How accurate are rotary tables?
The angle is determined in 960 equally separated positions over 360 degree. One rotation is recorded both clockwise (cw) and counterclockwise (ccw). The table offers an accuracy of 2 13 arc seconds with a backlash of about 10 arc seconds.
What is the purpose of the hole in the center of a rotary table?
All rotary tables have a hole in the middle of the table. This is usually a parallel-sided hole but some, especially on smaller rotary tables it is tapered. This hole can be used to take spigots that can be used to align the rotary table or align the workpiece on the table.
How does a rotary indexer work?
Rotary indexers convey and position components during the manufacturing process. The indexing unit rotates items to a specific position, either fixed or variable. These indexers are often used to place objects at exact points around a workspace so that they can be worked on, like a circular assembly line.
How is indexing achieved when using a rotary table?
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).
How do you measure a rotary table?
The measurement method is to turn the table to an angle, both forward and reverse, then stop, lock and position, and it uses this position as a reference with rapid rotation in the same direction, locks positioning and measurement every 30 seconds.
What are the two main types of rotary table?
A rotary table can be both manually or computer numerical controlled. Certain types of rotary tables are designed to be used with indexing plates or dividing plates for specialized operations. A rotary table used together with one of these positioning plates is generally referred to as a dividing or indexing head.
What is the difference between a dividing head and a rotary table?
The main difference between the two is that a rotary table lets you rotate the work so radial or axial cuts can be made but a dividing head is just moved in increments. Therfore only the rotary table can be used for curved work.