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Electronic Gages

Electronic gages are family of measuring and gaging instruments based on transducers capable of converting a linear displacement into electrical signal.The electrical signal is then amplified and transformed into a suitable data format such as a digital readout.Applications of electronic gages have grown rapidly in recent years driven by advances in microprocessor technology.They are gradually replacing many of the conventional measuring and gaging devices.Advantages of electronic gages include

-good sensivity, accuracy,precision,repeatability and speed of response

-Ability to sense very small dimensions

-ease of operation

-reduced human error

-electrical signal that can be displayed in various formats

-capability to be interfaced with computer systems for data processing.

(Fundamentals of modern manufacturing:materials,models and systems 4th edition, P.Groover, p.84-85)

Ring Gages

Ring gages are used for checking cylindirical diameters.For a given application a pair of gages is usually required.One GO and the other NO-GO.Each gage is a ring whose opening is machined to one of the tolerance limits of the part diameter.For ease of handling, the outside of the ring knurled.The two gages are distinguished by the presence of a groove around the outside of the NO-GO ring.

(Fundamentals of modern manufacturing:materials,models and systems 4th edition, P.Groover, p.85)

Manual Data Input (MDI)

MDI is a method in which a machine operator enters the part program in the factory.The method involves the use of a CRT display with the graphics capability at the machine tools control.NC part programming statements are entered using a menu dirven procedure that requires minimum training of the machine tool operator.Because part programming is simplified and does not required a special staff of NC part programmers.MDI is a way for small machine shops to economically implement numerical control into their operations.

(Fundamentals of modern manufacturing:materials,models and systems 4th edition, P.Groover, p.906)

Mechanical Gages

Mechanical gages are designed to mechanically magnify the deviation to permit observation.The most common instrument in this category is dial indicator which converts and amplifies the linear movement of a contact pointer into rotation of a dial needle.The dial is graduated in small units such as 0.01 mm.Dial indicators are used in many applications to measure straightness, flatness, paralellism, squareness, roundness and runout.

(Fundamentals of modern manufacturing:materials,models and systems 4th edition, P.Groover, p.84)