A boring bar is a tool used in metalworking and woodworking.

The boring bar is the protruding arm of the machine that holds cutting tool(s), and must be very rigid.

Cooling of the bores is done through a hollow passageway through the boring bar where coolant can flow freely.

As the workpiece is rotated, a boring bar with an insert attached to the tip of the bar is fed into an existing hole.

The hand drill was a vertical type of weighted, and counterbalanced boring bar, (used today in horizontal lathe-work boring, for example: rifle tubes).

Automotive repair Van Norman pioneered a portable boring bar that could be used to bore the cylinders of automobile engines without removing the engine from the automobile.

Instead of the lathe-(massive metal: weight and forces) doing the work, essentially the Egyptians were using a form of a vertical lathe-using gravity-weights, with the boring bar doing the cutting.

Frowning: "We really ought to be reaming it, for the finish cut-we'll use a boring bar for the six-pounders-but those cast iron cannonballs are so sloppy and uneven there's no point.

The boring bar may be supported on both ends (which only works if the existing hole is a through hole), or it may be supported at one end (which works for both through holes and blind holes).

And this old chassis had been built up so that this bearing lay on that and it was turned by and electric motor and all that and the boring bar went tool went and bored this bearing out and travelled along on its own its own It was fed off course.