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

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
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