Jigs and Fixtures 203
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d:\N-Design\Des14-1.pm5
14.3.4.5 Bush Clearance
After fitting the bush in the jig body, there should be sufficient clearance left between the bush
and the work piece to permit the chip flow during the machining operation (Fig. 14.4) and also
burr clearance for ductile materials.
Work piece POOR
Work piece GOOD
Fig. 14.4 Bush clearance
14.4 Various Types of Jigs
Depending upon the construction and method of operation; drill jigs can be broadly classified
as follows:
1. Plate jigs and channel jigs,
2. Angle plate jigs,
3. Turn over jigs,
4. Leaf or latch jigs,
5. Box jigs, and
6. Trunion type indexing jigs.
14.4.1 Channel Jig
Figure 14.5 shows the assembly drawing of a channel jig with work piece in position.
Bush
Locator
Clamp
Work piece
Fig. 14.5 Channel jig
