
6.RETHREADING SUPPLEMENT B-63344EN/02
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Qs: Spindle angular displacement for providing timing to start
feeding the tool at point A and synchronize the tool feed
with the phase of the thread
Qs= 360(Lead-r)/Lead
Lead , r : Remainder of L/Lead
L : Distance between the taught thread position and point A
Qz : Angle indicating the difference between the spindle one-
rotation signal detection position and spindle orientation
stop position. Qz differs depending on the machine. Set Qz
for parameter No. 9844.
Cutting start point
Taught thread position
Point A
Tool
L
Clearance determined by the value set for
parameter No. 9831
Start point Z
Start point Z = Start point Z of the thread figure
Qe : Spindle angular displacement equivalent to the amount of
the position error of the servo axis (Z)
Qe = ∆Ez × 360 / Lead
∆Ez:Amount of the servo position error at the threading feedrate
Qp : Spindle angular displacement equivalent to the amount of
accumulation during acceleration
This value can be changed by setting a new value for the
"SHIFT" figure data input item when required.
Qp = Shift amount × 360 / Lead
Shift angle Q above is calculated with the user macro (O1041). If
the tool feed cannot be synchronized with the phase of the thread,
the machine tool builder can change the expression according to
the machine.