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Posted on Sep 10, 20202
The rotary table indexer is a process in which, after repeated angular displacement during the machine cycle, it comes to a standstill. The rotary indexing table is specially designed to perform repetitive movements around the platform. Basically, these are high-precision work positioning devices that index parts to be machined or machined in multiple operations.
The drive ring is a high-resolution indexing system. It is characterized by a precision of +/- 11 sec. Arc, repeatability up to +/- 1.2 sec. Arc and can handle loads up to 1,575 kN and speeds up to 94 rpm.
The rotary indexing table is an integrated motion system. They usually consist of motors and mechanical power transmission devices along with encoders, sensors and drivers. The tables use electric motors for cam drives or servo tables. Mechanical cam indexers are relatively cheap and index only for setting angles, but are capable of precise movement.
Important parameters for rotary index tables are the required application resolution (or smallest increment to be moved or measured), the required repeatability and accuracy, and other mechanical parameters such as acceptable levels of backlash or hysteresis. Another key parameter is the load including moments, axial, radial and moment loads. They can affect the type and size of the indexer used in your application.
The rotary indexing table can be used in a wide variety of applications including manufacturing, inspection, and assembly tasks. For example, machines for assembly, processing and bottling use indexers. They typically take one piece to work areas or move sets of relatively small parts around the station for sequential machining or assembly tasks.
The rotary indexing table is a precision work positioning device used in metalworking. It allows the operator to drill or cut at exact intervals around a fixed location (usually horizontal or 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).Read more : Smart Manufacturing & Rotary Table Indexing
The table shown is a manually operated type. CNC-controlled power tables are now available and provide the fourth axis for CNC milling machines. Rotary tables are made of a solid base with the possibility of mounting on another table or handle. The actual table is a precisely machined disc to which the workpiece is mounted (usually T-slots are used for this purpose). This disc is free to rotate for indexing or under the control of the worm (handwheel), part of the worm wheel being part of the actual table. High precision tables are driven by double backlash compensation screws.
The screw-to-table ratio is typically 40: 1, 72: 1, or 90: 1, but it can be any ratio that can be easily divided into exactly 360 °. This is to make indexing easier to use plates are available. A graduated dial and, often, a vernier scale enable the operator to position the table, and thus the work affixed to it with great accuracy.
A through-hole is usually made in the table. Most often this hole is machined to the center of a Morse taper or fixture.
Rotary tables are most often mounted "flat", with the table rotating around a vertical axis, in the same plane as the vertical milling machine. An alternative configuration is to mount the turntable indexer at its end (or mount it "flat" on the plate at a 90 ° angle) so that it pivots about a horizontal axis. A tailstock can also be used in this configuration to hold the workpiece "between centers".
With the table mounted on the auxiliary table, the workpiece is exactly centered on the axis of the rotary table, which in turn is centered on the axis of the cutting tool. So all three axes are coaxial. From now on, the auxiliary table can be moved anywhere X or Y direction to position the cutter at the desired distance from the center of the workpiece. This allows concentric machining operations on the workpiece. Placing the workpiece off-center at a certain distance from the center allows you to cut more complex curves. As with other vertical milling setups, the milling operation can be either drilling a series of concentric and possibly even hole spacing, or face or end milling of circular or semicircular shapes and contours.
You can use an indexer with a rotary table:
• For machining the flat bars of the key on the screw
• For drilling evenly spaced holes on a round collar
• To cut a round piece with a protruding pin
• For creating large diameter holes by milling in a circular tool path on small milling machines that do not have the power to drive large twist drills (> 0.500 "/> 13 mm)
• For the milling of helices
• To cut complex curves (with appropriate configuration)
• for cutting straight lines at any angle
• for cutting arcs
With an additional folded table on the turntable, the user can move the center of rotation to any place on the part being cut. This allows the arc to be cut anywhere in the part.
for cutting round pieces
Additionally, when switching to stepper motor operation with a CNC milling machine and a tailstock, the rotary table indexer allows you to make multiple parts on a milling machine that would otherwise require a lathe.
Rotary tables have many applications, including the manufacturing and inspection of critical components in the aerospace, automation, and science industries. The use of turntables goes all the way to the film and animation industry, used to achieve accuracy and precision in filming and photography.
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