Stock Removal With 2 Synchronized Channels - Siemens SINUMERIK 828D Operating Manual

Multi-channel machining
10.2 Multi-channel support
10.2.13

Stock removal with 2 synchronized channels

With multi-channel lathes, you have the option of simultaneously machining with 2 channels
(4 axes).
The tools are located in front of and behind the center of rotation, and machine the same
workpiece. For sufficiently long cuts, these are simultaneously used at different depth
infeeds, with a specified offset.
The advantage is that you reduce your production time. Further, when machining, the cutting
forces are better distributed.
Technological function
2-channel machining is available for the "Parallel stock removal" technology.
Leading channel/following channel
Define the leading channel when programming workpieces that you wish to machine utilizing
multiple channels. As a consequence, you define the channel-specific machine and setting
data that are used to create the stock removal programs.
Turning always starts in the leading channel. The second channel, also known as the
following channel, starts with the second depth infeed as soon as the leading channel has
removed stock by a specified "stock removal distance" (offset). If cuts are obtained that are
shorter than this offset, then machining is only carried out in the leading channel.
Offset
If the offset is not equal to zero, then a dedicated stock removal program is generated for
each channel. Automatically generated WAIT commands are used to synchronize both
programs.
If the offset is equal to zero, then only one stock removal program is generated. This
program is started in the leading channel. Axis coupling is used to generate the motion of the
following channel.
For multi-channel lathes, the name of the generated stock removal program is extended by
identifier "_C" with a subsequent two-digit channel number.
Roughing
When roughing, typically there is an offset between the channels when machining (channel
offset DCH).
● When the parameter is positive, then the leading channel machining is executed before
the following channel by the channel offset.
● When the parameter is negative, then the machining sequence is interchanged. The
program generated for the leading channel is in this case, started in the following
channel.
● When the parameter is equal to zero, then the workpiece is machined without offset (refer
to the paragraph "Finishing balance cutting").
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Operating Manual, 01/2015, 6FC5398-8CP40-5BA2
Turning