TELESCOPIC GAUGES & SMALL HOLE GAUGES

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TELESCOPIC GAUGES 

The telescopic gauge is a set, range of telescopic gauges that are used to measure a bore's size, by transferring the internal dimension to a remote measuring tool. The telescopic gauges are a direct equivalent of inside calipers and require the operator to develop the correct feel to obtain repeatable results.

Telescopic gauge set is avail 12mm – 150mm, also telescopic gauges are avail individually.

The telescopic gauges are locked by twisting the knurled end of the handles, this action is performed to exert a small amount of friction on the telescopic portions of the telescopic gauge (the smaller diameter rods found at the T head of the telescopic gauge). To use, the telescopic gauge is inserted at a slight angle to the bore and gently locked to a size slightly larger than the bore while at that angle. Then, rocking the telescopic gauge handle side-to-side, slowly move the handle across the bore to the other side. The rocking will first align the gauge with the bore axis and the act of moving the handle to the other side of the bore will bring it to the exact bore diameter. This action compresses the two anvils of the telescopic gauge where they remain locked at the bores dimension after being withdrawn.

The telescopic gauge is then removed and measured with the aid of a micrometer or vernier caliper. To accurately detect the maximum distance between the two anvil heads of the telescopic gauge, move the head of the telescopic gauge around while making the measurement to insure you get the maximum reading. Grasp the telescopic gauge near the head to aid in your maneuvering of the telescopic gauge while adjusting the micrometer so it just stops the gauge's motion at one spot only. A bit of practice will quickly give you the idea.

SMALL HOLE GAUGES

Small-hole gauge set. Sizes from top to bottom:

3 to 5 mm (0.118 to 0.197 in)
5 to 7.5 mm (0.197 to 0.295 in)
7.5 to 10 mm (0.295 to 0.394 in)
10 to 13 mm (0.394 to 0.512 in)

Small-hole gauges require a slightly different technique to the telescopic gauges, the small hole gauge is initially set smaller than the bore to be measured. It is then inserted into the bore and adjusted by rotating the knurled knob at the base, until light pressure is felt when the small hole gauge is slightly moved in the bore. The small hole gauge is then removed and measured with a vernier calipers or micrometer. To accurately detect the maximal distance between the two halves of the gauge head, move the head of the gauge around while making the measurement to insure you get the maximal reading. Grasp the small hole gauge near the head to aid in your maneuvering of the small hole gauge while adjusting the micrometer so it just stops the small hole gauge's motion at one spot only. A bit of practice will quickly give you the idea.

There are two styles of small-hole gauges: full-ball and half-ball. The full-ball small hole gauges are easier to set correctly and maintain, under the pressure of measurement, a better representation of the bore. Half-ball small hole gauges tend to spring just a little bit, and this may be enough to make a measurement incorrect. A lighter "touch" is required to accurately use the half-ball small hole gauges.