Telescopic gauges are popular for fine work as they are very rigid and have a better ‘feel’.
Telescopic Gauge Uses
Used for measuring the sizes of holes, slots and recesses
Construction of Telescopic Gauge
Telescopic gauges are ‘T’ shaped. They consist of a pair of telescopic legs or plungers connected to a handle. The plungers are spring-loaded to force them apart. After inserting the gauge in a hole or slot, it can be locked in position by turning the knurled handle. It may then be withdrawn from the hole and measured with a micrometer.
Telescopic gauges are available in a set of 6 nos, to measure holes from 8 mm to 150 mm. (as per MITUTOYO Series 155)
No.1 8.0 mm to 12.7 mm
No.2 12.7 mm to 19.0 mm
No.3 19.0 mm to 32.0 mm
No.4 32.0 mm to 54.0 mm
No.5 54.0 mm to 90.0 mm
No. 6 90.0 mm to 150.0 mm