Model 1700 / 1750 Rotary Platform Abraser
13
Operating Instructions ver. 1.0
p/n 135505
NOTE:
A gap of 3 mm has been found to be effective on
most materials.
NOTE:
To facilitate setting the nozzle gap, a shim may
be inserted between the vacuum nozzle and specimen.
Take care not to damage the specimen surface.
Vacuum Level
– The vacuum suction level should
be set high enough to remove debris from the
specimen surface, but not lift flexible samples. A
visual inspection of the wear path can usually
indicate if debris is adhering to the specimen
surface and the vacuum level (or vacuum nozzle
height) needs to be adjusted. For test control and
standardization of vacuum suction, the vacuum
level is calibrated to values of 50
– 100%.
NOTE:
The amount of vacuum suction is influenced by
the type of material being tested and height of the nozzle
above the specimen surface.
Vacuum Nozzle Inserts
– The Model 1700 / 1750
includes replaceable vacuum nozzle inserts (front
nozzle is short, rear nozzle is long). The nominal 8
mm are standard for most tests. The optional 11
mm nozzle inserts are typically required for
materials that are evaluated using a change in haze
(e.g. ASTM D1044).
REFACING WHEELS
Taber abrasive wheels possess properties that
cause the working faces to disintegrate slowly as
they are used, continually exposing fresh abrasive
grains to the specimen being tested. However,
depending on the material being evaluated, debris
from the test specimen may clog or adhere to the
wheel surface. If this occurs, the wheels must be
cleaned (refaced) at regularly defined intervals. Do
not confuse coloring of the wheels with “clogging”
as this may simply be due to the wheel faces
becoming coated with fine abrading dust, a
condition that must be expected.
It is good practice to standardize the abradant prior
to each test. Failure to reface the wheel surfaces,
may introduce variation into the test results.
NOTE:
Wear life of Taber abrasive wheels varies
depending on test load, and the surface texture / frictional
characteristics of the material being tested. Under
ordinary conditions, a wheel set should last from 10,000
to 50,000 wear cycles. Abnormally short wheel life may
indicate the use of the wrong wheel, load, or procedure for
the material tested, or too frequent refacing.
NOTE:
Wheels can be used until they are worn down to
their minimum diameter of 44.4 mm as indicated by the
wheel label.
Refacing Resilient Wheels (Calibrase)
The S-11 Refacing Disc are used to resurface all
Calibrase wheels with the exception of CS-10F
when they are used for evaluating change in haze
for transparent materials. In this case, CS-10F
wheels are refaced using the ST-11 Refacing
Stone.
1. Mount the wheels to the abraser.
2. Mount an S-11 Refacing Disc (or ST-11
Refacing Stone) on the SH-125 specimen
holder. Use the clamp plate and nut, and hold-
down ring to secure the S-11. The clamp plate
and clamp ring are not required for the ST-11
refacing stone.
3. Mount the auxiliary weights for the load that will
be used for testing.
4. Lower the abrading wheels onto the refacing
medium.
5. Adjust the vacuum pick-up nozzle height to
within 3
– 6 mm of the refacing disc. See note
on page 14 for CS-10F wheels.
6. Program the appropriate number of cycles
according to Table 1 (or as specified) and
subject the wheels to refacing.
