Specialized Concentrated Focused
The hardware frequency of NK105G2/G3 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.
Stepping motor
Pulse equivalent
Screw pitch
360
Subdivision Mechanical deceleration ratio
Stepping angle
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:
Pulse Equivalent 5mm 0.0025mm / p
360 10 1
1.8
Servo motor
Electronic gear ratio B Encoder resolution Mechanical deceleration ratio
A
Screw pitch
Pulse equivalent
Electronic gear ratio: if a servo motor makes one circle per every 5000 pulse commands sent by
the system, setting electronic gear ratio of the servo motor can make the servo rotate twice with the
same amount of pulse commands (please refer to parameter setting of each servo brand).
Please see the servo motor label plate and then refer to the corresponding manual to confirm its
encoder resolution. A label plate of YASKAWA SGMSH type motor is as shown below, and the 4th
character in motor type is the serial encoder specification, so the resolution of this motor is 217, i.e.
131072.
「24」Machine Tool Debugging
    "