I'm rebuilding a Bridgeport Series II for the last 2 years. Cleaned out a garbage can of shavings, re-scarped the saddle piece, cleaned ball screws, painted it and now reto an Ajax/Centroid control. The old Heidenhain 3 kw auto transformer will work on 240 single ph. and deliver 85-90 volts ac @ 30 amps for the DC servo supply. This works out well by rearrainging the taps.
My question is: This is an "auto transformer" (no secondary winding). Some have said this is spooky if you lose the gnd conn. Blue smoke and all. I'm torn about winding a new pwr transformer with a secondary if I don't have to. 50 years ago I designed and built transformers but I'm old and tired now and square wire is nasty.
This is my first post. I hope I'm doing this right.
Thanks for any info.
Billy Bird