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What
is the difference between a Multi-Media Abraser Attachment and the
Multi-Media Abraser?
If
you already own a Taber Abraser, only the Multi-Media Abraser
Attachment is required to conduct particle abrasivity testing.
A Multi-Media Abraser is the term referred to as the complete
instrument.
My specimen material is a fluid and has particulate matter in
it. Can I use the tester?
Shake
or stir the fluid so it is uniform in consistency. Examine the
fluid after 3 ½ minutes; if the particles separated from
the fluid you must alter the test parameters to accommodate the
separation. (The centrifugal effects may result in diminishing
wear rates as the number of cycles increase due to outward particle
migration).
To simulate actual wear conditions, can I prepare my own pins or
disc?
Included
with each instrument is a template that provides the necessary
dimensions for preparing custom pin and wear disc. This is useful
for duplicating actual wear conditions that occur in a manufacturing
process.
What is the usable life of the pins?
The
pins may be used until 25% of the initial weight is removed. At
this point, the pins should be replaced.
What is the usable life of a wear disc?
The
wear disc does have a usable life. Taber recommends conducting
only 2 - 3 tests per side, before discarding.
Is the plastic dish cover required when testing?
It
is not a requirement, but the cover prevents test material from
evaporating and helps reduce the risk of spills.
What is the speed of the specimen dish.
Depending
on your input power, the RPM of the specimen dish will vary. At
115V/60Hz the specimen dish will rotate at 72 rpm. At 230V/50Hz,
the dish will rotate at 60rpm.
What gear should I use?
The
more abrasive or viscous, or larger the particulate size a media
presents, the more resistance it adds to the system. Therefore,
a lower / slower drive ratio speed should be used.
- Orange
- Used to create a base line. Used to test most materials.
- Yellow
- 23% increase in speed. Reduce total number of cycles , reduce
the "fluid wave" in front of the rotating pin holder,
level-off the media as it is passed by the pin holder
- Red
- 0.6:1 is slowest speed. As specimen loading increases to 1750g
or greater, necessary to run this speed to supply adequate torque
to rotate the pin holder to maintain a constant speed.
- Green
- 290% increase in speed, use when low percent by volume particulate
concentration and rate of wear may be insignificant over an
extended number of cycles, low sample loading.
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