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THREADING ON CNC LATHES
By Peter Smid
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From CNC Programming Handbook: A Comprehensive Guide to Practical CNC Programming, Second Edition
THREADING ON CNC LATHESCNC lathes can produce a very high quality thread in addition to the variety of turning and boring operations, in a single setup of the machined part. This is a very attractive feature for manufacturers and many machine shops have purchased a CNC lathe for that reason along. Any secondary operation requires additional setup, increasing the cost of production. Single point thread cutting - typically known as a single point threading - uses a tool holder similar to other tool holders, but contains one special threading indexable insert, which may have one, two or three tips. Generally, the shape and size of the threading insert must correspond to the shape and size of the finished thread - Figure 38-1.  Figure 38-1: Comparison of the thread form and the threading tool shape By definition, a single point threading is a machining process of cutting a helical groove of a specific shape with a uniform advancement per spindle revolution. The shape or form of the thread is mainly determined by the shape and mounting position of the cutting tool. The uniformity of advancement is controlled by the programmed feedrate. Form of a ThreadThe most common thread form used in CNC programming is the familiar V-thread (in the shape of the letter V) with a 60 included angle. There is a large variety of the V-shape forms in manufacturing, including metric and English threads. Other forms include trapezoidal shapes such as metric trapezoid, ACME and worm...
Copyright Industrial Press 2003 under license agreement with Books24x7
Products & Services
Thread rolling machines generate threads by displacing and flowing metal into a thread shape.
Learn more about Thread Rolling Machines
Threading dies are used to form or cut male threads on the outside of rod or bars.
Learn more about Threading Dies
Threading tools are used to form or cut screw threads.
Learn more about Threading Tools
Lathes and turning centers cut a rotating part with a stationary cutting tool. The tool moves parallel and perpendicular to the workpiece axis to provide the desired finished shape.
Learn more about Lathes and Turning Centers
Thread cutting machines generate threads by cutting and removing material to produce a thread shape.
Learn more about Thread Cutting Machines
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Topics of Interest
TERMINOLOGY OF THREADING
Threading is a relatively large subject, in fact, it is large enough to have a whole book dedicated to it. As subjects of this kind usually are, threading has its own...
(Read More)
THREADING ON CNC LATHES
In a single setup, CNC lathes can produce very high quality threads, in addition to turning, boring, grooving and other operations. This is a very attractive feature for...
(Read More)
THREADING FEED AND SPINDLE SPEED
In threading, the choice of the cutting insert, the spindle speed and feedrate selection are rather restricted. Both, the cutting tool and the feedrate are...
(Read More)
THREADING FEED AND SPINDLE SPEED
Regardless of any active cutting motion, there is always a feedrate involved - this feedrate controls how effectively the tool removes material in various operations...
(Read More)
THREADING PROCESS
Threading is one of the most automated programming tasks in modern machine shop, yet it could be one of the more difficult operations done on a CNC lathe. Initially, it may seem an...
(Read More)
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