4. Both rivet hammer and bucking bar are mounted on two
traveling tracks. They are connected to a double-acting air
cylinder and pressed against each other on the rivet across a
panel. With this test fixture, the duration of the operation can be
extended to last the entire time block, for example 0.5 s or longer.
Leakage error will be largely reduced and the repeatability of the
test data can be significantly improved. This test fixture is very
suitable for design modification purposes.