LATHE OPERATIONS - OD1645 - LESSON 1/TASK 3
opposite the index. When cutting odd number threads, the half-nuts can be
reengaged when any numbered line is opposite the index. To cut all threads
having a half a thread per inch (such as 11 1/2 threads per inch), the half-
nuts can be reengaged when any odd numbered line is opposite the index.
THREAD CHASING DIAL.
(5) Some lathes are equipped with a thread chasing stop bolted to the
carriage of the lathe. It is used to position the cutting tool.
(6) When the thread is cut, the end of it must he finished in some way.
The most common means of finishing the end of the threaded workpiece is with
a specially ground bit or a 45 angle chamfer cutting bit.
To produce a
rounded end, a cutter bit with the desired shape will need to be specially
ground for that purpose.