Apparatus
10.1 Testing Machine—Any fixed-head testing machine
conforming to Practices E 4 and to the requirements for speed
of testing prescribed in 12.3 may be used. A spherical head
must not be used.
10.2 Bearing Plates—Hardened steel 60 HRC bearing
plates shall be used between the contact cylinders and the
platens of the machine. These plates shall be approximately 2.5
in. (63.5 mm) in diameter by 1 in. (25.4 mm) thick. The contact
faces shall be surface ground until flat and parallel within 0.001
in. (0.025 mm) total indicator reading. The bearing plates shall
be resurfaced as necessary to retain their tolerance and to
remove any surface damage resulting from testing high-