GSK GSK980TDc, Руководство пользователя

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Chapter 4 Machine Debugging methods and Modes
413
Ⅲ
Connection
CMR: Code multiplier coefficient (data parameter No.015, No.016, No.146, No.147, No.148)
CMD: Code frequency division coefficient (data parameter No.017, No.018, No.149, No.150,
No.151)
α
: Pulse volume, motor rotation angle for a pulse
L: Screw lead
δ :
Min. input code unit of CNC(0.001mm for GSK980TDc Z axis, 0.0005mm for X axis of
GSK980TDc)
Z
M : gear teeth number of lead screw
Z
D: gear teeth number of motor
Example: if gear teeth number of lead is 50, gear teeth number of motor is 30, pulse volume
α
=0.075º, screw lead is 4mm,
The electronic gear ratio of X axis is:
The electronic gear ratio of Z axis is:
Then data parameter No.015(CMRX) =1, No.017(CMDX) =1; No.016(CMRZ) =2, No.018(CMDZ)
=1.
If the electronic gear ratio numerator is more than the denominator, the allowed CNC max. speed
will decrease. For example: the data parameter No.016(CMRZ) =2, No.018(CMDZ) =1, so the
allowed Z axis max. speed is 8000mm/min.
If the electronic gear ratio numerator is not equal to the denominator, the allowed CNC
positioning precision may decrease. For example: the data parameter No.016(CMRZ) =1,
No.018(CMDZ) =5, so the pulse is not output as the input increment is 0.004, but a pulse is output if
the input increment is 0.005.
In order to ensure the CNC positioning precision and speed index, it is suggested that the CNC
electronic gear ratio is set to 1:1 and the electronic gear ratio calculated is set to the digital servo
when matching with digital servo.
When matching with the step drive, choose the drive unit with step division function as possible
as it can, and properly select mechanical transmission ratio. The 1:1 electronic gear ratio should be
ensured to avoid the excessive difference between the numerator and the denominator of this CNC
electronic gear ratio.
4.4 ACC&DEC Characteristic Adjustment
Adjust the relative CNC parameters according to the factors such as the drive unit, motor
characteristics and machine load:
Data parameter No.022, No.023, № 155, № 156, № 157: X, Z, Y, 4
th
, 5
th
axis rapid traverse rate;
Data parameter No.024, No.025, № 158, № 159, № 160: linear ACC&DEC time constant of X, Z,
Y , 4
th
, 5
th
axis rapid traverse rate;
Data parameter No.026: X axis exponential ACC&DEC time constant in threading;
Data parameter No.028: Exponential ACC&DEC start/end speed in threading;
Data parameter No.029: Exponential ACC&DEC time constant of cutting and manual feeding;
Data parameter No.030: Exponential ACC&DEC start/end speed in cutting feeding;
BIT5 (SMZ) of bit parameter No.007: for smooth transition between cutting feedrates of adjacent
3 6 0 0 .0 0 0 5 3 6 0 5 0 1
0 .0 7 5 4 3 0 1
M
D
Z C M R
C M D L Z
δ
α
× ×
= × = × =
× ×
3 6 0
M
D
Z C M R
C M D L Z
δ
α
×
= ×
×
0 .0 0 1 3 6 0 5 0 2
0 .0 7 5 4 3 0 1
×
= × =
×