Siemens SINUMERIK 840D Function Manual page 688

H1: Manual traversing
17.11 Circular travel in JOG
Allowance for tool radius
If bit 1 is set in the setting data SD42692 $SC_JOG_CIRCLE_MODE, then the tool radius is
considered when monitoring the operating range limits (define circular arc; for circle segment
machining also the limits that arise due to the start and end angle):
Figure 17-7
Note
By taking the tool radius into consideration, the smallest possible radius for the internal
machining in the vicinity of the center point of the circle is also limited.
Axis monitoring
If the current axis positions of the engaged axes are outside of the workspace limits when the
function is activated, then the axes are not traversed and an alarm is output.
Axis positions that are outside of the operating range limits are:
● For internal machining: positions outside of the defined circle
● For external machining: positions within the define circle
● For circle segment machining: Positions outside of the limits that result from the start and
end angles (segment borders)
● For active tool radius compensation: Positions too close to limiting circle
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Circular travel in JOG: Circle segment internal machining with tool radius compensation
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Axes and spindles
Function Manual, 06/2019, A5E47437747B AA