Bore gages are used to measure the inside diameter of a hole, bore, or blind hole at shallow to very deep (~0.03 inches to several feet) depths into the bore.
Micrometer heads or jig borer micrometers consist only of the spindle and drum portion (no frame or anvil). Micrometer heads are OEM components built into microscopes, machine tools, medical equipment or other metrological systems to provide precision measurement or positioning. Jig borer micrometers and end measuring rods (fixed standard) are commonly used to set spacing and table locations.
Dimensional instruments, tools, or gaging components are designed for measuring thread size, pitch, or other parameters. Thread plug gages, thread ring gages, measuring wire, thread comparator, thread gaging rolls, thread gaging spring, and STI plug gages are used for thread measurement. Calipers and micrometers with point anvils or contact tips are used for thread or serration measurement.
Other unlisted, specialized, or proprietary micrometer types such as chisel point, roller, needle stud, pin vise holder, collet holder, knife edge, spline, flute, or offset.
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Micrometers with specialized anvils that locate properly on a curved surface. Ball anvils are useful for gaging the thickness of tubes, pipes, or similar components using the ball anvil on inner diameter surface and the spindle face against the outer diameter. Tube wall gaging micrometers have a cylindrically shaped anvil face orientated perpendicular to the spindle.
Micrometers have anvil or spindle faces that step down to a smaller diameter that can fit into narrow slots, holes, or facilitate the measurement of small parts or features.
Micrometers have a pointed anvil and small V-shaped spindle face. The pointed anvils can fit into narrow thread grooves or serrations. These types of micrometers are also called thread gaging micrometers.
Micrometers have a V-shaped anvil that facilitates gaging round stock, or can detect out-of-round conditions.
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Gage sets include several gages and accessories packaged into a kit, usually in a case with adjusting tools. Tool kits sometimes contain alternate extensions and contact tips, holders, bases, or standards.
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Gages and gaging systems are based on the metric system of measurement (e.g., centimeters, millimeters).
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Devices include dial displays, column/bargraphs, and direct reading scales. Dial displays use a pointer or needle mounted in a graduated, disc dial. The dial provides an indication of dimension or position around or from a zero reference point with dial graduations or styles, such as 10-0-10, 45-0-45, 4-0-4 or 50-0-50. Column and bargraph displays provide a graphical presentation of dimensional data. Direct reading graduated scales have rulings or graduations engraved or printed onto a linear, disc, or drum surface that provides a direct indication of the gaged dimension. Vernier scales provide additional amplification or an increased level of precision (e.g., thousandths).
Digital display types present metrology data in numeric or alphanumeric form. Micrometers, calipers, and indicators are available with digital displays. Gages with digital displays often have data output capabilities using serial or other formats. Digital readouts are a precision type of digital display integrated into dimensional gages or systems.
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Gages are mounted on or within a machine tool or equipment for tool setup or travel measurement. Test indicators, dial indicators and micrometer heads are examples of gages that are often machine mounted.
The part is automatically presented to the gage and measured without operator intervention. Inline devices are automatic gages used in a production line. In semi-automatic systems, a part is presented manually to the gage or gaging system and then measured automatically.
Other unlisted, specialized or proprietary mounting or loading types.
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Micrometers, snaps gages, go / no-go plugs, setting discs or other gages have plastic, heat insulating handles or holders. Insulating handles help prevent damage to dimensional gages that could be caused by the heat from a human hand.
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Gages or gaging systems are designed to measure the travel or position changes of a machine bed, table, or stage. Micrometer heads, indicators, specialized calipers, and other OEM gages are used for machine travel indication. These gages are typically mounted on a machine or are built into a product including machine tools, microscopes, and other instruments requiring precision dimensional measurement or position control.
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