• The conventional manufacturing process for armament shell chambers is reaming with a profiled reamer.
• Our expanding chamber roller burnishing tools enhance the reamed bore by producing an extremely fine surface finish (15 micro inches or less), which produces improved performance, repeatable shell ejection and preventing jams.
• Due to the fact that no metal is removed in the process, the surface finish depends on the existence of a uniform and tear-free reamed finish which will be caused to flow under the force exerted through the rolls.
• Our standard CBT are available from stock with many other chamber configurations available upon request.

CBT Tool Operation:

1. The expanding chamber roller burnishing tool applies a steady rolling force of approximately 400lbs per 1/16 inch of roll length to the surface of the chamber.
2. Applying this rolling force is acheived through the use of hardened tapered rollers that are held in place by a cage and rotate around an inversely tapered mandrel.
3. The tool locates in the bore of the chamber and the bearing mounted stop thrusts off the front of the component to expand the rollers, which exerts burnishing force onto the surface of the chamber, resulting in a smooth surface finish in one pass.
4.  The rollers collapse automatically when the tool is retracted to prevent damage to the bore.
5. The tool is equipped with an overtravel mechanism to ensure guaranteed repeatability and control the rolling force upon the chamber surface.