Looseness Meter Model 6105 is a measuring instrument specially
developed for the purpose of measuring quantitatively the degree
of looseness of a rotating bar of a large scale motor while its
being subjected to a temporary maintenance in factories or plants.
Judgment is made by observing amount of responding vibratory acceleration
against the shock pulse applied.
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Features:
- A degree of the looseness of a tightened body can
be got quantitatively in high a0ccuracy.
- Small and handy. Excellent mobility throughout actual
spots.
- Judgment is made by both lamp and buzzer. The judgment
can be conducted instantaneously from one object to
another without seeing the displayed valued visually.
- Because
the starting button is mounted on the pulse hammer,
an immediate and simple starting can be made.
- A specially designed printer is prepared and is supplied
optionally, for the recording of data measured.
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RESPONDING VIBRATORY ACCELERATION:
When a knock is made to a tightened portion where a looseness might
no doubt take place, a resonant vibration generates at that knocked
portion. Such resonant vibration is changing in proportion with
the degree of looseness as per Figures 3, 4 and 5.
On the other hand, a responding signal is also changing in proportion
with hammering strength. In order to eliminate unnecessary effects
to be brought about from the hammering strength, the conversion
is made to produce the responding signal exactly corresponding to
the unit strength of the hammering. After that, the final value
got as a result of averaging 6 actually measures values is processed
on a built-in microcomputer for the display on the digital display
window and for the lighting of one of the 3 signal lamps.
The larger the amount of looseness, the larger
the amount of responding signal against the same hammering strength.
The amount of looseness is represented by the following formula:
Amount of looseness per unit strength(L)
= Amount of responding vibration / Amount of hammering.
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Fig. 6 shows the change in the looseness of the rotating bar of
the motor during the period of 15 years. The judgment was made on
the following three criteria of the looseness:
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ACCEPTABLE: |
Lower than 0.3 |
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CAUTIOUS: |
Between 0.3 to 1.0 |
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NON ACCEPTABLE: |
Larger than 1.0 |
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Measurement of the looseness
of the bar of the motor. |
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Hammering Direction |
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SYSTEM COMPOSITIONS:
Main System of Looseness Meter, Model-6105 |
1 set |
Acceleration Detector, Model-2304A |
1 ea. |
Contact Pin for the above |
1 ea. |
Low-Noise Cable, Model LNC-1A-3 for the
above |
1 ea. |
Pulse Hammer, Model-2340 |
1 ea. |
Cable for the above, 3m long. |
1 ea. |
Dry Battery, UM-1 |
1 ea. |
Operation Manual |
1 ea. |
Power Unit with Printer |
1 ea. |
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DIMENSIONS AND WEIGHT:
Main System |
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202W x 120H x 235D mm, approx. 3Kg. |
Acceleration Detector |
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14mm dia. x 119 mm L (complete with Pin),
approx. 630g. |
Pulse Hammer |
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110H x 160L (Length of the Handle), approx. 155g. |
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POWER UNIT complete with PRINTER:
Dimension |
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154W x 64H x 159D mm |
Weight |
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approx. 900g. |
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Machine that can connect
to personal computer:
Loose Meter, Model-6105A |
Connectable to personal computer via RS-232C interface. |
Data acquisition software (for use with WINDOWS) provided. |
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