Heat can definitely be a problem with drills.

We use Dremel drills, because of their long history of excellent products. While heat can be a problem, our drills can be set as low as 5,000RPM's, which is plenty slow enough to remove concerns about heat. Although this is lower than LR's 8500RPM, even those would be fine. You start running into problems when you get up to the 15,000RPM range.

[b]Jeff Higgins
Delta Kits, Inc.
jhiggins@deltakits.com
www.deltakits.com</p>