Fagor CNC 8035 - Example of Spindle: External Encoder with Gear Box

 Installation manual
CNC 8035
5.
CONCEPTS
Gear ratio management on axes and spindle
(SOFT M: V15.3X)
(S
OFT T: V16.3X)
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5.15.6 Example of spindle: external encoder with gear box
A spindle with 4 gears. The maximum speeds and gear ratios for each range (gear) are:
Gear 1: maximum speed 1000 rpm, gear ratio 4:1.
Gear 2: maximum speed 2000 rpm, gear ratio 2:1.
Gear 3: maximum speed 3000 rpm, gear ratio 4:3.
Gear 4: maximum speed 3500 rpm, gear ratio 1:1.
The encoder is an HOP model (Vpp) and provides 18,000 pulses per turn and a 2-to-3 gear ratio.
CAN spindle
1. External encoder connected to the CNC
- A.m.p. DRIBUSLE (P63) = 0.
Parameters involved in the calculation of velocity command:
- S.m.p. MAXGEAR1 (P2) = maximum rpm of the first gear = 1000.
- S.m.p. MAXGEAR2 (P3) = maximum rpm of the second gear = 2000.
- S.m.p. MAXGEAR3 (P4) = maximum rpm of the third gear = 3000.
- S.m.p. MAXGEAR4 (P5) = maximum rpm of the fourth gear = 3500.
- A.m.p. INPREV1 (P72) = Input revolutions of the first gear =4.
- A.m.p. INPREV2 (P74) = Input revolutions of the second gear =2.
- A.m.p. INPREV3 (P76) = Input revolutions of the third gear =4.
- A.m.p. INPREV4 (P78) = Input revolutions of the fourth gear =1.
- A.m.p. OUTPREV1 (P73) = output revolutions of the first gear =1.
- A.m.p. OUTPREV2 (P75) = output revolutions of the second gear =1.
- A.m.p. OUTPREV3 (P77) = output revolutions of the third gear =3.
- A.m.p. OUTPREV4 (P79) = output revolutions of the fourth gear =1.
Parameters involved in the calculation of position feedback.
- S.m.p. NPULSES (P13) = number of pulses per turn of the encoder
= 18000 / (3 / 2) = 12000. (Only integers are allowed).
- S.m.p. SINMAGNI (P65) = Multiplying factor if the encoder is sinusoidal = 1.
Analog spindle
Parameters involved in the calculation of velocity command:
- S.m.p. MAXGEAR1 (P2) = maximum rpm of the first gear = 1000.
- S.m.p. MAXGEAR2 (P3) = maximum rpm of the second gear = 2000.
- S.m.p. MAXGEAR3 (P4) = maximum rpm of the third gear = 3000.
- S.m.p. MAXGEAR4 (P5) = maximum rpm of the fourth gear = 3500.
- S.m.p. MAXVOLT1 (P37) = maximum velocity command for the first gear = 9500.
- S.m.p. MAXVOLT2 (P38) = maximum velocity command for the second gear = 9500.
- S.m.p. MAXVOLT3 (P39) = maximum velocity command for the third gear = 9500.
- S.m.p. MAXVOLT4 (P40) = maximum velocity command for the fourth gear.
= 9500 x 3500 rpm / 4000 rpm = 8312.