What you attach to this shaft — the mandrel — defines what you can do with the gadget, and an awful lot of useful things spin around. Dremel's rotary tool attachments are color-coded according ...

This is exactly what [Daniel Jose Viana] did when his 110 volt Dremel tool popped its TRIAC after he plugged it into a 220 volt outlet. [Daniel] knew how the TRIAC functioned in the circuit and ...