Product Details
The TABER® Multi-Media Abraser provides a reproducible method to
measure the relative abrasiveness of most fluids, powders, pastes
and semi-solids. Used in conjunction with the Taber Rotary
Abraser, the Multi-Media Abraser is valuable to characterize how
these mediums cause wear when they come in contact with different
components.
The sliding wear concept utilized in the Multi-Media Abraser was
first utilized to evaluate different types of adhesive and
sealant formulations. The amount of wear observed in laboratory
tests correlated well with the amount of wear that different
adhesive formulations caused on moving parts in pumps and other
application equipment in an automotive manufacturing
setting.
Description
The medium to be tested is placed in a specimen dish that
includes a replaceable stainless steel wear disc on the bottom.
As the dish rotates, an integral drive shaft operates a set of
gears which turn the spline shaft. At the base of the shaft is a
pin holder with three (3) replaceable hi-grade brass pins that
rotate in the opposite direction of the specimen dish. As the
test medium flows between the brass pins and stainless steel wear
disc, the material acts as an abrasive and causes wear.
To test a wide range of material viscosities, both load and pin
holder speeds are adjustable. The standard testing load on the
brass pins can be varied from 250g to 1,000g (in 250g increments
with the supplied weight discs). Optional weight discs can bring
the maximum load to 2,500g.
The rotational speed of the specimen dish is dependent on the
model Taber Abraser that is being used. By changing the gearing,
the rotational speed of the pin holder can be altered as noted in
the table below. 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. The optional gearing provides a greater range of testing
speeds and is recommended for specimen loadings greater than
1,750g or where there is a low percent by volume particulate
concentration in the medium.
For simplicity, gearing is color coded.
-
Orange
- Used to test most materials.
-
Yellow
- Results in 23% increase in speed. Recommended to reduce the
total number of test 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
- This optional gear provides a 0.6:1 ratio and is the slowest
available speed. As the specimen loading increases to 1750g or
greater, it may be necessary to run at a slower speed to supply
adequate torque to rotate the pin holder and maintain a
constant speed.
-
Green
- This optional gear provides a 290% increase in speed compared
to the standard gear set-up. Recommended when there is a low
percent by volume particulate concentration; low sample
loading; and when the rate of wear may be insignificant over an
extended number of cycles.
Color
Code
|
Gear
Set-Up
|
Drive : Driven
Ratio
|
Pin Holder
RPM(Abraser turntable speed = 72
rpm)
|
Pin Holder
RPM(Abraser turntable speed = 60
rpm)
|
Orange
|
Standard
|
0.9 : 1
|
65
|
54
|
Yellow
|
Reversed
|
0.6 : 0.9
|
80
|
67
|
Red
(optional)
|
Standard
|
0.6 : 1
|
42
|
35
|
Green
(optional)
|
Reversed
|
1 : 1.7
|
123
|
103
|
Using the template provided in the operating instructions, custom
pins or wear discs can be fabricated. Utilizing custom pins or
discs made of the materials from your specific application will
help you to understand the wear characteristics.
The Taber Multi-Media Abraser is available as a separate
attachment (Model 5000) or pre-mounted on a single or dual Taber
Abraser.