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OCTAL. A numbering system basic to computer operation. A positional notation system using 8 as a base, instead of 2, as in binary, or 10, as in decimal, etc.
OFFSET. A displacement in the axial direction of a tool which is the difference between the length established by the programmer and the actual tool length.
ONLINE. Operation of peripheral equipment that is under direct control of a central processor.
OPEN LOOP. (1) Refers to a control system in which there is no self-correcting action for misses of the desired operational condition, as there is in a closed loop system. (2) A family of automatic control units, one of which may be a computer, linked together manually by operator action.
OPEN-LOOP SYSTEM. A control system that is incapable of comparing output with input for control purposes, that is, no feedback is obtainable.
OPERATING SYSTEM. (1) A basic group of programs with operation under control of a data processing monitor program. (2) An integrated collection of service routines for supervising the sequencing and processing of programs by a computer. Operating systems may perform debugging, input-output, machine accounting, compilation and storage assignment tasks.
OPTIMIZE. The rearrangement of instructions or data in NC or computer applications to obtain the best set of operating conditions.
OSHA. Acronym for Occupational Safety and Health Act. A federal law which specifies the requirements an employer must follow in order to guard against illness and injury.
OUTPUT. (1) Printed or recorded data resulting from computer source programs. (2) Data transferred from internal storage to output devices or external storage.
OVERLOAD. A load greater than that which a device is designed to handle, possibly resulting in hardware problems.
OVERSHOOT. (1) Extent to which a servo system carries the controlled variables past their final equilibrium position. (2) For a step change in signal amplitude, undershoot and overshoot are the maximum transient signal excursions outside range from initial to final mean amplitude levels.
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