A bar feeder is a machine that automatically feeds long, straight bars of material into a machine tool, such as a lathe or a mill. The bar feeder is typically located in front of the machine tool and is connected to it by a mechanical or pneumatic interface. It is used to eliminate the need for the operator to manually load the material into the machine tool.

The bar feeder works by gripping the end of a bar of material, typically held in a magazine or a storage rack, and feeding it into the machine tool at a controlled rate. It can also be used to change the bar when it is finished by an automatic mechanism.

The bar feeder is usually adjusted to match the size and type of bar stock that is being used, and can be adjusted to feed the material at a specific rate, to match the speed of the machine tool. They can also be programmed to stop feeding the material when a certain point is reached in the cutting process, such as when a hole is drilled to the correct depth.

Bar feeders can be used with a variety of machine tools such as lathes, milling machines, and Swiss-type lathes. They are particularly useful in high-volume production environments, where it can be very time-consuming for an operator to manually load the machine tool with material.

Overall, bar feeder machines are machines that automate the process of loading long, straight bars of material into