I have seen the wire stripper with the V in it before.

I have also seen another thats just two driven rollers with a tiny gap between.

It seems to work by just squashing the wire & the rubber insulation gets cut in half by the wire.



ie; the gaps a little bit smaller than the wire, the rollers grab the wire & pull it thru, as it does this the insulation gets squashed & broken into two.
You would have to hand rip the insulation off the wire afterwards, but its a lot better than other methods.

I figured I could make one from two electric motors 'shaft-iron core-bearings' & some way to drive both spindles at the same times in the same direction ( bicycle sprockets & chain)
Then a way to set the gap between the rollers (iron core) sorta setup like the wringer washing machines.

In my dreams...............