- Rotary table
A rotary table is a precision work positioning device used in metalworking. It enables the operator to drill or cut work at exact intervals around a fixed (usually
horizontalor vertical) axis. Some rotary tables allow the use of index plates for indexing operations, and some can also be fitted with dividing plates that enable regular work positioning at divisions for which indexing plates are not available. A rotary fixture used in this fashion is more appropriately called a dividing head( indexing head).
The table shown is a manually operated type. Powered tables under the control of
CNCmachines are now available, and provide a fourth axis to CNC milling machines. Rotary tables are made with a solid base, which has provision for clamping onto another table or fixture. The actual table is a precision-machined disc to which the work piece is clamped (T slots are generally provided for this purpose). This disc can rotate freely, for indexing, or under the control of a worm (handwheel), with the worm wheel portion being made part of the actual table. High precision tables are driven by backlash compensating duplex worms.
The ratio between worm and table is generally 40:1, 72:1 or 90:1 but may be any ratio that can be easily divided exactly into 360°. This is for ease of use when indexing plates are available. A graduated dial and, often, a
vernier scaleenable the operator to position the table, and thus the work affixed to it with great accuracy.
A through hole is usually machined into the table. Most commonly, this hole is machined to admit a
Morse tapercenter or fixture.
Rotary tables are most commonly mounted "flat", with the table rotating around a vertical axis, in the same plane as the cutter of a vertical
milling machine. An alternate setup is to mount the rotary table on its end (or mount it "flat" on a 90° angle plate), so that it rotates about a horizontal axis. In this configuration a tailstock can also be used, thus holding the workpiece "between centers."
With the table mounted on a secondary table, the workpiece is accurately centered around the rotary table's axis, which in turn is centered around the cutting tool's axis. All three axes are thus
coaxial. From this point, the secondary table can be offset in either the X or Y direction to set the cutter the desired distance from the workpiece's center. This allows concentricmachining operations on the workpiece. Placing the workpiece eccentrically a set distance from the center permits more complex curves to be cut. As with other setups on a vertical mill, the milling operation can be either drilling a series of concentric, and possibly equidistant holes, or face or end milling either circular or semicircular shapes and contours.
A rotary table can be used:
* To machine spanner flats on a bolt
* To drill equidistant holes on a circular flange
* To cut a round piece with a protruding tang
* To create large-diameter holes, via milling in a circular toolpath, on small milling machines that don't have the power to drive large twist drills (>0.500"/>13 mm)
* To mill
* To cut complex curves (with proper setup)
Additionally, if converted to
stepper motoroperation, with a CNC milling machineand a tailstock, a rotary table allows many parts to be made on a mill that otherwise would require a lathe.
* [http://www.fignoggle.com/machines/x2mill/howTo-setupRotaryTable.htm How to center a rotary table on a mill table.]
* [http://www.jjjtrain.com/vms/mill_rotary/mill_rotary_00.html How to use a rotary table]
* [http://www.intellidrives.com/rotary-table-RotoRing.HTM Rotary Tables ]
* [http://www.intellidrives.com/xy-table-XYThetaWorkcells.htm XY Tables ]
Wikimedia Foundation. 2010.
Look at other dictionaries:
rotary table — rotary table, a heavy steel turntable which turns the bit in drilling for oil … Useful english dictionary
rotary table — sukamasis stalas statusas T sritis automatika atitikmenys: angl. rotary table vok. Drehtisch, m rus. поворотный стол, m pranc. table tournante, f … Automatikos terminų žodynas
Rotary table (drilling rig) — A [http://www.glossary.oilfield.slb.com/Display.cfm?Term=rotary%20table Rotary table] is a mechanical device on a drilling rig that provides clockwise (as viewed from above) rotational force to the drill string to facilitate the process of… … Wikipedia
rotary table oven — noun : an oven comprising one or more horizontal circular tables on a vertical axis that turns so that work can be introduced at one radial position and removed at another after heat and rotation have completed the process … Useful english dictionary
Rotary — Rotation Rotary can refer to: * Rotary dial, a rotating telephone dial * Rotary engine, a type of internal combustion engine from the early 20th century * Rotary International, a service organization * Rotary milking shed, a type of milking shed… … Wikipedia
Rotary stage — A rotary stage is a component of a motion system used to restrict an object to a single axis of rotation. The terms rotary table or rotation stage are often used interchangeably with rotary stage. All rotary stages consists of a platform and a… … Wikipedia
table tournante — sukamasis stalas statusas T sritis automatika atitikmenys: angl. rotary table vok. Drehtisch, m rus. поворотный стол, m pranc. table tournante, f … Automatikos terminų žodynas
rotary milling machine — noun : a milling machine having a rotary table and one or more cutters … Useful english dictionary
Table saw — A table saw, equipped for cutting large pieces of sheet stock. Other names Sawbench Classification Power tool Manufacturer Bosch, Makita … Wikipedia
rotary — [ rɔtari ] n. m. • 1931; mot angl.; lat. rotarius, de rota « roue » ♦ Anglic. Techn. 1 ♦ Appareil de sondage par rotation. 2 ♦ (1953) Système de téléphone automatique. Des rotarys. ● rotary nom masculin (anglais rotary, rotatif) … Encyclopédie Universelle