What is Dividing Head?
|Fig. 1 Universal Dividing Head|
Types of Dividing Head
- Plain dividing head
- Universal dividing head
- Optical dividing head
Plain Dividing Head
Plain dividing head is the simplest of all types of dividing heads. Plain dividing head is classified into two types.
First type Plain Dividing Head
- The first type carries an indexing plate directly mounted on its spindle and there is no use of worm and worm wheel.
- The index plate carries 12-24 equispaced slots on its periphery.
- The workpiece is held between two centers i.e. one on the dividing head spindle and the other on the tailstock.
- For locking the spindle in its position hand lever is used.
- The plate, together with the spindle can be rotated by means of hand i.e. provided on the left-hand side of the dividing head.
Second Type Plain Dividing Head
- The second type of plain dividing head uses a worm and worm wheel mechanism.
- In this indexing, the plate movement is obtained by the worm which is rotated by hand.
Plain dividing head is commonly used in operations where average accuracy is required such as fluting taps, reamers, milling rectangles, squares, hexagons, etc.
Universal Dividing Head
|Fig. 2 Internal Mechanism of Universal Dividing Head|
Advantages of Universal Indexing Head
The universal indexing head or universal dividing head is used to perform the following operations :
- To set the workpiece in the desired position, in relation to the machine table.
- To rotate the workpiece through the desired angle, after each cut and hence, index the periphery of the workpiece.
- To provide continuous rotary motion to the workpiece while milling of helical grooves.
Optical Dividing Head
The optical dividing head is the most precise dividing head. An optical dividing head is used for the measurements and inspection of precision angles, measurements, and dimensions.
The angular dimensions can be read up to seconds of a degree with the help of optical lenses set in the head.