YASKAWA SIEMENS CNC Series, Maintenance Manual, Serviceman Handbook

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14.4 High-speed High-accuracy Cutting
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14.4 High-speed High-accuracy Cutting
YS 840DI system High-speed High-accuracy Cutting function does not have any special high-
speed modes, such as conventional U-HSC function or G-HSC function, which are different
from general cutting modes. This High-speed High-accuracy Cutting function enables the con-
ventional cutting to provide machining as accurate as G-HSC function which employs the
multi-block look-ahead.
In addition, by adding the following functions to the conventional cutting feed, higher-speed,
higher-accuracy cutting is provided for micro-block program machining such as die machining.
• Block compression: Two or more blocks having accuracy less than setting tolerance are
compressed into a single linear or spline block. This allows high-speed processing for
micro-length block for die machining.
• Spline interpolation: Using some spline interpolation algorithms, linear blocks are con-
verted into spline curves so that smooth machining face can be permitted.
There is no particular conditions for maneuverability, especially for G code, since con-
ventional cutting feed function is used.
• Predictive control is always enabled with usual cutting feed.
• For details about the acc./dec. control setting, see Section 14.3.2.
14.4.1 Multi-block look-ahead
To permit the feed speed control suitable for machining pattern, multi-block look-ahead is
enabled.
Parameters for the multi-block look-ahead are shown as followings.
• MD18360 EXT_PRG_BUFFER_SIZE
Meaning: Definition for memory required for external memory operation
Setting value: 100Kbyte
• MD28060 IPO_BUFFER_SIZE
Meaning: IPO buffer size
(Definition for the number of blocks inside interpolation buffer)
Setting value: 2 to 300 blocks
Standard setting value: 100 blocks
• MD28070 NUM_BLOCKS_IN_PREP
Meaning: Number of reserved blocks (Definition for the number of blocks
reserved)
Setting value: 2 minimum, maximum value depends on memory capacity
Standard setting value: 60 blocks
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