Determination of Location
According to Aderoba (1994), the determination on location can be enumerated as follows:
- An important aspect of the design is concerned with the location of the component. The correct location influences the accuracy of the finished result, and particularly its positional relationship with other surfaces on the component.
- Unless location arrangements are reliable and consistent, the jig will not produce uniform components and all the reasons for using the jig will be nullified.
- The principles of location account for six degrees of freedom, which must be constrained against movement. The location of the job under review is done by the use of a post locator and is about 140 mm long and 44 mm wide. This is considered not to be a long locator. It is designed in such a way that it will be convenient for the user and for the purpose of assemblage. Clamping screw A is provided for this purpose of assemblage. The post locator is solid post, but there is a hole drilled at the middle of a dimension shown to allow the depth of the pre-set drill to be reached. There is another supporting screw B used to support the work during drilling.
- The tolerance provided on the two locators is 10.01 mm.
- The clearance between the job and the post locator is a push, sliding, neutral or transition, where small amounts of clearance or interference can be tolerated given the fair ease of assembly and accurate location, it can easily be pushed into position or assembled by just a hand pressure.
- The positioning of the top clamp, which is the cover with the aid of screw A, and the main frame of the jig Technical Report 189
give a resistance to the cutting force of
the drill.
- The clamp was designed in such a way
that it is an integral part of the jig
body. With the tolerance provided by
the designs, the clamps in use are easy
to assembly and natural to use and
remove.