DJH MEK RUB TEST MACHINE User manual

MEK RUB TEST MACHINE
USER MANUAL
Everything you need to know about setting up & using your MEK Rub Test Machine by DJH Designs Inc.

©Copyright DJH Designs Inc. 2018
All Rights Reserved. Reproduction, adaptation, or translation without prior written permission is prohibited,
except as allowed under the copyright laws.
Publication number :: A20029-9500M
First Edition , January 1992
First Revision, September 1994
Second Edition, June 1995
ird Edition February 1997
Fourth edition January 2000
Revised November 2003
Fih Edition January 2007
Revised February 2008
Sixth Edition January 2010
Eigth Edition May 2018
Printed in Canada.
Warranty
e information contained in this document is subject to change without notice.
DJH Designs Inc. Makes no warranty of any kind with regard to this material, including, but not limited to,
the implied warranties or merchantability and tness for a particular purpose.
DJH Designs Inc. shall not be liable for errors contained herein or for the incidental consequential damages in
connection with the furnishing, performance, or use of this material.

3
INDEX
Section Page
Manual Conventions 4
Unpacking & Installation 5
Installing MEK Reservoir 6
Air Supply Connection 8
Installing the Safety Cover 9
Replacing the Rubbing Pad 10
Filling the MEK Reservoir 11
Testing a Panel 12
Adjusting the Rubbing Block 15
Setting the Number of Strokes 16
Running the Rub Test 17
Maintenance 18
Machine Specications 19
Where to Find Help 20
Warranty 21
Repackaging Guidelines 22
Survice & Support 24
Service Request Form 25
Hardware Installation 26

4
MANUAL CONVENTIONS
To help you nd important information quickly, and make instructions easier to understand, this manual uses the
following conventions:
Italic refers to a document title or is used for emphasis.
Bold refers to new terms or is used for emphasis.
Notes contain important information set o from the text.
Caution messages appear before procedures which, if not observed, could result in inaccurate
data or in damage to the equipment.
Warning messages alert you to a specic procedure or practice which, if not followed
correctly, could cause serious personal injury.
Contains helpful information about a procedure or practice
NOTE
CAUTION
WARNING
TIP

5
UNPACKING MACHINE
1. When rst opening the box, rst remove the safety
cover, then remove other components underneath.
3. Remove foam insert 4. With the help of another person, carefully li the
MEK machine base from the box.
2. Remove box underneath safety cover containing
the MEK resevoire.

6
MACHINE INSTALLATION
Select a suitable area for the machine. e machine weight is 62.5 lbs. (30 kg) and must be installed on a sturdy
work bench that will be able to absorb the inertia of the dead weight rubbing block being shuttled back and forth.
It is recommended that the work area have at least 30cm clearance on all sides.
e machine comes with two (2) mounting plates to secure the machine to the tabletop. Please refer to the diagram
below for recommended method of installation. Place the anti-skate pads under the corners of the machine as
shown. For metal bench tops mark the screw locations drill pilot holes and then screw the brackets onto the
worktable surface. For wood benches and surfaces simply attach using #10 wood screws.
Failure to secure the machine to the work table may result in the machine falling o the table, serious damage
to the machine and or personal injury can occur due to the weight of the machine.
Anti-Skid Pad
WARNING

7
UNPACKING & INSTALLATION
Installing MEK Reservoir
1. Locate the two (2) rivnuts for the reservoir
2. Mount the two (2) screws for the reservoir
assembly as shown using the 1/8” allen key.
Do not over tighten the screws as it is possible
to strip the rivnuts if too much force is
applied.

8
UNPACKING & INSTALLATION
Installing MEK Reservoir
3. Connect the ow line coming from the
rubbing block to the ow valve located on the
bottom of the reservoir as shown
4. Tighten the tting by hand then use a
10mm wrench tighten an additional ¼ turn.
Excessive tightening may collapse the ferrell
and restrict the solvent ow.
5. Connect the air supply line from the
machine base to the back of the reservoir
assembly.

