HUST CNC H6D-B3 - MCM Parameters: Resolution and Traverse Speed

HUST CNC H6D-B3 MANUAL
36
1. Resolution – DEN Format：□□□□□□□ (Default = 100)
2. Resolution – NUM Format：□□□□□□□ (Default = 100)
3. Encoder Factor Format：□ (Default = 4)
Denominator (D) = pulses/rev for the encoder on motor.
Numerator (N) = pitch length (mm/rev) of the ball-screw.
Gear Ratio (GR) = Tooth No. on ball-screw / Tooth No. on motor.
Pulse Multiplication Factor (MF) = Encoder Factor
Ex1: X-axis as linear axis, pitch = 5 mm = 5000 m
Encoder = 2500 pulses
Encoder Factor = 4
GR = 5 (motor rotates 5 times while ball-screw rotates once)
Machine resolution = 5000/(2500 x 4)/5 = 5000/50000 = 1/10 = 0.1
m/pulse
Therefore, the setting value for Resolution – DEN and Resolution – NUM
can be one of the three combinations. They are all correct.
(1) D=10000, N=1000 (2) D=10, N=1 (3) D=100, N=10
Setting by engineer.※
4. Traverse Speed Format：□□□□□
Unit: mm/min (Default=10000)
Note : The format is only for integer.
The traverse speed limit can be calculated from the following equation:
Fmax = 0.95 * RPM * Pitch * GR
RPM : The max. rpm of servo motor
Pitch : The pitch of the ball-screw
GR : Gear ratio of ball-screw/motor
Ex: Max. rpm = 3000 rpm for X-axis, Pitch = 5 mm/rev, Gear Ratio = 5/1
Fmax = 0.95 * 3000 * 5 / 5 = 2850 mm/min
Therefore, it is recommended to set Traverse Speed =2850.
Machine Resolution =
(Pitch of Ball - screw)
(Encoder Pulse) * (MF)
*
1
GR