We wouldn't be able to make much in our workshops without joining things together, and using screwed fasteners has the advantage that what we join can be taken apart again. This means that something we all need to do from time to time is make our own screw threads. Although the lathe is the ideal way to cut accurate threads, most of the time we find ourselves tapping and threading (making internal and external threads) with taps and dies for both practicality (it's hard to cut very small threads) and convenience.
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