edm fluid, home grown CNC

Hi folks just joined the group, (my first) In Oz many years ago kero
was the only fluid used, I suspect that providing the level is well
above the elctrode/work interface there wouldn,t be a problem. I know
of one guy who used to leave it running all night unattended, had a
heat sensor connected to 2 fire extinguishers. Don't know how he
slept. Does anyone know where I can get Volt/amp specs for Sigma
steppers? (out of business several years) model Nos. 20-3424D-24450 &
17-3424D-24054. Plan to build a small CNC mill for clock parts (lots
of questions over the next few months) Thanks in advance, Ian.