Installation manual
CNC 8035
CONCEPTS
Gear ratio management on axes and spindle
5.
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
·253·
CAN axes
1. External feedback connected to the CNC
- A.m.p. DRIBUSLE (P63) = 0.
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.
Parameters involved in the calculation of position feedback.
With encoder:
• A.m.p. NPULSES (P8) = number of pulses per turn of the encoder = 18000.
• A.m.p. SINMAGNI (P10) = Multiplying factor if the encoder is sinusoidal = 1.
• A.m.p. EXTMULT (P57) = Multiplying factor of the feedback = 1.
• A.m.p. PITCHB (P86) = Leadscrew pitch = 20.
With linear encoder:
• A.m.p. PITCH (P7) = linear encoder pitch = 20.
• A.m.p. NPULSES (P8) = 0.
• A.m.p. SINMAGNI (P10) = Multiplying factor if the encoder is sinusoidal = 0.
• A.m.p. EXTMULT (P57) = Multiplying factor of the feedback = 20/4 = 5.
Calculation of the velocity command for a G00FEED feedrate:
Velocity command = (G00FEED x INPREV) / (PITCHB x OUTPREV) = (20000 x 3) / (20 x 1)
= 3000 rpm.
Calculation of the resulting resolution:
TTL encoder: Resolution = PITCHB / (4 x NPULSES)
Sinusoidal encoder: Resolution = PITCHB / (SINMAGNI x NPULSES)
TTL linear encoder: Resolution = PITCH / 4
Sinusoidal linear encoder:Resolution = PITCH / SINMAGNI
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