Gage for Measuring the Intensity of Shot-Blast Peening

Author:  Jack M. Champaigne
Source:  US Patent 5,297,418
Doc ID:  1994017
Year of Publication:  1994
Abstract:  
An Almen type gage with an improved test strip support mechanism, which concentrates the holding force at the contact points. The support mechanism includes four paired contact balls and a permanent magnet engaged between the paired balls to magnetically hold the test strip against the contact balls. Each contact seated atop a set screw turned into a test platform with the magnetic flux of the ermanent magnets passing through both the contact balls and the set screws.