, G code program (undercut, form E)
PL Machining plane
SC Safety clearance
F Feedrate
412
1. The part program or ShopTurn program to be processed has been cre‐
ated 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:
Press the "Undercut form E" softkey.
The "Undercut form E (DIN 509)" input window opens.
- OR
Press the "Undercut form F" softkey.
The "Undercut form F (DIN 509)" input window opens.
mm
*
Parameters, ShopTurn program (undercut, form E)
T Tool name
D Cutting edge number
F Feedrate
S / V Spindle speed or constant cutting
rate
Operating Manual, 06/2019, A5E44903486B AB
mm/rev
rpm
m/min
Turning