Fagor CNC 8035 - Example of Axes: Encoder at the Motor

 Installation manual
CNC 8035
CONCEPTS
Gear ratio management on axes and spindle
5.
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·255·
5.15.2 Example of axes: encoder at the motor
If the maximum feedrate for an axis is 20 m/min, with a leadscrew pitch of 20 and a 3-to-1 gear ratio
between the motor and the leadscrew. The motor encoder provides 2500 pulses per turn.
CAN axes
- A.m.p. DRIBUSLE (P63) = 1.
Parameters involved in the calculation of velocity command:
- A.m.p. G00FEED (P38) = Maximum feedrate of the axis = 20000.
- A.m.p. PITCHB (P86) = Leadscrew pitch = 20.
- Motor gear ratio:
A.m.p. INPREV (P87) = Input revolutions =3.
A.m.p. OUTPREV (P88) = Output revolutions = 1.
- NP121 (drive) = it automatically loads the value of a.m.p. INPREV (P87) of the CNC.
- NP122 (drive) = it automatically loads the value of a.m.p. OUTPREV (P88) of the CNC.
- NP123 (drive) = it automatically loads the value of a.m.p. PITCHB (P86) of the CNC.
Calculation of the maximum speed of the motor for a G00FEED feedrate:
Maximum motor speed = (G00FEED x INPREV) / (PITCHB x OUTPREV)
= (20000 x 3) / (20 x 1) = 3000 rpm.
Analog axes
Parameters involved in the calculation of velocity command:
- A.m.p. G00FEED (P38) = Maximum feedrate of the axis = 20000.
Parameters involved in the calculation of position feedback.
- A.m.p. NPULSES (P8) = number of pulses per turn of the encoder = 2500.
- A.m.p. PITCHB (P86) = Leadscrew pitch = 20.
- Motor gear ratio:
A.m.p. INPREV (P87) = Input revolutions =3.
A.m.p. OUTPREV (P88) = Output revolutions = 1.
MOTOR
ENCODER
TABLE
LEADSCRE