Interpret geometric dimensions and tolerances

Understand and assess the models and symbolic language of the GD&T system indicating engineering tolerances.

decipher geometric dimensions and tolerances
clarify geometric dimensions and tolerances
interpret GD&T
explain geometric dimensions and tolerances
translate geometric dimensions and tolerances

skill/competence

cross-sector

Interpret geometric dimensions and tolerances is an essential skill of the following occupations:

Engraving machine operator: Engraving machine operators set up, programme, and tend engraving machines designed to precisely carve a design in the surface of a metal workpiece by a diamond stylus on the mechanical cutting machine that creates small, separate printing dots existing from cut cells. They read engraving machine blueprints and tooling instructions, perform regular machine maintenance, and make adjustments to the precise engraving controls, such as the depth of the incisions and the engraving speed.
Grinding machine operator: Grinding machine operators set up, program and control grinding machines, designed to apply abrasive processes in order to remove small amounts of excess material and smoothen metal workpieces by using an abrasive wheel with diamond teeth as a cutting device for very precise and light cuts. They read grinding machine blueprints and tooling instructions, perform regular machine maintenance, and make adjustments to the grinding controls, such as the depth of cuts and the rotation speed.
Lathe and turning machine operator: Lathe and turning machine operators set up, program and tend lathe and turning machines designed to cut excess metal from a metal workpiece using a hardened cutting tool moved by computer-controlled motors. They read lathe and turning machine blueprints and tooling instructions, perform regular machine maintenance, and make adjustments to the lathe controls, such as the depth of cuts and the rotation speed.
Milling machine operator: Milling machine operators set up, program and control milling machines, designed to cut excess material from metal workpieces using a computer-controlled rotary-cutting, milling cutter. They read milling machine blueprints and tooling instructions, perform regular machine maintenance, and make adjustments to the milling controls, such as the depth of cuts or the rotation speed.
Laser cutting machine operator: Laser cutting machine operators set up, program and tend laser cutting machines, designed to cut, or rather burn off and melt, excess material from a metal workpiece by directing a computer-motion-controlled powerful laser beam through laser optics. They read laser cutting machine blueprints and tooling instructions, perform regular machine maintenance, and make adjustments to the milling controls, such as the intensity of the laser beam and its positioning.
Drilling machine operator: Drilling machine operators set up, program and control drilling machines, designed to drill holes in workpieces using a computer-controlled, rotary-cutting, multipointed cutting tool, inserted into the workpiece axially. They read drilling machine blueprints and tooling instructions, perform regular machine maintenance, and make adjustments to the drilling controls, such as the depth of drills or the rotation speed.

Interpret geometric dimensions and tolerances is optional for these occupations. This means knowing this skill may be an asset for career advancement if you are in one of these occupations.

Riveter: Riveters assemble several metal parts together by riveting guns, rivet set and hammers, or by operating a riveting machine that all perform the purpose of drilling holes on the rivet shank of the metal part and of inserting rivets, bolts, into these holes in order to fasten them together.
Plasma cutting machine operator: Plasma cutting machine operators set up and operate plasma cutting machines designed to cut and shape excess material from a metal workpiece using a plasma torch at a temperature hot enough to melt and cut the metal by burning it and works at a speed that blows away the molten metal from the clear cut.
Spark erosion machine operator: Spark erosion machine operators set up and tend spark erosion machines designed to cut excess material from a metal workpiece by the use of electrical discharges, or sparks, caused by electric voltage and separated by a dielectric liquid, which removes pieces of metal from the electrodes These applications can involve transmission and optical microscopy.
Water jet cutter operator: Water jet cutter operators set up and operate a water jet cutter, designed to cut excess material from a metal workpiece by using a high-pressure jet of water, or an abrasive substance mixed with water.
Computer numerical control machine operator: Computer numerical control machine operators set-up, maintain and control a computer numerical control machine in order to execute the product orders. They are responsible for programming the machines, ensuring the required parameters and measurements are met while maintaining the quality and safety standards.
Oxy fuel burning machine operator: Oxy fuel burning machine operators set up and tend machines designed to cut, or rather burn off, excess material from the metal workpiece using a torch that heats the metal workpiece to its kindling temperature and subsequently burns it into a metal oxide upon its reaction with an emitted stream of oxygen, flowing out of the workpiece’s created kerf as slag.
Stamping press operator: Stamping press operators set up and tend stamping presses designed to form metal workpieces in their desired shape by applying pressure through the up and down movement of a bolster plate and a die attached to a stamping ram on the metal, resulting in the die producing smaller metal parts of the workpiece fed to the press.
Metal nibbling operator: Metal nibbling operators cut detailed patterns from metal surfaces by using manual or powered metal nibblers, such as a handheld nibbling drill or a nibbling machine.
Metal rolling mill operator: Metal rolling mill operators set up and tend metal rolling mills designed to form metal workpieces into their desired shape by passing them through one or several pairs of rolls in order to decrease the metal’s thickness and to make it homogeneous. They also take into account the proper temperature for this rolling process.
Thread rolling machine operator: Thread rolling machine operators set up and tend thread rolling machines designed to form metal workpieces into external and internal screw threads by pressing a thread rolling die against metal blank rods, creating a larger diameter than those of the original blank workpieces.
Extrusion machine operator: Extrusion machine operators set up, monitor and maintain machines which heat or melt raw materials, and pull or push the heated material through a shaped die to form it into a continuous profile with a preset cross section such as tubes, pipes and sheeting. They may also clean and maintain the equipment.
Straightening machine operator: Straightening machine operators set up and tend straightening machines designed to form metal workpieces into their desired shape using pressing practices. They adjust the angle and the height of the straightening rolls and select the settings for the pressing force required to straighten the workpiece, taking into account the end product’s yield strenght and size, without excess work hardening.

References

1. Interpret geometric dimensions and tolerances – ESCO