INEX SUCTION BLAST CABINET With VACUUM COLLECTOR Page 9
© 2005 CLEMCO INDUSTRIES CORP. • www.clemcoindustries.com • Manual No11217 Rev. E 03/05
7.5 Media Bridging
7.5.1 Frequent bridging or blockage in the media
metering valve can be caused by damp media. Media
becomes damp by blasting parts that are slightly oily,
from moisture in the compressed air line, or from
absorption.
7.5.2 To avoid contaminating media from the
workpiece, all parts put into the cabinet should be clean
and dry. If parts are oily or greasy, degrease and dry
them prior to blasting.
7.5.3 Moist compressed air. This can be caused by a
faulty compressor that overheats, or pumps oil or
moisture into the air line, too long an air line permitting
moisture to condense on the inside, or from high
humidity. Drain the air filter and receiver tank regularly. If
the problem persists, it may be necessary to change
media more often, or install an aftercooler or air dryer.
7.5.4 Absorption. Some media tends to absorb
moisture from the air, especially fine-mesh media in high
humidity areas. Empty the media and store it in an
airtight container when cabinet is not in use.
7.6 Neither Media Nor Air Comes Out The Nozzle
When The Foot Pedal Is Pressed.
7.6.1 Blocked or leaking control lines. Check all
urethane tubing for blockage or leaks.
7.6.2 Foot pedal valve malfunction. Check foot pedal
alignment, and inlet and outlet lines for pressure.
7.6.3 Check that lines are not reversed on the foot
pedal or pilot regulator. See schematic in Figure 18.
7.6.4 Pressure regulator may be turned down or off.
Check pressure on pilot regulator.
7.6.5 Make sure that the air compressor is on and air
supply valves are open.
7.6.6 Check the nozzle to see if it is plugged. See
Section 7.4.
7.7 Blasting Does Not Stop When The Foot Pedal
Is Released
7.7.1 Make sure that the 3-way valve in the foot pedal
exhausts air when the pedal is released. If it does not,
check the line for blockage, and check the switch for
defect.
7.8 Blockage In Media Hose
7.8.1 Media obstructions. Usually caused when the
media mixture is too rich. Adjust media/air mixture per
Section 4.3.
7.8.2 Wet or damp media. See Section 7.5.
7.9 Media Surge
7.9.1 Heavy media flow. Adjust per Section 4.3.
7.10 Poor Suction In Media Hose
7.10.1 Inadequate air supply. Check the tables in
Figures 2 and 3.
7.10.2 Air jet needs adjustment. Check adjustment per
Section 4.2.
7.10.3 Nozzle is worn. Replace if worn 1/16" or more.
7.10.4 Blockage in media hose or nozzle. See Section
7.4 and 7.8.
7.10.5 Wrong size combination of air jet and nozzle
See table in Figure 2.
7.10.6 Air jet sleeve extends past end of air jet. Cut the
sleeve to align with the air jet.
7.11 Blow-Back Through Media Hose
7.11.1 Blockage in nozzle. Remove the nozzle and
check blockage.
7.11.2 Air jet may be too large for nozzle. See table in
Figure 2.
7.12 Static Shocks
7.12.1 Cabinet and/or operator not grounded. Abrasive
blasting generates static electricity. The cabinet must be
grounded to prevent static buildup. See Section 2.4. If
shocks persist, the operator may be building up static.
Attach a small ground wire (such as a wrist strap), from
the operator to the cabinet.
7.12.2 Avoid holding parts off the grate. Static will
buildup in the part if not dissipated through the metal
cabinet.
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