John,
My concern isn't really about the wire scraping during twisting.
I am more concerned with ruining/scrapping(not scraping) a couple
thousand feet of wire due to wire breakage from the twisting process & the wire being brittle.
It would be hard to tell if there was wire breakage while twisting the wire until it's done and too late, unless the ends
of the wire are available to use an ohmmeter.
What is the coating on the wire?
Do you think the wire failure was due to dielectric breakdown or abrasion from vibration?