- This is a vial of small bearing needles collected by the Anti-Friction Bearing Manufacturers Association for a public relations exhibit during the early 1950s that was donated to the museum in 1977. For optimum bearing performance, needles in a bearing must be exactly uniform size. If not, the bearing’s load will focus on the irregular needle, leading to failure in the bearing. During the middle of the 20th century, needles were manufactured by the “cold heading” process. In cold heading a piece of cylindrical steel wire is cut and formed into a needle shape by a die. This forms rough needles with protrusions that are ground away by a process called deflashing. Further heating, grinding, lapping, and cleaning leaves uniform needles ready to be added to its matching cage or raceway to make a fully assembled bearing.
- Simple bearings have been used for thousands of years reducing friction on turning parts like the axles of carts. In the late 1800s and early 1900s advances in machining and production expanded bearing use in all types of machines greatly increasing their life and precision. Bearings reduce friction on turning surfaces and keep them running true. Bearings come in a variety of shapes and sizes (including ball, roller, tapered, and simple friction). Modern bearings are often set in an inner and outer ring (called a race) sometimes with cages (separators) spacing the bearings. Changes to the size, shape, alignment, race, and cage allow for bearings to be used in almost any industry—from industrial turbines and automobiles to household mixers and computer hard drives.
- Currently not on view
- Object Name
- Bearing Needles, Set of
- Physical Description
- glass (bottle material)
- overall: 2 3/4 in x 3/4 in; 6.985 cm x 1.905 cm
- ID Number
- catalog number
- accession number
- See more items in
- Work and Industry: Mechanical and Civil Engineering
- Industry & Manufacturing
- Data Source
- National Museum of American History
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