Oncentres

Oncentres refers to a type of woodworking tool used in conjunction with a lathe. Specifically, it is a chuck designed to hold a workpiece for turning on its center, as opposed to holding it by its outer diameter. This method is particularly useful for tasks such as turning bowls, platters, or other hollow forms. The oncentre chuck typically works by gripping the internal surface of the workpiece, often a pre-drilled hole, or by expanding within a recess. This allows the external surface of the workpiece to be fully exposed for turning. There are various designs of oncentre chucks, including those that use expanding jaws, expanding pins, or screw-mounted adapters. The choice of oncentre chuck often depends on the size and shape of the workpiece, as well as the specific turning operation being performed. Proper selection and secure mounting of the workpiece are crucial for safety and successful turning. Oncentre chucks are a common accessory for woodturners working with natural edge bowls or items where preserving the original shape of the wood is desired.