Different turning processes require different lathe speeds.For instance, turning a chair leg will require a higher speed than turning a cereal bowl.
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Below is a rough guide to show certain speeds that should be used for certain sizes of timber:
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Some lathes are equiped with 'variable speed' switches whose speed can be adjusted using a switch. However most lathes use a simple belt and pulley system to change the speed. These will be located in the lathe's headstock.

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CAUSTION! Changing lathe speed should always be supervised by the teacher
Below is a short video on safely changing the lathe speed:
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