Metal Boring Machines

Metal Boring Machines

Metal Boring Machines - There was not a great demand for accuracy in bored holes till 1775. Cannons were using cannon balls in the as cast condition, so the carefully cored holes, after being cleaned out, proved satisfactory. However, the coming of the steam engine put much higher requirements on machining capabilities. Watt, Smeaton and others began designing and building machines which could bore holes accurately in large and heavy parts such as engine cylinders.

Introduction

Boring is the process of using a single point tool to enlarge and locate a previously made hole. Drills tend to wander or drift, thus, where greater accuracy is required, drilling is followed by boring and reaming. In factories, making large pumps, turbines, railroad car wheels etc., a boring machine is an important part of the equipment.

Boring machines are one of the largest of the machine tools and are able to machine work pieces weighing up to 18000 kg. Besides enlarging previously made holes, a boring machine can be used for drilling, facing, milling etc.

The tool rotates within a stationary work piece, and is fed axially in order to cut metal for enlarging the already existing hole in the work piece