Rotating Bending Fatigue Testing Machine@[Japan]
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Technical information


Dual-spindle rotating bending fatigue testing machine

Model : YRB200L
GIGA QUAD series YRB200L


High Efficiency
GIGA QUAD is convenient to get a number of fatigue test data very quickly, because four specimens can be tested simultaneously.
In order to obtain one S-N curve, four specimens can be tested at different stress levels by giving different weights for the respective specimens. Thus, S-N property of a definite material can be obtained within the reasonable short period.
From this point of view, the present machine of GIGA QUAD has a significant performance of the high efficiency.
Easy operation
In this testing machine, collet nuts and collet chucks are used to fix and remove the specimens.
When the user wants to fix a specimen, the specimen is inserted into the collet chuck as indicated in this figure, and he tightens the collet nut by using a spanner.
And when he wants to remove the specimen, he loosens the collet nut by the spanner, and pull out it by fingers.

About the collet chucks, different inner diameters such as 6mm, 8mm and 10mm are prepared in advance.
Thus, the user can choose the most convenient size of the collet chuck depending on their own requirements.
How to fix , How to remove
Small eccentricity
The advantage is to use high performance collet chuck and nut. Thus, small eccentricity of the specimen after chucking was realized.
Such a small eccentricity is fundamentally important to perform the fatigue tests in rotating bending.
If the eccentricity becomes large, problems of vibration and noise take place in the fatigue tests and, therefore, some extent of error is included in the applied stress.
According to preliminary experiments, no effect of the eccentricity was found for fatigue test data to obtain the S-N property, if the eccentricity is kept within }30m.
This is the reason why eccentricity is focused as an important subject as a ROTATING BENDING FATIGUE TESTING MACHINE.
From this point of view, the eccentricity was kept within }10m.
One handed type
Plating, heat treatment, thermal spray, shot peening, laser, coatingc.
GIGA QUAD is suitable for any kind of research and studies for metal fatigue characteristics with surface modification.
Because the effective volume of the specimen in the cantilever bending(One-handed type) is much smaller than that in the uniform bending(both-handed type).
This means that it is small percentage that the specimen is broken by material inner defect in the case of one-handed type.
High weight type
YRB200L is a higher weight model adapted for metal fatigue strength characteristics with high intensity and with heat treatment. It is designed with safety for higher weight.
YRB200L can be loaded to 80kg per one specimen.
Specification (for Japan)

YRB200L : the type of higher weight and underneath motor
Spindle  spindle number    2
spindle speed  PRM 3150
motor  KW 0.4kW-4P
Capacitance   V 200
Bearing  spindle   Angular contact ball bearing
specimen   Deep groove ball bearing
Collet chuck chuck size mm 2.5-20
Maximum load   kgf 80X4
Belt type     V belt A
Size of device  weight kgf about 170
size  mm 800X660X1100
Adjust boad of standard type     -
Service life   year 3
Guaranteed term   year 1

It is possible to change the specification for the other country.

Product specifications and appearance may be changed for the improvement. We appriciate your understanding.
Name Quantity Outline
Adapter 4 holding parts of weight
choice from 2.5-20mm
Speed adjusting unit 1 Spindle can be adjusted from 1000 to 4000prm.
Weight 16 about 5kg
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Rotating Bending Fatigue Testing Machine@[Japan]

4-7, Setoguchi 2-chome, Hirano-ku, 547-0034 Osaka Japan
TEL: 81-6-6704-1800@E-mail:

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