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Home  >>  Products  >>  Abrasion  >>  Washability Accessories
Washability Equipment Accessories

Washability Equipment Accessories

  (Illustrated Above) (Not Illustrated)
 
  1. Test Sample Tray
  2. Brush Box with Low Center of Gravity
  3. Sponge Box shown with Sponge (not included)
  4. Brush Box
  5. Lilly Frame
  6. Additional Weight
  7. Additional Weight
  8. Abrasion Boat
  • Friction Box & Sled
  • Hardness Measuring Boat
  • Stroke Length Limiter
  • Force Checking Assembly
  • Automatic Film Applicator

 

Standard Optional Accessories - See Price List

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Item Number Item
For Models D10, D7V, D8V, D9V, 10V, D7VF, D8VF, D9VF,10VF, D5.5VFI, D7VFI, D8VFI, D9VFI, D10VFI & Pneumatic (VP)
WA-2205 Test Sample Tray 18" (Standard)
WA-2230 "Lilly" Frame 17.75" (Standard)
WA-2235 Glass Plate 17.75" (Standard)
For Models D16, D12V, D16V, D12VF, D16VF, D12VFI & D16VFI
WA-2207 Test Sample Tray 24" (Long)
WA-2233 "Lilly" Frame 23.75" (Long)
WA-2237 Glass Plate 23.75" (Long)
For Models D12V & D12VFI Only
WA-2195 Extended Drive Fork (For use with cutout base)

 

Test Sample Tray

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WA-2205 (Standard) • WA-2207 (Long) - All testing that involves a liquid is conducted in a specially designed tray. A laboratory ring stand with 3" ring supporting a 1000 ml separatory funnel is suggested for metering liquid as may be required. There are two lengths of trays. The 18" length is for use with the 5.5", 7", 8", 9" & 10"Models. The 24" tray is for use with the 12" & 16" models. All models may be used without the tray when there is no need for liquid containment. When the pan is not used, any length test specimen, exceeding stroke length plus five inches, may be clamped directly onto the machine base or with a glass plate between the base and the test specimen (Models D5.5, D7, D8 & D9 are exceptions). Glass plates, cut to fit the trays, are available as separate items.
 
The tray is fabricated from 1/16" thick stainless steel and is fitted with four 3/16" long round feet secured to the lower surface which are spaced to straddle the base plate of the tester. The tray is also fitted with a drain with stopper closure. This design serves not only to position the tray on the base, but also permits the use of “C” clamps to secure the test specimen in the most advantageous position. The clamps may be used at any location along either end of the tray or along the outside edge. Two such clamps are furnished with each tray. Test Sample Tray

 

Lilly Frame

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WA-2230 (Standard) • WA-2233 (Long) - The Lilly frame is designed to be used with the test sample tray. There are two lengths, one for the 18" tray, and one for the 24" tray. When clamped in place in the tray, the frame serves to isolate a portion of the test surface to a liquid used in the test. It also serves to hold flexible materials in place against either the tray, glass plate or the machine base. Note that the sponge box cannot be used with the Lilly frame because of its width. Only one brush box or abrasion boat is accommodated. The Lilly frame has an overall length of either 17.75" or 23.75". The overall width is 3.88" with an inside width of 2.375". The frame is machined from 1/4" thick aluminum and is fitted in a groove in the lower surface with a flexible gasket. Two 1 inch “C” clamps are furnished with each test sample tray and may be used to secure the Lilly frame against the test surface.
 
