Re: rod-mill project - "mains" electric motor advice

"Jim Wilkins"  wrote in message news:101c3an$euht$1@dont-email.me...

" second hand dealers who buy auction lots of industrial equipment "

At one that is closing I bought what they had in 10TPI Acme taps. Two are over and under 0.500", 0.480" and 0.520". The size doesn't matter if I'm making a replacement shaft, but what would they normally have been used for?