Form (Definition) - Siemens SINUMERIK 840D Programming Manual

03.96
4

FORM (definition)

Form E and Form F are defined in DIN509 and
determined by this parameter.
If the parameter is assigned a value other than E or
F, the cycle is aborted and alarm
61609 "Form incorrectly defined" is output.
The cycle automatically determines the tool point
direction from the active tool offset. The cycle can be
executed with tool point directions 1 ... 4.
If the cycle recognizes a tool point direction 5 ... 9,
alarm 61608 "Wrong tool point direction
programmed" is output and the cycle is aborted.
The cycle determines the starting point
automatically. This lies 2 mm from the final diameter
and 10 mm from the final dimension in the
longitudinal axis. The position of this starting point in
relation to the programmed coordinate values is
determined by the tool point direction of the active
tool.
The cycle monitors the clearance angle of the active
tool if a value has been assigned to the relevant
parameter of the tool offset. If the cycle ascertains
that the undercut form cannot be machined with the
selected tool because the clearance angle is too
small, the message "Changed undercut form" is
output by the control but machining is continued.
 Siemens AG 2000 All rights reserved.
SINUMERIK 840D/840Di/810D/FM-NC Programming Guide, Cycles (PGZ) - 04.00 Edition
4.4 Undercut cycle – CYCLE94
+X
For workpieces with
one machined surface
For workpieces with two
machined surfaces at
right angles to each other
SL 4
SL 1
Turning Cycles
4
FORM E
SL3
+Z
FORM F
SL2
+X
SL 3
+Z
SL 2
4-225