place the two ends of the shank into the fixture and fixed,then give a certain force make the shank bending reciprocally at 4 cycles per minute after reaching the specified test number check its damage degree.

The principle is the core of both ends with two sets of clamps fixed, and subjected to a certain amount of force applied to the fixture at the core frequency per second, fourcycle reciprocating bending movement, view the sample after a certain number of the extent of the damage.

Technical data:
test speed: 0-300cpm
imposed in the sample loop force: 5±0.2KG
the distance between the fixture: 7±0.1cm
counter: Six figure LCD 0-999 999
valume: 50*30*40cm
weight: 90kg
power: AC220V 0.4KIW 50hz( can be according to your country design )
model: HY-748 Shoe Steel Shank Fatigue Resistant Test Device