Siemens SINUMERIK 840D sl Function Manual page 1327

Syntax
The syntax for the programming of a convex thread therefore has the following general form:
G335/G336 <axis target point coordinate(s)> <pitch> <arc> [<starting
point offset>]
Permissible arc areas
The arc programmed at G335/G336 must be in an area in which the specified thread main axis
(I, J or K) has the main axis share on the arc over the entire arc:
Permissible areas for the Z axis (pitch programmed
with K)
A change of the thread main axis as shown in the following figure is not permitted:
Figure 17-3
Boundary conditions
Frames
G335 and G336 are also possible with active frames. However, you must ensure that the
permissible arc areas are maintained in the basic coordinate system (BCS).
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Convex thread: Area that is not permissible
Permissible areas for the X axis (pitch programmed
with I)
V1: Feedrates
17.2 Path feedrate F
1327