A rotary table is an exact measurement and position-setting device often used in metal working. It allows the operator to accurately drill or cut a work in precise intervals around a predetermined axis. A rotary table can be either a table with fixed horizontal or vertical positions or a hand-held model that can be rotated and manipulated. Rotary tables are primarily used for working with metals, however they are also used for wood works. The most common materials to be worked on using this device are iron, steel, brass and aluminum. It is designed with a spindle which is rotatable and has pins that work to push the pins in one direction or another.
The rotary table works with a number of axes. There are the X axis, Y axis and the rotation of the workpiece on the table axis. The X axis positions move the workpiece in a straight line between the two axis. Y axis moves the workpiece in a clockwise and counterclockwise direction.
One of the advantages of using rotary tables is that there is little chatter, or movement, when the work is moved along the axis. This can greatly reduce mechanical errors that can occur in other devices such as a drill press. However, some rotary tables do generate sparks when the workpiece is moved at an angle. This can be reduced by using pre-made bushings. This reduces sparks but it may not prevent them entirely.
Rotary drill presses use a shaft to move a drill bit from its stationary position to the work piece. They come in several designs and various types of accessories. Most drill presses have a screw jack fastener on the bottom. The screw jack is used to keep the milling machine stable. All rotary table fasteners must be checked for proper setting before use.
The most conventional and simple design of a rotary table uses two vertically aligned surfaces on which to rotate the workpiece. A third surface, usually the back of the workpiece, is designed to catch any slipping action that may occur. A motor drives the rotation shaft through the workpiece, and the workpiece rotates on the fixed horizontal axis. The electrical motor provides power for the motor to move the shaft to the fixed position. Most rotary tables are powered by electrical motors; others use gasoline engines.
The most complicated designs incorporate three separate rotary shafts and several different speeds for each shaft. This allows for more precise positioning of the workpiece while providing a smooth continuous operation. The most complex designs of a rotary table can also incorporate other features such as a variety of speeds and a variety of shafts with different heads. Some tables allow for programming of alternate speed settings as the base speed and the speed at which the head is rotated varies. Computer software is available to control the operation of a rotary table.