After reading several articles with their own subjective evaluation of
ROSs, I decided to apply a simple numeric test to compare two of them
and I was surprised by what I found. I hope you find this interesting
and useful to decide your next ROS purchase.
The fairly straightforward logic goes like this:
1. Unlike disk sanders, each grit particle on an ROS moves in a more or
less circular orbit, and ALL of them move in the same orbit (as long as
the pad is not spinning wildly)
2. Call the orbit diameter "D" and the OPM (orbits per minute) "R".
Simple math tells you that each particle travels a distance of pi*D
inches per orbit, and pi*
D*R inches per minute, or pi*
D*R/12 feet per
3. To compare, say, the Ridgid R2610 with the PC 97366 and with a belt
sander, consider this:
- the R2610 has R=1/4 and R (max) = 10000 in aggressive mode. This
gives the particles a speed of 655 feet/min
- The PC97366 has R=3/16 and R(max) of 6000, giving it just 295
Incidentally, the amperage on both is about the same too.
Startled? I sure was.