CNC Z32 - Programming Guide (LATHES)
6.6.2
Variable pitch threading (G34, G35)
The term “variable pitch threading” indicates a threading whose pitch is not constant, but varies continuously
according to a determined variation quantity.
The variable pitch threading is programmed through two different G functions:
G34 K.. I..
rising
pitch threading
G35 K.. I..
decreasing
pitch threading
All descriptions related to the fixed pitch threading (G33) remain valid also for the variable pitch threading (G34 and
G35).
K
= initial threading pitch (mm or inches) This parameter can be programmed in the same block of G34/G35, or in
preceding blocks.
Warning: if the K parameter is newly programmed in subsequent blocks, when G34/G35 is active, an
abrupt pitch variation is encountered.
I
= pitch increment expressed in mm/round or in/round. This parameter can only be programmed in the same line of
G34/G35. The parameter is always positive and assumed as absolute value if programmed as a negative
number.
In G34 mode, it expresses the increment in mm or inches imposed on pitch K at every round.
In G35 mode, it expresses the decrement in mm or inches imposed on pitch K at every round.
Warning: if the continuous decrement of K brings to a negative value, the alarm CN1F13 will be issued
(in real time).
Threading movements with a fixed or variable pitch may be executed in sequence: the threading pitch will
continuously vary or remain constant, or it will have a discontinuity, depending on the threading function and
parameters programmed.
6.6.3
92
Summary of Contents for CNC Z32 Florenz Series
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