Using a grinder with a speed regulator will help
you achieve the optimal finish. An adjustable belt
grinder arm on the tool makes it easier to use,
decreases the fatigue you’ll experience, and yields
PREP AND FINISHING WORK ON
For a typical No. 4 finish with RA 15-25 on a pres-
sure vessel, use a 40- to 320-grain belt grind and fin-
ish with a flap brush. You can create a satin finish by
using a nylon flap brush followed by polishing with
a buffing wheel and a cutting/polishing compound
(see Figure 2).
Many finishing tools offer quick-change tooling
systems to reduce downtime, and many are portable. Keep in mind that portable tools with detachable handpieces reduce fatigue because they don’t
have to carry the weight of the entire drive unit (see
Figure 3). Some models are available for working in
very confined and hard-to-reach places.
Look for dust-sealed units with low noise levels
and vibration-free operation. Air-cooled induction
motors can provide long service life and minimum
Left: Figure 1. Blending welded surfaces on corners, squares, and
rounds is the key to producing attractive welded connections on
Bottom Left: Figure 2. A nylon flap brush followed by polishing
with a buffing wheel and cutting/polishing compound can create a
satin finish on a pressure vessel.
Bottom Right: Figure 3. Grinding on a cylinder surface is made
easier with a flex-shafted tool because the weight of the power unit
is not carried by the operator.