Dynabrade: "Swirl-Free Checklist" For Dynabrade Random Orbital Sanders


“Swirl-Free Checklist”
For Dynabrade Random Orbital Sanders
Sanding Techniques (Continued)
Follow a set pattern when sanding. It is suggested to
pass over the surface following a “North, South, East, West”
pattern (see below), overlapping each pass 1/4 the diameter
of the back-up pad and
abrasive. This insures
that the previous
scratches are
removed and
that a uniform
finish is achieved.
Two “patterns”
per sanding
step are
Frequently inspect abrasive for tears, folds, or build-up.
When changing abrasive to proceed to the next sanding
step, first inspect the condition of the abrasive that is on
the sander. If any defects are noticed in that abrasive,
remove it and install another piece of the same grain and
sand the work surface again before proceeding on to the
next sanding step.
Always clear away sanding dust and abrasive debris
before progressing to the next sanding step with a finer
“grit” abrasive.
Equipment Check:
Random Orbital Sander
90 PSIG (6.2 Bar) is the required operating
air supply pressure. Check the air pressure at
the sander while it is running. Note: Promote the
use of Dynabrade maximum flow plugs and couplers
to ensure proper airflow.
Confirm that the tool is running at the rated “Free Speed” RPM.
On an average a 10,000 RPM non-vacuum sander will run at 9,500
RPM; a 12,000 RPM non-vacuum sander will run at 11,500 RPM.
A vacuum sander normally runs slightly slower.
Inspect the balancer bearing (pad bearing). Remove the back-up
pad and rotate the balancer bearing shaft while holding the
counterbalance stationary. The balancer shaft should turn freely.
Back-Up Pad
Inspect the face of the sanding pad. The pad must be flat and
smooth, without any defects. Check if they are using a Dynabrade
back-up pad that is “weight-mated” to the sander. Using another
pad can make the sander vibrate excessively and lead to an
unacceptable finish.
Sanding Techniques:
Always START the sander ON the surface, and STOP the sander
OFF the surface.
When sanding keep the sander, and pad FLAT on the surface.
Important: Do not exert heavy downward force on the sander.
Apply enough downward force to keep the back-up pad and
abrasive flat on the surface allowing the back-up pad to orbit
freely over the surface.

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