GSK 980MDc, User Manual

Page: 376 / 473

Chapter 4 Machine Debugging
357
Ⅲ
Inst
allation
CMR
CMD
Z
Z
D
M
× × =
δ α
CMR: command multiplier coefficient of the spindle
CMD: command frequency division coefficient of the spindle
α
：
Pulse volume, motor rotation angle for a pulse
δ
：
Min. input command unit of CNC (output angle corresponding to a pulse), (0.001°, 0.01°, 0.0001°)
This value corresponds to the travel amount of a revolution of the spindle (related parameters 5216
or 1260). If 170 is set to 1000,
δ =360 /1000=0.360
°
Z
M
：
Gear teeth of lead screw
Z
D
：
Gear teeth of motor
Calculation formula of spindle servo drive unit:
Parameter 12, 13 of drive unit correspond to the pulse frequency division numerator of position
command respectively. The calculation formulars for pulse frequency division denominator of position
command and gear ratio of drive unit are as follows:
C N G P
× × = ×
4
And
：
CMR
CMD
Z
Z
C
C N
P
C N
G
D
M
× × ×
×
= × × × =
× ×
=
δ
α
360
4
360
4
4
P: Correspondence between required pulse amounts for motor rotates 360 degrees and CNC
end:
α
/ 360
=
P
G: Electronic gear ratio of drive unit, G= position command pulse frequency division
numerator/ position command pulse frequency division denominator
N: Set motor rev number to 1
C
：
Wire number of feedback encoder
4.4 Acceleration&deceleration Characteristic Adjustment
Adjust the relative CNC parameters according to the factors such as the drive unit, motor
characteristics and machine load:
Data parameter № 22: X, Y, Z, 4th, 5th axis rapid traverse rate;
Data parameter № 23: linear acceleration & deceleration time constant of X, Y, Z, 4th, 5th
axis rapid traverse rate;
Data parameter № 024: rapid traverse speed when rapid override is F0
Data parameter № 027: upper limit of axes cutting feedrate;
Data parameter № 030: Start/end speed of exponential acceleration & deceleration in cutting feeding;
Data parameter № 029: Exponential acceleration & deceleration time constant of cutting feeding;
Data parameter № 041
：
Start/end speed of exponential acceleration & deceleration in MPG/Step
feedrate;
Data parameter № 042
：
Exponential acceleration & deceleration time constant of MPG/STEP/manual
feed;
Data parameter № 026
：
Initial feedrate when power on;
Data parameter № 060
：
Acc.&dec.time constant in CS axis;