- 2 Point Heads
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The Fowler Bowers 54-566-701 XT Holematic Pistol Grip Bore Gauge has a measurement range of 0.080 to 0.100" and is accurate to 0.00015". Gradient spacing is 0.00005" and the measurement depth is 0.350". This direct-measuring gauge uses a two-point contact system to detect geometry problems such as ovality and taper, and has steel contact points for high wear resistance. Self-centering heads eliminate operator influences and the pistol grip allows for single-handed operation with repeatable results. The large LCD screen swivels to make measurement readings easier. The gauge also has RS-232C output and USB connectivity as well as three preset memories.
Bore gauges measure holes, or bores, in a workpiece. They can measure the interior diameter of a hole at any depth, while internal micrometers can only measure to the depth of their teeth. Bore gauges are typically calibrated with a setting ring and come in two types: simple and direct-measuring. Simple bore gauges are used with a caliper to transfer the hole measurement, while the more complex gauges take the measurement directly, and display it through a vernier, dial, or digital display. Bore gauges have a two- or three-point contact, indicating how many points on the gauge head touch the inside of the bore. Two-point contacts are better at measuring ovality, while three-point contacts are used to measure lobing or triangular form error. Pistol-grip bore gauges are used for fast, single-handed operation with repeatable results from one operator to another. Bore gauges can also be used in special applications, such as measuring threads, spline pitch diameters, and deep bores.
The Fred V. Fowler Company manufactures inspection and measurement instruments such as electronic indicators, calipers, bore gages, and digital scales. The company, founded in 1946, is headquartered in Newton, MA.