GSK 988T, User Manual

Page: 131 / 416

Chapter
Ⅱ
G Commands
117
Ⅰ
Programming
Execution process:
①
The tool rapidly positions to the hole from
starting point (the hole is determined by
the hole position data at the initial level
） ;
②
Rapidly position to point R;
③
The spindle starts rotation;
④ The tapping axis feeds at the cutting speed
F with the cutting amount q specified by Q
the spindle stops after the feed ends;
⑤
The spindle rotates reversely, and the
spindle stops rotation after the tapping axis
executes the tool retraction to point R level;
⑥
The spindle starts rotation, the tappind axis
executes infeed at the previous machine
level D (), and the retraction amount d) of
deep tapping is specified by No.5213.
⑦ The cutting feed of tapping is q+d;
⑧ Repeat the above ⑤⑥⑦ till the tool
reaches the hole bottom level; the spindle
stops;
⑨ Pause is executed in the time specified by P;
⑩
The spindle rotates reversely, and the
tapping axis returns to point R level at the
specified speed
；
⑾ Rapidly return to the inItial level;
⑿
Deep hole rigid tapping cycle ends.
Fig. 2-75
Note 1: In the rigid tapping cycle, the speed of tool retraction and the one of the tool cutting to the
previous machining level are specified by feedrate F (for tapping axis, the feedrate is the specified F
in the command, which can distinguish F98/G99; for the spindle, the feedrate is the specified spindle
speed) and extraction override.
The extraction override is fixed to 100% when the parameter DOV(No. 5200#4, whether the tool
retraction is valid in the rigid tapping) is set to 0.
When DOV (No.5200#4) is set to 1, it is divided into the following conditions:
（
1
）
The extraction override is set by No.5211(it is the override value in rigid tapping) , among which
the parameter OVU(NO.5201#3) is used to set the setting unit of extraction override parameter in rigid
tapping when the parameter OV3 (NO.5201#4 confirms the extraction override by the address
specifying whether the spindle speed is valid). Namely, unit of No.5211 is 1% or 10%,
（
2
）
When OV3 is set to 1, J address specifies the spindle speed in tool retraction.
100
command) (S speed Spindle
command) (J ing when tapp speed Spindle
) override(% Tapping
× =
Besides, when the override value is out of the range 100% ～ 2000%, it becomes 100%. When the
extraction is executed, the spindle speed address “J” is valid before the fixed tapping cycle is
cancelled in rigid tapping mode.
Deep hole rigid tapping cycle
Spindle
rotation
Point R level
Tool
Operation sequence
P
Pause
Z （ X ） feed
Rapid traverse
Spindle stop
Initial level
Hole position
Starting
point
Point R
Hole bottom
level
Infeed, retract
to hole bottom
Pause at hole
bottom
P
Spindle stop
Spindle
rotation
(reverse)
d
q
q
Imaginary
workpiece
Spindle
rotation
Spindle stop
Spindle
rotation
(reverse)
q
d