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1700/1750 - Abrasive grain feeder attachment 355
1700/1750 - Abrasive grain feeder attachment 355
The Taber Grit Feeder Attachment 355 (abrasive grit feeder attachment) is used in conjunction with the Taber Rotary Platform Abraser (Abrader) 1700/1750 is used to evaluate the three-body abrasion caused by the destructive effect of fine, hard particles. Originally used as Frick-Taber test this instrument was used to determine the wear resistance of floor coverings with smooth surfaces.
Required accessories relevant ...
The Grit Feeder is a free-standing instrument that has a Taber Rotary Platform Abraser 1700/1750 (not included in the scope of delivery) is required to carry out the tests. The grit distribution nozzle is positioned above the sample of the Taber Abraser in front of the right-hand grinding wheel. During the test, abrasive grains are applied evenly and continuously to the sample surface. As the sample holder rotates, the loose abrasive particles run under a pair of S-39 Leather-Clad Wheels through. The resulting rolling movement of the particles acts as an abrasive and contributes to the physical decomposition of the material. After the sand particles have passed under both wheels, they are removed by a vacuum system together with the abrasion particles produced during the test.
The operation of the grain feed is controlled via the Taber Abraser, so that the rotary disc, the grain distribution and the suction are operated simultaneously.
IMPORTANT: Due to the type and quantity of abrasives used in this test, Taber recommends that the vacuum filter and collection bag are checked regularly and replaced as necessary.
Depending on the Taber Abraser model you own, three grain feed models are available.
Grit Feeder- Model 355 is specially designed for use with the Taber Abraser model 1700 or 1750. It provides an easy-to-fill hopper with a capacity of approximately 2,650 grams. The Model 355 hopper assembly mounts on either the left or right side of the Taber Abraser and swivels to allow the operator easy access for viewing or mounting the test sample. The grain feed attachment is controlled and operated via the touchpad of the 1700 or 1750 model and the supplied USB interface cable. A curved suction nozzle on the front, specifically designed for use with the Model 1700 and 1750, is used to remove spent sand and debris.
Grit Feeder - Model 155 can be used with older versions of the Taber Abraser and offers a hopper capacity of approximately 1,300 grams. The 155 model is mounted on the left-hand side of the Taber Abraser and has a guide screw that can be used to adjust the position of the device. The height of the grain distributor and the suction nozzle is adjusted with a knurled screw.
The Grit Feeder Model 255 can be used with older versions of the Taber Abraser and offers a hopper capacity of approx. 4,500 grams. An alignment block is integrated into the base of the Model 255 to ensure correct positioning of the grain feeder in relation to the abraser. A hand crank controls the telescopic function, which enables precise height adjustment and the testing of thicker samples (up to 40 mm with the Taber Abraser Arm Height Extension Kit). The ability to mount on the right or left side allows two instruments to be used in conjunction with the Taber Abraser with double rotating platform.
Note: A Grit Feeder Control Box (sold separately) is required to use older versions of the Taber Grit Feeder with Taber Abraser Model 5135 or 5155 equipped with the Grit Feeder Control Output port.
Abrasive
The standardised abrasive that is supplied with the Taber Grit Feeder is a #240 Aluminium oxide grain (model S-41). This aluminium oxide, manufactured specifically for Taber Industries, has tighter controls for particle size analysis and bulk density characteristics compared to "off the shelf" aluminium oxide. S-38 standardisation plates are used to calibrate the flow rate and measure the removal rate of the abrasive.
Before use, the Abrasive grit The grit is sieved through the US standard sieve No. 80 to break up any conglomerates and remove oversized or foreign particles. The abrasive grit is then dried for 1 hour at approximately 82° C (180° F). Allow to cool in a room with controlled temperature and humidity before use.
In order to fulfil the EN 14354 and ISO 24338 method B test method, the Aluminium oxide grain Alodur ESK 240 can be used. Contact Taber Industries for more information.
Evaluation
The following methods are commonly used to analyse grit feeder test results:
Weight loss (mass) - The weight loss test method is a quantifiable method that records the weight loss of your test sample due to abrasion. This method of analysing test results is recommended when comparing results to similar materials with nearly the same specific gravity. Weigh your test sample before and after the test to determine the initial and final weight. The difference between these two values, Ftotal, is the weight loss.
Ftotal = A - B
where A = weight (mass) of the sample before abrasion, mg
B = Weight (mass) of the test specimen after abrasion, mg
Use the following formula to calculate the average mass loss Fm in milligrams (mg) per 100 cycles:
Fm = (Ftotal / n) x 100
where n = total number of revolutions
When performing the weight loss method, loose particles may adhere to the samples during the test. It is important that you clean the test specimens as well as possible before weighing.
The Taber wear index can also be used to visualise weight loss data. This measure is the weight loss in milligrams per thousand abrasion cycles. The lower the wear index, the better the abrasion resistance of the material.
- Taber wear index = (Ftotal x 1000) / n
Cycles up to a certain end point - The number of cycles required to reach a specified end point (e.g. wear to substrate). Alternatively, this could be expressed as the state of the specimen after a specified number of cycles.
In accordance with test method EN 14254 (Wood-based panels - Wood veneer floor coverings - Annex D - Test method for the determination of wear resistance), the wear produced by the Taber Grit Feeder is assessed using a transparent template, with each quadrant divided into four sectors of 22.5°. The transparent template is placed on the test piece to determine if there is continuous wear in 12 of 16 sectors and continuous grit in one sector per quadrant. If the contrast between the substrate and the coating is insufficient, a contrast marking solution can be used (e.g. an aqueous solution of 1% methylene blue or alkali blue).
Volume loss method - When comparing the wear resistance of materials with different specific gravities, a correction for the specific gravity of each material should be applied to the weight loss to give a true measure of comparative wear resistance. The application of this correction factor results in a wear index that relates to the volume loss of the material to which it is applied.
Determine the specific gravity of the material to be tested in accordance with standard practice. If the sample is not homogeneous but has a surface that is different from the body or core, determine only the specific gravity of the surface. If the abrasion extends beyond the surface of the body, the specific gravity of the body shall also be determined and the abrasion resistance of the two components shall be calculated and reported separately.
Volume loss, cm3 = (W1 - W2) / S
where W1 - weight of the test specimen before abrasion, g
W2 = Weight of the test specimen after abrasion, g
S = specific weight
Abrasion depth method (thickness) - Certain test requirements may require the abrasion depth to be measured. To determine this, mark four points on the back of an unabraded specimen 90° apart and at a distance of 38 mm (11/2″) from the centre hole [this is within the wear path]. Measure the sample thickness with a thickness gauge or micrometer. After grinding down the sample, repeat the measurements and note the difference. To compensate for differences in depth around the wear path of the sample, an average value should be calculated from the four measured values.
The change in thickness can also be measured using an optical micrometer or similar instrument. Position the gauge so that it covers both the abraded and unabraded portions of the sample. Calculate the wear by measuring the difference between the abraded and unabraded areas at four equally spaced points around the sample and average the results.
Alternatively, the average thickness loss can be calculated by dividing the volume loss by the abraded area of the sample.
Additional information
| brand | Taber |
|---|---|
| Standards | ASTM F510, EN 13696, EN 14354, EN 15468, EN 655, EN 660-2, IKEA Spec. No. IOS-TM-0002, ISO 24338 |
