Measuring Gauges

The Inspection Mandrels are made of hardened and stabilized steel.
For easy usage and accuracy the Mandrels are provided with properly ground and lapped centers, recessed at both ends for protection from damage.
The 4 reference lines ( r ) are spaced 90 degree apart on the mandrel cycliner (ref. 1,2,3,4 in fig 2) for use in testing machines.
In Morse and Metric Tapers, the Mandrels are self holding in the socket (ref. fig. 2 ). A threaded hole is provided to fit a nut to extract the Mandrel from the socket.
In Steel or ISO Tapers, a tapped hole is provided for fixing the mandrel with a threaded retaining pin (ref. fig.3).To avoid Mandrel cylinder surface from being ' turned ' (by grinding) the Mandrel has an extension ( ref. P in fig.4) 14 to 32 mm in length and of slightly less diameter than of the Mandrel cylinder.