9
UNPACKING & INSTALLATION
Installing the Safety Cover
Align Front of cover to the front edge of the base plate and then align the holes in the cover to the holes in the
mounting blocks. You may have to rotate the mounting blocks to be in the correct orientation prior to sitting the
cover on the machine. Install the two mounting screws with the large diameter at washers supplied. All machines
are equipped with a cover interlock and the safety cover must be installed to operate the machine.

10
UNPACKING & INSTALLATION
Air Supply Connection
e MEK Rub Test machine is supplied with a 2 stage air lter assembly pre-installed on the back of the unit,
bypassing or removal of these lters will void the machine warranty, if problems due to lters plugging up occur
the air supply problem should be addressed before continuing use of the machine.
Air Supply shuto, before connecting the airsupply
to the machine make sure that the machine airshut
o valve is in the closed position. (Pull up on the
handle to shuto air supply)
Connect the air supply to the inlet side of the lter
assembly
Clean, dry, oil free air only, any use of oiler’s or dirty
air supply will void your warranty. Use of synthetic
oils in the air supply can cause severe damage to
the internal valve seals and must be avoided
Once the air supply has been connected push the handle on the top of the lter assembly down to supply air the
machine pneumatics, check the pressure gauge (located in regulator) on the tower face on the front of the machine.
e correct operating pressure is 80 psi (550 Kpa). If the pressure is not correct adjust the regulator to the correct
pressure.
Correct operating pressure is important to achieving accurate test results, incorrect pressure
will eect the number of strokes/min. Set pressure to 80 psi (550 Kpa) setting is done statically
do not try to adjust the pressure while the machine is running.
CAUTION
CAUTION
NOTE

11
UNPACKING & INSTALLATION
Replacing the Rubbing Pad
The MEK rub test machine is equipped with a safety
latch device, this latch will prevent the head from in-
advertently falling back down onto the base plate if the
machine happens to be bumped or if the head was not
raised up fully to the over centre position of the head.
Raising the head requires no operator interaction with
the latch; the unit is spring loaded and will slide back as
the head is raised against it. Once the head is raised past
the latch point the latching device will snap back into
place the head is now in the up and locked position. To
lower the head, raise the head up fully if it is resting on
the latch and with your free hand depress the latch and
lower the head.
1. Rotate the holding plate 90° and li o. e plate is
magnetically held to the rubbing block.
2. Remove the old pad and discard
3. Cut the cotton pad into quarters and place the clean pad
(approximate size 1½ x 1¾), double ply, diagonally over
the plastic button, corners of the pad between the magnets.
4. Re-attach the plate at 90° and rotate back into original
position
5. Wet the new pad with the MEK

12
UNPACKING & INSTALLATION
Replacing the Rubbing Pad
4. Re-attach the plate at 90° and rotate back into original
position
5. Wet the new pad with the MEK

13
UNPACKING & INSTALLATION
Filling the MEK Reservoir
1. To ll the MEK reservoir, rst remove the ller
cap.
2. Use the Squeeze bottle provided to ll the
reservoir, approximately 425cc. e reservoir has a
site level so that you can see the level of MEK in the
reservoir at all times.
Do NOT try and pour MEK or any other solvent
from an open container, use only the squeeze bottle
provided or an equivalent type of container.
3. Adjusting the ow rate; the ow rate of the valve
has been preset at the factory, however you may
nd it necessary to adjust the ow rate to suit a
particular test or a dierent pad material type. e
rate is adjusted by opening or closing the control
valve located on the bottom of the main valve body.
You only require enough MEK owing to keep the
sample wet if the MEK begins pooling rapidly then
cut down on the ow rate. If you are unable to
adjust the ow rate, the ow control valve metering
orice may be blocked with contaminants.
It is recommended that you lter the solvent prior
to lling the reservoir to prevent dirt and other
contaminations from blocking the small orice in
the metering valve.
CAUTION
NOTE
2. Filling Reservoir
3. Adjust ow rate by rotating