Lilly Frame

 

Brush Box

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WA-2210 • WA-2211- The WA-2211 brush box is the same weight as the WA-2210 but it offers a lower profile and center of gravity. The brush box serves to secure and weight a specified brush for use in the test equipment. It may be used with any of the Gardco models. Up to three brush boxes may be carried by the machine drive fork at any one time for multiple sample testing. The brush box is designed with adequate clearance to accept a brush base 3.5" long and 1.5" wide and is fitted with adjustable anchor bolts. Normal brush base thickness is 0.5" with 3/4" bristle extension. The brush box is fabricated from 1/16" stainless steel and is fitted with two set screws in one end. This design permits side to side centering of the brush in the box and insures uniform brush loading. The brush box has a weight of 16 ozs. including the removable weight shim and a PVC base brush. 2211WA-2211
 
Brush Box
  The diagram above is only for the WA-2210 WA-2210

 

Specification Brushes

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WA-2272 • WA-2274 • WA-2276 • WA-2278 - These specification brushes are available either in black nylon or black hog bristles and in a 5x4 wide staggered 13 row or 5 wide straight 12 row pattern. (ASTM D2486 calls for nylon 5x4x13 rows.) The new Gardco brush bristles are secured in a PVC block 3.5" long, 1.5" wide and 0.5" thick.

The bristles are uniformly trimmed to a length of 0.75". Nylon bristles are 6/6 grade, 0.012" in diameter with a bristle weight in each brush of 5/8 ± 10% ounces. Hog bristles are selected as nearly as possible to be equivalent to the specified nylon. Total brush weight is 2.5 ounces which is 1.5 ounces lighter than current metal-backed brushes. To compensate for this difference a 1/16 inch thick stainless steel plate is furnished with each new brush that may be inserted in the brush box above the brush. After a long period of use bristles will wear down below the original length of 3/4". Brush bristles should be periodically measured and if they reach a shortened length of 5/8", we suggest they be disposed of. The shorter the bristle, the firmer it is. The firmer the bristle, the more harsh the performance.

 
Specification Brushes

 

Sponge Box

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WA-2220 - The sponge box serves to contain and weight a specified sponge for use in the test equipment. The sponge box may be used with any of the Gardco models. Two sponge boxes may be carried by the machine drive fork at any one time for multiple sample testing. Sponges for use in the sponge box are available as separate items.

The sponge box is designed for a sponge 3.9" long and 3.1" wide. Adjustable anchor bolts permit the use of sponges other than the normal thickness of 1.25" according to specification. The sponge box is fabricated from 1/16" stainless steel and has a weight of 16 ounces including the removable weight.

 
Sponge Box

 

Abrasion/Friction Boat

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WA-2225 - The abrasion boat is designed to hold in place against a flat surface any flexible material to be used against the test surface. The abrasion boat may be used with any of the Gardco models. Two abrasion boats may be carried by the machine drive fork at any one time for
multiple sample testing.

All parts of the abrasion boat are stainless steel and consist of a base plate, cover with adjustable anchor bolts and an auxiliary weight. The base plate is 2.0" wide, 4.0" long and 0.25" thick. It may be fitted with any flexible material which is 2" wide and between 6" to 8" long which is held in place by tightening the cover against the base plate. The assembly weighs 16 ounces with the auxiliary weight in place, providing a loading against the test surface of 2.0 ounces per square inch.

WA-2225 - The friction boat is identical to the abrasion boat and they are interchangeable. Increasing its usefulness for the measurement of friction is an auxiliary weight (WA-2227) which doubles the loading against the test surface. Most any flexible material may be secured to the friction boat base. Either the surface of the material secured to the boat or the surface on which it rides may be considered the test surface.

The weight of the friction boat without the internal auxiliary weight is one pound providing a unit area loading of 2 ounces per square inch. The internal auxiliary stainless steel weight increases the weight of the friction boat to two pounds for a surface loading of 4 ounces per square inch.

 
Abrasion/Friction Boat

 

Spherical Bed Abrasion Boat

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WA-2226 - This abrasion boat is designed to accept any flexible material in sheet form. Four balls force the material through accurate openings in the base plate giving the test material a spherical contour. The surface over which the boat moves can be of the same or any other material. This abrasion boat may be used with any of the Gardco models. Two of these abrasion boats may be carried by the machine drive fork for multiple sample testing.

The standard ball is chrome plated steel, 7/8 inch in diameter. Stainless steel balls and nylon balls of the same diameter are also available. Separation of ball centers at one end of the boat is 1.38" while at the other end it is 0.90" so they do not traverse the same path on the supporting surface, even in the center portion of the stroke. Base and top plates of the assembly are 1/16" stainless steel. They are 2.25" wide which permit use with the Lilly frame.

