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Installation manual
CNC 8055
CNC 8055i
7.
CONCEPTS
SOFT: V02.2X
Feedback systems
Example 7:
Resolution in "degrees" with squarewave encoder
We would like to obtain a 0.0005º resolution by using a squarewave encoder mounted on a x10
reduction gear.
Since the CNC applies a x4 multiplying factor to squarewave signals, we would require an encoder
that provides the following number of pulses (lines) per turn.
Nr of pulses = º/turn / (multiplying factor x gear ratio x Resolution)
Nr of pulses = 360 / (4 x 10 x 0.0005) = 18,000 pulses/turn
Therefore:
Allthough the CNC accepts a maximum squarewave frequency of 400 kHz, when using Fagor
squarewave rotary encoders their output frequency is limited to 200 kHz; thus, the maximum
possible feedrate (F) will be:
Max. Feed = 200,000 pulses/s. / 18,000 pulses/turn)
Max. Feed = 11.111 turns/s. = 666.666 rpm
Example 8:
Resolution in "degrees" with sinusoidal encoder
We would like to obtain a 0.001º resolution by using a 3600 pulse/rev sinusoidal encoder.
We must calculate the multiplying factor "SINMAGNI" to be applied by the CNC to the pulses
provided by the encoder in order to obtain the desired resolution.
SINMAGNI = degrees per turn / (Nr. of pulses x Resolution)
SINMAGNI = 360 / (3600 x 0,001) = 100
Therefore:
The feedback frequency of Fagor rotary encoders is limited to 200 KHz.
The 8055 CNC's maximum sinusoidal feedback input frequency is 50 KHz which means that
the maximum feedrate for this axis will be:
Max. Feed = 50,000 pulses/s. / 3,600 pulses/turn)
Max. Feed = 13.8889 turns/s. = 833.33 rpm
The 8055i CNC's maximum sinusoidal feedback input frequency is 250 KHz which means that
the maximum feedrate for this axis will be:
Max. Feed = 200,000 pulses/s. / 3,600 pulses/turn)
Max. Feed = 55.5556 turns/s. = 3333.33 rpm
INCHES = 0 PITCH=36.0000 NPULSES = 18000 SINMAGNI=0
INCHES = 0 PITCH=360.0000 NPULSES =3600 SINMAGNI=100
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