The only type of wire I've been stripping is TV/CRT degaussing cables. Using a utility knife and some cursing. It's kinda pain in the neck. It should be possible, though, to come up with some type of small gizmo/jig that would allow me to hold the cable in one hand in between two sharp ends and slice the insulation by pulling the cable though with the other hand. The trick is to find the right type of metal that would be soft enough to allow to be squeezed by the thumb and the index fingers while being hard enough to cut through the insulation without bending. It seems that if one can make such a gizmo, it would allow them to clean up degaussing cable much much faster. But of course I am still trying to make the gizmo. So far no success...