Yaskawa YASNAC PC NC Programming Manual - Manual (Page 173)

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YASNAC PCNC Programming Manual Chapter 4: Enhanced Level Commands
(4) Supplements to the Hole Machining Pattern Cycle Function
• To execute a hole machining cycle using G70, G71, or G72, a canned cycle (G73,
G74, G76, G77, G81 - G89) should be specified with “L = 0” in the preceding block as
shown in the Example of Programming of Fig. 4.15. By the designation of “L = 0”,
the hole machining position data are saved without executing the canned cycle.
• It is allowed to specify a G code calling a canned cycle with G70, G7 1, or G72 in the
same block. However, the canned cycle (G73 and G83) which uses addresses I, J, and
K cannot be specified with G70, G71, or G72 in the same block. To use G73, G83, or
2-step hole machining canned cycles (G181, G182, G185, G186, G187, G189), either
use address Q or specify I, J, or K in the preceding block.
• The hole machining canned cycle executed using G70, G71, or G72 ends after the
retraction from the hole machined last. To execute positioning to the next position,
move distance must be calculated if the cycle is programmed in the G91 (incremental)
mode. Since the use of the G90 (absolute) mode does not require such calculation, it
can be used more conveniently than the G91 mode.
• “Upon completion of G70, G71, or G72, the canned cycle mode remains valid. It is
necessary to execute G80 to cancel the canned cycle mode.
• If G70, G71, or G72 is specified in the tool radius offset mode (G41, G42), alarm
“0182” occurs.
4.1.3 Solid Tap Function (G84, G74) *
The solid tap function executes tapping by synchronizing Z-axis feed with spindle rotation. If
tapping is executed by using this function, a floating chuck is not necessary any more and, at the
same time, accurate tapping is made possible at a high speed. Conventional tapping operation can
also be programmed.
(1) Requirements for Adding the Solid Tap Function
To add the solid tap function, the following conditions are required.
• To install the S5-digit analog output option.
• To use Yaskawa’s VS-626VM3 or VS-626M5 for the spindle driver.
• To fix the gear ratio, to be used for solid tapping, by installing a PG to the spindle or
the spindle drive motor. The best performance can be expected if the spindle is
directly coupled to the spindle drive motor.
(2) Commands Used for Solid Tap Cycle
To execute solid tapping, change the mode to the solid tap mode and then specify the solid tap
cycle.
(a) Solid tap mode commands
The following G codes are provided to determine which of the tapping mode is called up,
solid tap or conventional tapping cycle. These G codes are modal. When the power is