GSK GSK980TDc, Руководство пользователя

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Chapter 3 G Commands
121
Ⅰ
Progra
mming
3.21.4 Z thread cutting G33
Command format ： G33 Z(W)__ F(I)__ L__ ；
Command function: Tool path is from starting point to end point and then from end point to
starting point. The tool traverses one pitch when the spindle rotates one rev, the pitch
is consistent with pitch of tool and there is spiral grooving in internal hole of
workpiece and the internal machining can be completed one time.
Command specification: G33 is modal command;
Z(W): When Z or W is not input and starting point and end point of Z axis are the same one, the
thread cutting must not be executed;
F: Thread pitch, and its range is referred to Table 1-2;
I: Teeth per inch thread 0.06
～
25400 teeth/inch; its range is referred to Table 1-2. It is single
thread when L is omitted.
Cycle process:
Z tool infeed (start spindle before G33 is executed); ①
②
M05 signal outputs after Z reaches the specified end point in programming;
③
Test spindle after completely stopping;
④ Spindle rotation (CCW) signal outputs(reverse to the original rotation direction);
Z executes the tool retracts to starting point
⑤
;
⑥
M05 signal outputs and the spindle stops;
⑦
Repeat the steps
① ～ ⑤
if multi threads are machined.
Example: Fig. 3-89, thread M10×1.5
Program
:
O0011;
G00 Z90 X0 M03;
Start spindle
G33 Z50 F1.5; Tap cycle
M03
Start spindle again
G00 X60 Z100; Machine continuously
M30
Note 1: Before tapping, define rotation direction of spindle according to tool rotating. The spindle stops
rotation after the tapping is completed and the spindle is started again when machining thread
continuously.
Note 2: G33 is for rigid tapping. The spindle decelerates to stop after its stop signal is valid, at the moment,
Z executes continuously infeeds along with the spindle rotating, and so the actual cutting bottom
hole is deeper than requirement and the length is defined by the spindle speed and its brake in
tapping.
Note 3: Z rapid traverse speed in tapping is defined by spindle speed and pitch is not relevant to cutting
feedrate override.
Note 4: In Single block to feed hold, the tapping cycle continuously executes not to stop until the tool
returns to starting point when the system displays “Pause”.
Fig. 3-89