Fagor CNC 8055i FL EN - Page 396

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Installation manual
CNC 8055
CNC 8055i
7.
CONCEPTS
SOFT: V02.2X
Gear ratio management on axes and spindle
Analog axes
1. External feedback connected to the CNC
 Axis parameter DRIBUSLE (P63) = 0.
Parameters involved in the calculation of the velocity command:
 Axis parameter G00FEED (P38) = Maximum feedrate of the axis = 20000.
Parameters involved in the calculation of the position feedback.
With rotary encoder:
•axis parameter NPULSES (P8) = number of pulses per turn of the encoder = 18000.
•axis parameter SINMAGNI (P10) = Multiplying factor if the encoder is sinusoidal = 200.
•axis parameter EXTMULT (P57) = Multiplying factor of the feedback = 1.
•Axis parameter PITCHB (P86) = Leadscrew pitch = 20.
•Motor gear ratio:
axis parameter INPREV (P87) = Input revolutions =3.
axis parameter OUTPREV (P88) = Output revolutions = 1.
With linear encoder:
•axis parameter PITCH (P7) = linear encoder pitch = 20.
•axis parameter NPULSES (P8) = 0.
•axis parameter SINMAGNI (P10) = Multiplying factor if the encoder is sinusoidal = 0.
•Axis parameter EXTMULT (P57) = Multiplying factor of the feedback = 20/4 = 5.
Calculation of the motor speed with a command of MAXVOLT for a feedrate of G00FEED:
Motor speed = (G00FEED x INPREV) / (PITCHB x OUTPREV) = (20000 x 3) / (20 x 1) = 3000
rpm.