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10-2-3. Outline of Copy Turning Cycle
Rough turning cycle in the longitudinal direction (example A)
(1) The commands in block N0121 position the axes at the tool change position.
(2) With the commands in block N0122, S, T, and M commands for the rough turning cycle are
selected, then the axes are positioned at the AP starting point.
When no S, T, or M command is specified in this block, those selected in the preceding block(s)
are effective.
(3) The NAT20 command in block N0103 causes the control to search for the program assigned
the program name NAT20. A rough turning cycle in the copy turning mode is performed with
this program.
The cutting conditions for the rough turning cycle are also specified in the same block.
D
: Depth of cut
U
: X component of stock removal in finish turning cycle
W
: Z component of stock removal in finish turning cycle
Also program an F word if required. When no F word is designated in the contour definition
program, the feedrate commanded last becomes effective.
(4) Upon reaching the commands in block N0201 in the contour definition program, the control
calculates the intersection point of two straight lines: the line parallel to the Z-axis running at
"Xs-D/2" and the one passing through the two points (Xs, Zs) and (Xa + U, Za + W). Then the
axes are positioned at the calculated point A (Xp, Zp).
Along with the positioning, the control calculates the distance (XOFF, ZOFF) between these two
points (Xp, Zp) and (Xa + U, Za + W).
Xp = Xs - D
Zp = Za + W + (Zs - Za - W) (1 - D / (Xs - Xa - U))
XOFF = Xp - (Xa + U)
ZOFF = Zp - (Za + W)
If the value of U or W is too large and the infeed direction is reversed, an alarm occurs.
(Za, Xa)
SECTION 8 LATHE AUTO-PROGRAMMING FUNCTION (LAP)
(Zs, Xs)
D/2
(Zp, Xp)
XOFF/2
ZOFF
U/2
W
5238-E P-193
LE33013R0301000180001
LE33013R0301000180002
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