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The positioning error resulting from angular
motion and an offset between the measuring device and the
point of interest.
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The value of the offset between the measuring
device and the point of interest.
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A move referenced to a known point or
datum.
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A positioning coordinate reference where all positions are specified relative to a reference or“home” position.
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A servomotor with stationary windings in the stator assembly and permanent magnet rotor. AC brushless generally refers to a sinusoidally wound motor (such as BM series) to be commutated via sinusoidal current waveform. (see DC Brushless Servo)
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The change in velocity as a function of time.
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An absolute measurement defining the difference
between actual and commanded position
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In reference to an encoder grating, accuracy grade is the tolerance of the placement of the graduations on the encoder scale
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American Standard Code for Information
Interchange. This code assigns a number to each numeral
and letter of the alphabet. Information can then be transmitted between machines as a series of binary
numbers.
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Positioning error of the rotary stage in the vertical direction when the tabletop is oriented in the horizontal plane. Axial runout is defined as the total indicator reading on a spherical ball positioned 50 mm above the tabletop and centered on the axis of rotation.
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A center line about which rotation occurs.
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A component of bidirectional repeatability, it is the non-responsiveness of the system load to reversal of input command.
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A precision device for translating rotary motion into linear motion. A lead screw is a lower cost, lower performance device performing the same function. Unit consists of an externally threaded screw and an internally threaded ball nut
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The linear distance a carriage will travel for one revolution of the ball screw (lead screw).
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A measurement of the capacity of a network to transmit data. Typically expressed in bits-per-second or bytes-per-second.
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A measure of the maximum supported encoder signal data rate. Typically expressed in counts-per-second or Hz.
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A measure of the frequency interval over which the output/input ratio of a filter stays above -3dB. Typically expressed in Hz.
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The number of bits transmitted per second on a
serial communication channel such as RS-232 or modem.
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A support mechanism allowing relative motion between two surfaces loaded against each other. This can be a rotary ball bearing, linear slide bearing, or air bearing (zero friction).
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Repeatability is the maximum deviation from the mean (each side) when repeatedly approaching a position. Unidirectional repeatability refers to the value established by moving toward a position in the same direction. Bidirectional repeatability refers to the value established by moving toward a position in the same or opposite direction.
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A number system using four bits to represent 0-F (15).
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A broad term relating to any system where the output is measured and compared to the input. Output is adjusted to reach the desired condition.
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The process of directing electrical current to the motor phases based on the motor position. This process makes sure the motor produces the maximum torque or force. In brushed motors, mechanical parts switch the current. In brushless motors and stepper motors, the drive firmware and hardware control the commutation. The drive uses sensor feedback or open-loop commands to direct the current.
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The motor position within one electrical cycle, measured from 0 to 360 degrees. For rotary motors, the electrical angle is different from the mechanical rotation angle of the motor. For example, if a rotary motor has eight magnets (four pole pairs), the electrical angle changes 360 degrees during 90 degrees of mechanical rotation.
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The sequence of magnetic field changes that returns the motor phases to their starting state. For both linear and rotary motors, one cycle occurs over the spacing of two permanent magnets (one pole pair - see the MotorPolePitch Parameter for more information on poles).
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The maximum deviation from the mean (each
side) when repeatedly approaching a position.
Unidirectional repeatability refers to the value established by moving toward a position in the same direction. Bidirectional repeatability refers to the value established by moving toward a position in the same or opposite direction.
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Repeatability is the maximum deviation from the mean (each side) when repeatedly approaching a position. Unidirectional repeatability refers to the value established by moving toward a position in the same direction. Bidirectional repeatability refers to the value established by moving toward a position in the same or opposite direction.
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