Weight of the assembly is one pound when steel balls are used and secured with the 0.54" high standard weight. This weight may be increased to two pounds with the placement of the auxiliary one pound weight above the standard weight. Weight of the assembly is eight ounces when nylon balls are used and secured with a 0.22" high standard weight (WA-2227). This may be increased to 24 ounces with the use of the auxiliary weight. The standard 1.5" long center post bolt must be replaced with a 2.25" long bolt whenever the auxiliary weight is used.

 
Spherical Bed Abrasion Boat

 

Measurement of Friction & Accessories

There are two basic reasons for measuring friction. The first is to determine the “slipperiness” of a surface. The other may be of much greater importance. It is quantifying a change in a surface as it is subjected to cleaning or wear testing. A simplified classical definition of friction is: Whenever an object moves upon another, resistance offered to the motion is called FRICTION. Characteristics of friction between such object surfaces are:
 
  • It varies with respect to the nature of the surfaces.
  • It varies directly with pressure between the surfaces.
  • It is independent, within limits, of surface contact area.
  • It is independent, within limits, of rate of motion.
  • Static (starting or break-away) friction is always greater than kinetic (sliding or motion) friction.
  • Coefficient of friction is defined as the force required to move one surface over another divided by the weight on the surface. The coefficient of friction has a wide range. For example: greased metallic surfaces may be as low as 0.05, wet leather on metal 0.36 and dry leather on metal 0.56.
 

In order to measure friction between any two surfaces, one surface must be moved with respect to the other. The pressure or loading between the surfaces must be fixed and known. The force required to start the motion and to retain it in steady state must be determined. Gardco linear motion test equipment with force measurement capabilities are ideally suited for measuring friction. Models with cut-out bases are designed for making measurements not only on prepared samples but also directly on the surface supporting the machine. The variable rate features of these models permit operating at a sufficiently low velocity so that kinetic energy and momentum factors may be neglected. A velocity of three to five inches per second is suggested when working with most surfaces. The force recorder is highly recommended for use in this measurement even though there is force indication on the machine panel. The recorder provides greater sensitivity and a high response record of force resistance throughout the machine cycle and for repeat cycles.

In order to provide a wide range of different surfaces and the loading on these surfaces, Gardco has produced an auxiliary weight for the abrasion boat and a modified sponge box to carry a much heavier weight. Both of these items are directly cradled by either the standard fork or extended machine drive fork.

 

Friction Boat

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Friction Boat

WA-2225 - The friction boat is identical to the abrasion boat and they are interchangeable. Increasing its usefulness for the measurement of friction is an auxiliary weight (WA-2227) which doubles the loading against the test surface. Most any flexible material may be secured to the friction boat base. Either the surface of the material secured to the boat or the surface on which it rides may be considered the test surface.

The weight of the friction boat without the internal auxiliary weight is one pound providing a unit area loading of 2 ounces per square inch. The internal auxiliary stainless steel weight increases the weight of the friction boat to two pounds for a surface loading of 4 ounces per square inch.

 

Friction Box & Sled (Complete)

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Friction Box & Sled (Complete)

WA-2224 - The friction box is the same as the sponge box except for accurately spaced holes to receive the friction sled bolts. The friction box may be used as a sponge box but the sponge box may not be used as a friction box. Design of the friction sled permits it to be secured in the friction box with either of its two machined sides exposed to the test surface. One side is machined with two wide runners which provides a loading on the test surface of 0.50 pounds per square inch. The other side is machined with two narrow runners increasing the load against the test surface to 5.00 pounds per square inch.

Weight of the friction box is 1.0 pound. The combined weight of the friction box and the friction sled is 4.8 pounds.

 
The friction sled is stainless steel with the ends of the runners rounded for ease of riding on the test surface. Most any material may be fabricated to fit and be secured into the friction box and used against a test surface. The stainless steel sled is only one example.

