Specialized Concentrated Focused
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22
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Operation
Parameter
Definition
Setting Range
motion directions of Y axis.
Z-axis output direction
It specifies the motion direction of Z axis.
“1”, “-1” represents the two
motion directions of Z axis.
Fix the positive direction of each axis following the right-hand rules, and then manually operate the
machine to check if the axis moves correctly. If the direction is opposite, please modify the
corresponding parameter. Take X-axis as an example, manually move X axis, but X axis moves
oppositely; at this time, users can just change the value of
parameter “N1017” to “-1”, if its value is
“1” currently.
3.3.2 Pulse Equivalent Adjustment
Pulse equivalent (p): the moving distance of workbench or rotation degree of rotary axis corresponding
to one pulse sent by CNC device, the minimum available distance controlled by CNC system as well.
The smaller the pulse equivalent is, the higher the machining precision and surface quality will be. The
larger, the faster feedrate will be. Therefore, lower pulse equivalent should be set under the condition of
meeting the demand of feedrate. The relationship between Max. feedrate and pulse equivalent is as
follows:
Max. Feedrate= Pulse Equivalent X 60 X Frequency
For example, the hardware frequency of NK200 is 320 KHz and provided the pulse equivalent is 0.001
mm/p, then:
Max. Feedrate=0.001 X 60 X 320000= 19.2m/min
Mechanical deceleration (m/n): the ratio of reducer input speed to output speed, equal to the ratio of the
teeth number of driven wheel to that of driving wheel. When applied in CNC machines, it specifies the
ratio of motor speed to screw speed.
Re ducer Input Speed
Teeth No. of Driven Wheel
Motor Rotational Speed
Mechanical Deceleration Ratio
Re ducer Output Speed
Teeth No. of Driving Wheel
Screw Roational Speed
Pitch (d): The axial distance between the corresponding points of two adjacent teeth on the threads.
The calculation of pulse equivalent varies with different motor systems.
Stepping Motor
In general, firstly set the subdivision and then calculate the pulse equivalent. You can set the pulse
equivalent before calculating subdivision. Their relationship can be shown as:
d
360
m
x
p
n
Hereinto, p stands for pulse equivalent, x for subdivision of stepping motor while
θ
refers to stepping
angle. Therefore,
