I would like to mount my Dremel 4000 so I can use it as a stationary tool, e.g. a self-made CNC. There are several pages on the web and many videos on youtube showing the Dremel fixed in a box-like jig. But I think it would be much easier to mount the end of a flex shaft rather than the tool itself.

So before I buy the flex shaft I would like to know:

  • how it behaves at 35000RPM ? How long can I run it?
  • do I lose on torque or power when working with the flex shaft?

I plan to work with wood and I can set up the tool so the flex shaft will hardly bend.

  • Get a laminate trimmer (mini-router - bigger than a dremel, smaller than a normal router, much better bearings than a dremel, easier to mount than a dremel, run about 30,000 rpm.) The flex shafts do rob power and add another thing with usually poor bearings to wear out, but I don't know of anything quantifying "how much power" they lose. The poor bearings especially for continuous operation are a problem with the Dremel in a CNC mode, where the tool is running for quite a long time, and slop in the bearings makes for a poor/inaccurate cut. Or get a watercooled spindle if you prefer quiet. – Ecnerwal May 20 '14 at 1:40

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