 

Accessory for Hardness Measurement

Hardness Measuring Boat

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Hardness Measuring Boat

WA-2326 - A small weighted ball resting on a coated surface will indent the surface even though only slightly. The harder the surface the less the indentation. The lateral force applied to the weighted ball to cause it to move is proportional to the depth of penetration. Gardco linear motion testing machines with force sensing have sufficient sensitivity to detect very small differences in such depth penetration. To take full advantage of this sensitivity this measurement should only be attempted with machines that interface and record results.

Rate of motion of the hardness boat is very important in this measurement due to the "elastic " nature of most coatings. Many surfaces will show a decrease in force to move the boat as velocity of movement increases. Therefore, making this measurement at different cycle rates is useful in the understanding of this property.

 
The base plate of the hardness boat is 1/4" thick stainless steel and is formed to receive three 3/8" diameter steel balls. The balls are held firmly in place with a ball retaining plate. Positioning of the balls is such that each carries an equal load of the assembly. Weight of the assembly as shown in the diagram is one pound. The weight may be increased to two pounds by the use of the auxiliary weight (WA-2227) shown with the friction boat (WA-2225).

 

Force Measurement and Recording

Force Recorder Study

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Drive fork force measurement throughout its cycle is registered in on a large digital display to the one-tenth pound on the front panel of all force transducer fitted F models. The current interface or I models come fitted additionally with an RS232 digital interface allowing for real time pc data analysis through data acquisition software. Earlier models were interfaced with an analog flat bed type strip chart recorder. An example of data study achieved through a scribed sinusoidal output strip chart recorder is as follows.

 
Basic characteristics of the recorder are:
  • Recording width: 100mm
  • Scale 0 to 100 in 2 mm minor and 10 mm major steps.
  • Chart Speed 1, 3, 6, 12, 30 and 60 cm/min, 1, 3, 6, 12, 30 and 60 cm/hr.
  • Signal Acceptance 1, 2, 5, 10, 20, 50, 100, 500 mV. Ranges 1, 2, 5, 10, 20, 50, 100, 250 V.
  • Dimensions 3" High, 12" Wide, 9.1" Deep
  • Weight 4.9 pounds.

Typical recorder patterns are shown in the following examples to the right:

Chart “A” is cloth on the friction boat working on a relatively soft coating with a loading of 0.25 lb/sq.in. and displaying significantly greater break-away friction than kinetic friction. Machine rate is 6 cycles per minute. Recorder is set at 500 mV with a chart speed of 12 cm/min.

Chart “B” is cloth on the friction boat working on a relatively hard coating with a loading of 0.25 lb/sq.in. and displaying break-away friction only slightly greater than kinetic friction. Machine rate is 6 cycles per minute. Recorder is set at 200 mV with a chart speed of 12 cm/min.

Chart “C” is the friction box and sled working on a relatively hard coating with a loading of 5.0 lbs/sq.in. and displaying coating failure after a significant number of machine cycles. Machine rate is 6 cycles per minute. Recorder is set at 2 volts with a chart speed of 12 cm/hr.

The recorder in addition to plotting the incoming signal displays its magnitude in a large digit LCD. On demand, the recorder prints on the chart the recorder status, measurement range and chart speed. The flat bed design permits ease of entering any desired additional notations on the chart. Recorder chart height is 100mm plus perforated feed extensions. The chart rolls are 16 meters long. The chart is marked with major divisions at 10mm and minor divisions at 2mm. The recorder ink pens are readily replaceable. Batteries placed in the recorder may be used for its power. This may be advisable in areas where line power has a high RF or noise component. Nine “C” cell batteries are required. The flat bed and plotting portions of the recorder are protected with a clear plastic cover. A carrying case is available for additional protection during transport. A detailed instruction manual is furnished with each recorder.

Chart A
Chart B
Chart C

 

Force Recorder Study

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Force Recorder Study

WA-2281 - Gardco linear motion machines equipped with variable speed, force readout and interface for external indicators and recorders provide a stable and sensitive direct current signal at the interface. Applications for highest degree of accuracy and repeatability require means for calibrating external instruments and recorders against this signal. The force checking assembly fills the need for this requirement.