14
TESTING A PANEL
Minimum size 13cm (5”) x 30cm (12”) (unless equipped with variable stroke kit).
Place the panel on the test area, butt the right edge up against the locating pins under the panel holding clamp, and
slide the top edge against and under the stop bar. e stop bar is machined with a taper so if the panel has a bow
it will help to hold it at.
Turn the clamp lever Clock Wise to secure the panel. If the clamp rotates too far clock-wise (i.e. 3 O’ Clock
position, return it to the vertical position and turn the knurled knob a quarter turn and try again. Do not use
excessive force to clamp the panel), Turn the lever Clock-wise just tight enough to secure the panel.
Do not use a panel shorter than 30cm (12”), if the panel is too
short and the nozzle is allowed to ride over the edge of the
panel as shown, it will damage the solvent nozzle.
An optional Variable Stroke Kit is available for testing short
panels.
CAUTION

15
OPTIONAL VARIABLE STROKE KIT
e Variable Stroke Kit is an add kit that allows for the use of non standard size panels ranging in length from 9cm
(3.5”) to 30cm (12”).
Adjusting the stroke length; when testing non standard length panels it will be necessary to adjust the stroke length
so that the nozzle cannot ride over the edge of the panel as shown below and cause damage to the nozzle.
1. Turn o the air supply to the machine by pulling up on the
shuto valve located on the top of the lter assembly.

16
OPTIONAL VARIABLE STROKE KIT
2. Move the rubbing head by hand until the nozzle
is positioned completely on the test panel close to
the le edge as shown.
3. Locate the bolt on the stop block at the back le
and loosen with a ⁄” wrench.
4. Move the bumper until it comes in contact with
the head.
5. When running the machine, the absorption
of the bumper is approximately 1cm (0.39”), so
take that into consideration when setting up your
variable sample.
6. Fasten the bolt on the stop block to tighten into
place.

17
ADJUSTING THE RUBBING BLOCK
Adjustment to the rubbing block is normally only required if you want to change to running much thicker test
panels. However, periodical adjustments to the rubbing block alignment may be required if the head has been
dropped onto the sample to hard, or has been shied for any reason.
To adjust the rubbing block, remove the MEK Pad (see page 10) and lower the head down onto the sample you
want to test. Looking from the side of the block you can see that the button does not sit squarely on the sample.
Loosen the 2 bolts that hold the block to the “H” arm, rotate the block forward and back to sit it squarely on the
sample. Retighten the bolts, replace the pad and you are ready to begin your test.

18
RUNNING THE MACHINE
Setting the Number of Strokes
Preset the number of strokes (forward and back, a “double rub” counts as one stroke) press the button to the le of
the digital counter display and hold it down. Press the buttons under each digit (ones, tens, hundreds, thousands)
to select the number of strokes on the display. e counter will count down as the machine runs its test. To reset
the counter to your original preset number of strokes simply press the button to le of the display again, only this
time just press and release the button, the counter will return to the preset number of strokes.

19
RUNNING THE MACHINE
Running the Rub Test
Please make sure that you do the following before running MEK Rub Testing machine:
• Filling the MEK Reservoir (page 11)
• Testing a panel (page 12)
1. Lower the block onto the panel (push unlock
lever to lower the block)
2. Set number of double rubs (see previous page)
3. Press the start (Green) button. On completion of
the preset number of strokes the machine will stop
automatically.
You can stop and start at any point during the count down with no interruption to the cycle
total (i.e. the stop button is depressed during a cycle the counter stops at 25 strokes remaining,
pressing the start button will begin the count down from that point, 25 remaining strokes).
Dierent pad materials will aect your test results, if you are trying to correlate your results
with another unit it is important to make sure that you are both using the same pad material.
e cotton pads provided with the machine are ASTM compliant and can be purchased
through DJH (PN: 1963)
To establish the required number of strokes that is acceptable to your standards, run a known
panel by your hand method, and run a parallel test on the same panel with the machine. Stop
the machine when the results appear similar. is will be your new test requirement.
NOTE
NOTE
TIP

20
MAINTENANCE
Be sure to check the coalescing air lter and replace as required.
If you notice a continued drop in air pressure to the machine, it is a good indication that the
coalescing lter element requires replacement.
Check the secondary lter assembly and service as required.
Lubricating the rubbing block hinge pin
Use the supplied grease gun and add grease until
you see the overow from both ends of the pin as
shown in the image.
Hinge pin and slide must be lubricated weekly.
Hinge pin; watch for over ow from both ends
NOTE
NOTE