An ER ball bearing nut is a variation of the standard ER nut that uses ball bearings to provide a more secure grip on the tool shank. Instead of relying solely on the friction between the nut and collet to hold the tool in place, the ball bearings apply pressure around the circumference of the tool, ensuring a more uniform grip and reducing the risk of slippage or vibration.
The ball bearings are housed in grooves inside the nut, which allows them to move freely as the nut is tightened or loosened. As the nut tightens onto the collet, the ball bearings are forced outward against the tool shank, creating a firm grip. When loosening the nut, the ball bearings retract back into their grooves, allowing the tool to be easily removed.
ER ball bearing nuts are particularly useful for high-speed, high-precision machining applications where tool slippage can result in poor surface finish or damaged parts. They are available in the same sizes as standard ER nuts and are compatible with the same range of ER collets. However, they tend to be more expensive due to the added complexity of their design.
An ER nut is a type of collet nut used in conjunction with ER collets in milling, drilling, and turning operations. ER stands for "extended range," as these collets are capable of holding a wide range of tool diameters.
The ER nut screws onto the end of the collet and secures the cutting tool in place. It features internal threads that mate with the external threads on the collet, allowing for a secure grip on the tool. The nut typically has slots or holes on the outside surface for use with a hook spanner wrench to tighten or loosen it.
ER nuts come in various sizes to match the corresponding ER collet size, such as ER16, ER20, ER32, and so on. They are usually made of hardened steel for durability and long life.
Overall, ER nuts are essential components in machining operations that use ER collets, providing a secure and reliable method of clamping cutting tools in place.
