Chapter
Ⅱ
G Commands
121
Ⅰ
Programming
lead.
Thread lead formula in per minute mode =cutting feedrate F/spindle speed S;
Thread lead formula in per rotation mode=cutting feedrate F.
Note: The spindle speed S is defined to be S modal value memorized by the CNC before the common
tapping,
The thread lead is counted by the specified F value. The spindle override is affected by
N0.3708#6 in common tapping.
In G84/G88 rigid tapping cycle, Q command and PCP determine three kind of rigid tapping
mode: standard rigid tapping cycle, high speed deep hole rigid tapping cycle and deep hole rigid
tapping cycle. There is only one mode in G84/G88 common tapping cycle, which is shown below.
The spindle rotating(the operator confirms the CW/CCW according to the used screw tap) is
specified before G84/G88 is commanded, and the CNC confirms the M command of spindle CCW
according to the previous spindle rotation direction of G84/G88; when the direction is not specified,
the spindle rotation (M03 CW) is defaulted in G84/G88 common tapping cycle.
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
M command outputs to make the spindle rotate (for example, M command does not output
when the spindle rotation is commanded before tapping cycle) ;
Fig.2-77
Common tapping cycle
Spindle rotation
(reverse)
Spindle stop
Operatoin 4
Pause at hole
Hole bottom level
P
Operation 5
retraction
Operatoin 3
Tapping feed
Imaginary
workpiece
Operation 2
Operation 6
Spindle
rotation
Initial level
Hole position
Starting
point
Operation 1
Spindle stop
Tool
(
variable screw tap
)
P
Pause
Z
(
X
)
feed
Rapid traverse
Spindle stop
Point R
Point R level
Содержание 988T
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