2. FUNCTION TO SIMPLIFY
(For the Power Mate i–D/D2)
The chaser tool is used to cut an external thread while the tap is used to
cut an internal thread. A chaser tool is shaped like die blades separated
from each other. Usually, a chaser tool is fastened to the die head, and
opens and returns by rapid traverse after threading.
M29 S_ ;
G78 : Clockwise threading cycle
G79 : Counterclockwise threading cycle
x : Threading end point
r : Point R position
q : Specify the chaser open control position by the distance from X.
f : Cutting feedrate (mm/min or inch/min)
(a) (b) (c)
1) The specification of M29S_; sets the rigid mode.
2) Movement to point R is made by rapid traverse.
3) A check is made to ensure that the chaser tool is closed.
4) Threading up to point X. At the position away backward from X
by a distance of Q, the chaser open signal CTOPN<F209#7> is
5) When point X is reached, a check is made with the chaser tool
open/close state check signal CTCHK<G212#4> to ensure that the
chaser tool is open.
6) The chaser tool returns to the initial point by rapid traverse.
7) The chaser tool open signal CTOPN is turned off to close the chaser
8) With G80, the rigid mode and the canned cycle mode are cancelled.
Rigid Threading Cycle
Supporting a Chaser
Tool (G78, G79)