Perhaps the problem is in the fact that I'm using a Dremel
multi-pro rather than a proper flex shaft? I know that when I use
a proper flex shaft the wheels do seem to last longer and operate
more effectively. Which leads me to realize I need to seriously
consider an upgrade...rats! Anyone else had trouble making the 3M
Radial Bristles last?
Any abrasive will wear down with use. Compared with standard
silcone rubber abrasive wheels, the bristle disks last a lot longer.
But it's not reasonably to expect these to stand up to long hard use
without wearing down.
On the other hand, if you're using your dremel at full speed, then
you're likely got getting the most efficient use of the disks. They
seem to run best for me at the lower end of the rpm range, say around
5000 rpm or so. Also, I note that the smaller sizes, being more
flexible bristles perhaps, seem to last longer than the larger ones.
The 1 inch brushes seam to wear away slightly quicker than the mid
Also, don't equate wearing out with breaking in a bit. The don't
stay looking new very long, but then, after wearing a bit, last quite
a bit longer like that before being worn down too much to use.