Boring Heads

Boring Heads

Boring Heads - A boring, head becomes necessary in two circumstances:

(a) If the diameters of the boring bar and that of the bored holes are so much different that the cutter would have excessive overhang.

(b) When it is required to after the position or the cutter or cutters along the bar a frequent demand in turret lathe operations

For boring large holes, it is often impossible to use a bar with inserted cutters. Thus for such work as boring large cylinders the cutters are held in a boring head, mounted on as stiff a boring bar as is allowable. The head is made up of cast iron.

Boring heads provide the best way to machine round accurately sized, straight holes with fine finishes. A micro meter dial provides precision adjustment of tool.

A boring head may have a number of cutters or boring tools. The advantage of having several cutters is that the work of removing a given amount of metal in boring is distributed and holes can be bored more quickly with a multiple cutter head, although more power is required to drive the boring bar.

Boring heads are often provided with two sets of cutters, one set being used for roughing and the other for finishing. The end of boring head which carries the boring tool is adjustable radially so that holes of different sizes may be bored.

Shows a double cutter head (elevation and side view) on the boring bar and shows adjustable tools set at an angle on the head to reach the end of a blind hole.

A - Double Cutter Head

B - End of a Blind Hole

Boring cutter beads are not necessarily mounted on boring bars but may be bolted on a facing slide or on the front face of the spindle socket the cutting action being obtained by the traversing table.