An aluminum bar, 1.5" x 3.0", slotted on one end and fitted with a pulley on the other, is slipped onto the base plate of the linear motion tester so that the pulley is in line with one of the holes of the drive fork. A nylon cord supporting the selected weight is passed over the pulley and hooked onto the fork. The external indicator is then calibrated against the weight of the force checking assembly. This calibration may be done with a stationary fork.

The standard assembly is furnished with a one pound weight and a five pound weight. Other weights are available upon request.

 

Automatic Film Applicator

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This is a wet film applicator drive bar that replaces the drive fork on all 21 models of Gardner Washability, Abrasion and Wear Testers. The drive fork is simply removed by two bolts and replaced with the drive bar. It is made of one-piece construction and machined from 1/8" stainless steel. Most any design wet film applicator (with exception of wire wound rods) can then be positioned in front of the slotted horizontal drive bar frame. In operation, a panel pan can be mounted on the machine base. A Leneta chart or glass plate is placed in the pan. The counter is set for one cycle. The drive bar will move to left end and return to the right end. The slotted drive bar frame has two movable applicator positioning guides with thumb screws. These guides are moved to the right and left end of the applicator and screws then tightened. This maintains position of applicator on the Leneta chart. With applicator now in proper position on chart, pour sufficient quantity of material directly in front of applicator. Press "ON" switch and drive bar automatically pushes applicator across chart and lays down the wet film.

The machine will automatically return to starting point and then stop. The speed of drawdown can be adjusted and set on all machines with the exception of Model WA-2151 (D10) and WA-2171 (D16) which have a set speed of 14 inches per second.

 
Automatic Film Applicator

 

Technical Data

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Technical Data
Catalog No. Model No. Stroke Length Variable Speed Min Drawdown Speed In Inches/Sec Max Drawdown Speed In Inches/Sec Tray Size
WA-2117 D5.5VFI 5" Yes 2 20 8 x 18"
WA-2123 D7V 7" Yes 2 20 8" x 18"
WA-2125 D7VF 7" Yes 2 20 8" x 18"
WA-2127 D7VFI 7" Yes 2 20 8" X 18"
WA-2133 D8V 8" Yes 2 20 8" X 18"
WA-2135 D8VF 8" Yes 2 20 8" X 18"
WA-2137 D8VFI 8" Yes 2 20 8" X 18"
WA-2143 D9V 9" Yes 2 20 8" X 18"
WA-2145 D9VF 9" Yes 2 20 8" X 18"
WA-2147 D9VFI 9" Yes 2 20 8" X 18"
WA-2151 D10 10" No 14 14 8" X 18"
WA-2153 D10V 10" Yes 2.3 23 8" X 18"
WA-2653 D10VP 10" Yes 2.3 23 8" X 18"
WA-2155 D10VF 10" Yes 2.3 23 8" X 18"
WA-2157 D10VFI 10" Yes 2.3 23 8" X 18"
WA-2164 D12V 12" Yes 2.2 22 8" X 24"
WA-2166 D12VF 12" Yes 2.2 22 8" X 24"
WA-2168 D12VFI 12" Yes 2.2 22 8" X 24"
WA-2171 D16 16" No 14 14 8" X 24"
WA-2173 D16V 16" Yes 2.7 27 8" X 24"
WA-2175 D16VF 16" Yes 2.7 27 8" X 24"
WA-2177 D16VFI 16" Yes 2.7 27 8" X 24"
V = Variable Speed   F = Force Sensing   I = Built in Interface

 

ASTM D2486 Standard Test Kit - WA-215111

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ASTM Kit

Kit only works with 7,8, 9 and 10 inch machines. Machines not included in kit. ASTM D2486 Standard Test Accessory Package includes:
  • WA-2230 Lily Frame
  • WA-2205 Pan
  • WA-2235 Glass Plate
  • WA-2211 Brush Box
  • WA-2272 Nylon Stag 5x4x13
  • PC-GP121-10N Gardco Scrub Test Panels
  • WA-2228 Brass Shims




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