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Chart
for Caster Rollability
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We ordered a set of our competitors product.
Our competitor said that their product
was easier to roll than ours. We tried
theirs on our test vehicle (a 1967 Big
Block Corvette) and it was obvious that
ours were a lot easier to push, but we
wanted absolute proof. We had some
engineers from a caster test lab load
the casters with various weights and we
used a digital force meter for accuracy
and test for initial and continued forced
required to the casters. Well, we're
pretty happy with the results as you can
see by the adjacent graph.
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So we then asked the engineers why ours were so much easier to push.
The answer was that the plastic wheels they use are much softer (a
"65" hardness). It's kind of like pushing a
stalled car with 4 1/2 flat tires versus inflated tires. The
rolling resistance is much greater requiring more oomph!
Make sense! Also, their caster had no wheel bearings and the
axles simply rides on the hub of the wheel!
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