Page 77 - 05. Subyek Teknik Mesin - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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62 Automobile mechanical and electrical systems

required diameter of the thread and is machined with a taper. This allows the die
to start cutting the rod gently, before it cuts enough thread to pull itself along.
Adjusting screws on some types of die allow them to be closed or opened
slightly to allow small variations in size. Split dies can be adjusted by screws
in the die holder. The action used to cut the thread is similar to that used when
tapping.
Die nuts have no split for resizing and are made from a hexagonal bar so that
a wrench or spanner can be used to turn them. Die nuts are used to clean up
existing threads and should not be used to cut new threads.

1.6.7 Joining

It is very important for the correct methods of joining to be used in the
construction and repair of a modern motor vehicle. Joining can cover many
aspects, ranging from simple nuts and bolts to very modern and sophisticated
adhesives ( Figs 1.88 and 1.89 ).
The choice of a joining method for a repair will depend on the original method
used as well as consideration of the cost and strength required. Table 1.26 shows

Figure 1.88 A selection of joining or fastening components

Figure 1.89 Pop rivets