• In-House ballizing production as a sub-contractor
  • In-House ballizing production as a general contractor
  • Contract ballizing research and development
  • Ballizing machines, standard and custom design
  • Tooling design and construction
  • Sales and leasing of new and used Ball-O-Matic machines
  • Sales of standard and custom designed Tungsten Carbide Balls (many available for shipment on an immediate red tag basis)
  • Tungsten Carbide ball and water reconditioning
  • Sales of special lubricants, tooling, ballizing, and swaging supplies
  • Swaging research, product development, and production

National Ball-O-Matic

850 Mandoline
Madison Heights, MI 48071
(248) 583-1338
Fax (248) 583-3194

The Basics

Ballizing offers low cost with high productivity. You'll get superior performance from finely finished abrasion-free parts that will have a longer life and a lower percentage of scrap than those produced with comparable operations. It really does outperform honing, grinding, boring, reaming, and other similar methods in achieving close tolerance IDs.

Ball-O-Matic ballizing is the forcing of a precision ground hardened tungsten carbide ball of a prescribed diameter through a slightly undersized hole. Our tungsten carbide balls have been found to be close to perfect roundness. That's one reason we say we're pushing perfection. Another, of course, is the superior fibishes achieved by the process.

As the ball passes through the part, it does not remove metal, but compresses it into a denser layer as it refines the surface. So at the same time that it's bringing the hole to the required size, it eliminates tool marks and other surface imperfections. No scratches, scores, or drag marks remain. You get a desirable work-hardening as the ball hot-works the metal. This improves wear resistance. The part's durability is actually metallurgically improved. This is especially important if the hole is to be exposed to friction or bearing stress.

Pre-ballized holes can have tolerances double that of the print tolerance and required micro-finish roughness. Final tolerance and micro-finish can then be obtained with ONE pass of the ball.

High Production

Production rate depends on part configuration, hole length, ball speed, and operator efforts. Flat gear blanks can be ballized at 5,000 per hour. One side benefit of ballizing is that when sizing or finishing main bores, cross holes, and/or undercuts in the part are also deburred. Depending on wall thickness, taper, and out-of-round conditions can be corrected up to 50%.