Page 85 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Solid jig

This can be used while drilling small piece parts. The body of this type of jig is machined from a solid block of
steel. (Fig 12)

Fig 12

Post jig
This is used for location from a bore. The post should be as short as possible to facilitate loading and at the same
time it must be long enough to support the workpiece. (Fig 13)

Fig 13

Trunnion jig

This can be used when large or awkwardly shaped workpieces are to be drilled from different directions. This is a
further modification of the box jig which is carried on trunnions and rotated from station to station and positioned,
using an indexing device. (Fig 14)

Fig 14

A jig is a special device which holds, supports, locates and also guides the cutting tool during operation. Jigs are
designed to accommodate on or more components at a time.
Jigs are available for drilling or boring.
Drilling jigs are used to drill , ream, tap and to perform other allied operations. (Figs 15 & 16)

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CITS : C G & M - Fitter - Exercise 66