Understanding Turning & Milling Boring
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Boring precisely enlarges existing holes in a part. Generally, boring on a turning bar is less complex than on a milling machine. A boring bar on a lathe can make any size hole if the bar will fit into the hole. Boring heads for milling machines have a limited range.
The basic boring bar is essential equipment in nearly every machine shop. Appropriate for most applications, single-edge boring bars are cost-effective with a single point of contact with the workpiece. Because the bar is unsupported vibrations or chatter can occur, which is the only significant drawback to this boring option.
The main difference between a boring bar on a lathe and a milling machine is that it requires the use of an adjustable boring head. This factor can add complexity to the setup. The basic boring head moves the boring bar’s position from the axis of the hole to achieve the specified diameter. Machinists can mount the boring bar in several different positions to bore a wide range of hole sizes with these inexpensive heads.
Boring heads are used most often with conventional milling machines, but they can be used on CNC machines. Boring on a mill lets you engage more than one cutting edge, which are frequently employed in high-production environments. There are two ways to set up dual boring heads. First, the two cutting edges are set to the same diameter, producing a faster feed rate. The second method sets the cutting edges on two different diameters, which results in more material being removed per pass.