I wouldn't bother; Dremel tools have a plastic frame which heats up and distorts when they're used as CNC spindles. Keep that for occasional hand work and get something else that will last longer than an hour or two into a cutting job. I've heard that some people have had pretty good luck using a Proxxon IB-E as a light-duty spindle for use with small cutting tools, and it has enough speed for engraving with ball-end tools: http://littlemachineshop.com/product...ProductID=2891