Page 83 - CITS - Fitter Trade Practical - Volume -2

FITTER - CITS

Sandwich jig

This is ideal for thin or soft workpieces which may bend or warp due to force while machining. In this type of jigs,
the component will be sandwiched between the base plate and the drill plate. (Fig 5)

Fig 5

Angle plate jig

These jigs are used to hold work which are to be drilled at right angles to their mounting locators. (Fig 6)

Fig 6

Modified angle plate jig
These jigs are used for drilling at angles other than 90°. (Fig 7)

Fig 7

Box jig
This is made in the form of a box or a frame work. The component is located and clamped at one position but
drilling can be done from different directions as required. When a box jig contains bushings on two or more sides
for drilling from different directions, it is called a tumble jig. (Fig 8) This jig is meant for small components only.
Channel jig
They are the simplest form of box jigs.

The workpiece is held between two sides and machined from the third. (Fig 9)
Latch or leaf jig
This type of jig will have a hinged cover with the latch clamps for easy loading and unloading of components. The
cover with latch must be positively located and clamped so that the bushes are accurately located with respect to
the component. (Fig 10)

68

CITS : C G & M - Fitter - Exercise 66