Rigid Tapping on Sinumerik 840D/810D with G331 G332



CNC Rigid Tapping

Most CNC machine tools now offer rigid tapping capability as a standard feature. During rigid tapping, the machine’s spindle rotation and feed are synchronized to match a specific thread pitch as the rigidly- mounted tap is quickly driven in and out of a hole.

Rigid Tapping

Rigid Tapping

Rigid Tapping on Sinumerik 840D/810D with G331/G332

On Sinumerik 840D / Sinumerik 810D rigid tapping is done with G331/G332 G-codes.

G331 Tapping
G332 Tapping with retraction. The spindle changes direction of rotation automatically.

With G331/G332
Positive lead (e.g. K4) is used for right-hand thread,
Negative lead (e.g. K-4) is used for left-hand thread.

Programming

N50 G331 Z-50 K2 S500
N60 G332 Z5 K2

 

Rigid Tapping on Sinumerik 840D 810D with G331 G332

Rigid Tapping on Sinumerik 840D 810D with G331 G332

G331 Tapping

X, Y, Z : Thread end point
I, J, K : Thread lead. Positive lead (e.g. K4) right-hand thread, negative lead (e.g. K-4) left-hand thread.

G332 Tapping with Retraction.

The spindle changes direction of rotation automatically
X, Y, Z  : Thread retraction end point.
I, J, K  : Thread lead. Positive lead (e.g. K4) right-hand thread, negative lead (e.g. K-4) left-hand thread.

For this function, the spindle must be equipped with a pulse generator.


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