(Sunnen: St. Louis) -- Sunnen Products will introduce and demonstrate bore gauges with new large-readout electronic indicators. Highly visible in the shop environment and a quick reference for multitasking operators, the new electronic dial bore gauges feature precision indicators with six-digit LCD readouts, 11-mm character height, and three large buttons for easy operation. Capable of checking bore sizes from 0.054 in. (1.37 mm) to 12 in. (300 mm), and bore lengths up to 24 in. (600 mm), Sunnen’s electronic bore gauges allow users to set upper and lower tolerance limits for go/no go judgments, which are then displayed in full-size characters. Standard analog indicator-equipped gauges read out in tenths (0.002 mm); models with five-tenths (0.010 mm) readouts are also available. Operators can easily toggle between inches and metric measurement readouts.

The electronic indicator dial bore gauges, accurate to ±0.00012 in. (±0.003 mm) with 0.00005 in. (0.001 mm) resolution, allow users to perform scaling calculations, judge tolerance, hold data, and perform general comparison measurements. Internal calculations using a simple [F(x) = Ax)] formula are also possible. The gauges are ideal for shops honing production runs of parts that require statistical process control (SPC) data at multiple points in the bore. Data output via SPC cable enables direct transfer of bore measurements to a computer for use with SPC software.

The indicator face displays the spindle’s absolute position via an absolute linear encoder capable of relocating the origin, even after the power is turned off, for quick-start, multipoint measurement. The positive/negative count resulting from the spindle’s up-and-down movement can be toggled, and the indicator face can be rotated 330° for easy reading at virtually any angle.

Gauge centralizers are adjustable to ensure proper centralization over the entire diameter range, resulting in accurate centering action, even if the gauge is tilted off the bore axis. A right-angle attachment is available for conditions where the gauge is difficult to read, or total gauge height is an issue. Blind hole probes and probe extensions are also available. Probe extensions are 2.5 in. (63.5 mm) long, and up to three extensions can be assembled together.

Most models feature all-carbide gauging points for applications where exposure to extreme wear conditions—such as heavy production, rough workpieces, or abrasive materials—is a factor. All dial bore gauges are designed for the machining environment with a dust and water protection level of IP42 or IP53. Battery life, under normal use, is approximately 5,000 hours.

Additional information on electronic dial bore gauges is available from Sunnen Products.