Civil Engineering Reference
In-Depth Information
Fig. 12.2. Small brazed carbide boring tool.
Boring heads
A boring head usually has two or three holes to take the boring bars. Some
boring heads also have a hole in the side for use when boring large holes.
The length of the boring bar required will depend on the depth of the hole
to be bored. Keep the boring bar as short as possible to maintain the stiffness
of the tool.
In use, the boring bar should be set the same as a lathe tool so the cutting
edge is presented to the hole being bored at the correct angle. A boring bar is
much more liable to chatter in a boring head than in a lathe, so it is essential
that the tool is very sharp.
If the hole being bored is a through hole the boring bar can have a forward
leading edge, but if the hole is a blind one it needs a trailing edge so the end
of the boring bar does not hit the bottom of the hole.
