Specialized Concentrated Focused
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34
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Machining Operations
* A x is O u tp u t D ir
X A x is:
N eg ativ e
Y A x is:
P o sitiv e
Z A x is:
P o sitiv e
Fig. 4-3 Modification interface of “Axis OutputDir”
CAUTION
Parameters with sign “*” in front take effect after restart the software, while parameters without the sign take
effect immediately after modification.
4.3. Pulse Equivalent Adjustment
Pulse equivalent is the moving distance of the worktable or rotation degree of the rotary axis per pulse
sent by the CNC device, i.e. the minimum distance controlled by the CNC system. This item can be
calculated in terms of information of screw pitch, electronic gear ratio, mechanical deceleration ratio, etc.
The smaller the pulse equivalent is the higher the machining precision and surface quality will be. At the
meanwhile, the setting value of pulse equivalent decides the max. feed speed (feed rate), and the
relationship between pulse equivalent and max. feed speed is as shown below:
(s/min)
60
(p/s)
frequency
Hardware
(mm/p)
equivalent
Pulse
(mm/min)
speed
feed
Max.
The hardware frequency of NK105G2F/G3F is 320KHz; when pulse equivalent is 0.001mm/p, the max.
feed speed of machine tool is 19.2m/min.
Lower pulse equivalent should be set under the condition of meeting the demand of feed speed.
Pulse Equivalent of Linear Axis
The calculation of pulse equivalent varies with different motor systems.
1) Stepping motor
ratio
on
decelerati
Mechanical
n
Subdivisio
angle
Stepping
360
pitch
Screw
equivalent
Pulse
Hereinto, mechanical deceleration ratio= rotary speed input in reducer / rotary speed output =teeth
number of driven gear / teeth number of driving gear.
For instance, the selected screw lead of X-axis for a certain type machine tool is 5mm, and the stepping
angle of stepping motor is 1.8°, with
―10‖ subdivision and ―1:1‖ deceleration ratio. Thus, the pulse
equivalent of X-axis is:
0.0025mm/p
1
10
1.8
360
5mm
Equivalent
Pulse
