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Operation
Refill the Pot with Media
As abrasive media leaves the pot during blasting, follow
the Fill Pot with Abrasive Media procedure, page 14.
NOTE: If the pot loses pressure, follow the Pressurize
the Pot procedure, page 16.
Set the Abrasive Metering Value
The optimal setpoint of the abrasive metering valve and
corresponding MediaTrak CPM value varies significantly
depending on application and user desired
performance. The General Application Guides, page
21, describe the generally accepted range of CPM
setpoints based on the substrate and blast pressure
setpoint. The gray highlighted area illustrates the typical
range of blast pressure setpoints and their
corresponding CPM setpoints for that substrate.
To find the recommended CPM setpoint, select the table
that most closely matches the substrate that is to be
blasted. Determine the blast pressure setpoint based on
the media that is being used, and the desired surface
profile to be achieved. Then, use the corresponding
lines on the chart to select the appropriate CPM
setpoint.
For inexperienced users, select a blast pressure near
the low end of the highlighted range. Increase blast
pressure and CPM until the desired profile and removal
rate are achieved.
20
Optimize the Abrasive Metering
Value
To optimize performance, use the High Production or
Media Efficient lines on the charts. CPM setpoints near
the High Production lines will yield the highest removal
rates, and the highest media consumption rates. To
maximize removal rate regardless of media
consumption, use the highest possible blast pressure
and set the CPM to the highest achievable value that
produces a consistent pattern. The CPM setpoint is too
high if the flow from the nozzle starts to sputter.
CPM setpoints near the Media Efficient line will use the
lowest amount of media. To minimize cleanup and
media usage, use a setpoint closer to this line.
Generally, removal rates will be less than average when
setting the CPM according to this line.
The charts on the following page are only guidelines.
They were developed using garnet media in the 30-80
mesh range. Coarser media will produce a deeper
profile, but will require higher CPM setpoints to yield
similar removal rates to the setpoints shown in the
tables. Finer media will yield higher removal rates, but
will not produce as deep of a profile.
Fine tuning and experimentation are necessary to
optimize performance for each application.
See the General Application Guides, page 21.
3A3489T
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