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|USING A CENTRE LATHE AS AN AID TO MANUALLY CUTTING EXTERNAL THREADS
|V.Ryan © 2019
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|TAILSTOCK DIE HOLDER
|The Tailstock Die Holder shown opposite, is used to manually cut a thread, when using a centre lathe. The use of this die ‘stock’, will be explained later.
|If a centre lathe is available, the die/stock can be ‘held’ between the tailstock spindle and the metal being threaded. This is shown in the diagram below. This has the effect of keeping the thread straight and level, during the thread cutting process.
The steel to be threaded must have a chamfer, to help start the thread. CHECK THAT THE LATHE IS ISOLATED (for safety).
The die in its stock, is placed on the chamfer and the tailstock spindle is pressured against the die, using the tailstock handle, holding the die firmly in place. The chuck is rotated slowly a couple of rotations by hand and the cutting of the thread begins. The tailstock handle is turned again, which continues the pressure on the die, against the steel. This procedure continues until the entire thread is cut.
This techniques takes a little practice, but it is one effective way of ensuring that the finished thread is straight.
|This ‘lathe’ technique, is improved by the use of a tailstock die holder, as seen below. The holder fits into the tailstock and the die holder section rotates, through the use of a ‘tommy’ bar. This is easier than using a regular stock type die holder.
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