Dremel flex shaft problems

Well if it says you can bend it to a 6" diameter and you can't get it to work on a 16" diameter, I would say there is something wrong. Will it work on the 6" diameter? Try turning up the speed the more the diameter is increased.

These are all just guess'

Good luck!

If the tool is spinning, but the bit is not, then you have slippage in the connection between the flex shaft. When you are bending your shaft, it is increasing friction, eventually to the point where it is overcoming your connection. If I recall correctly, there is a set screw in the system that clamps the internal shaft - I would check that first. I believe those cables need to be lubricated from time to time too, but that is not causing your current problem - the tool would stop running if the shaft was binding.

I hope this helps you

Kurt