Mandrel
Mandrels are used for holding and rotating a hollow work piece that has been previously drilled or bored.
The mandrel is fitted with a taper fit inside the hollow work piece and turned either between centres or by holding in a chuck.
Different types of mandrel in use are:
1. Plain mandrel
This mandrel has a plain single diameter with slight taper and is suited to hold only a particular diameter hole.
Different mandrels are used for every different size of holes
2. Step mandrel
As it has several steps different work pieces having different size of holes can be hold without replacing the mandrel each time
3. Collar mandrel
This type of mandrel is used for holding work pieces having holes of large diameter. This design not only reduces its weight but fits better than a solid mandrel also.
4.Screwed mandrel
It is threaded at its one end with a collar to hold work pieces having internal thread
5. Cone mandrel
This type of mandrel is suitable for holding work piece having hole diameters by placing the work piece on two cones and tightening the nut
6. Gang mandrel
This type mandrel is used to hold a number of hollow workpiece and tight by a nut. Considerable time is saved by using this mandrel in mass production work.
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