I've worked in many shops(I'm a Journeyman), and have only seen one instanc e where 2 women ran a surface grinder on opposite shifts. They ground mould plates(core;cavity;manifold etc.) which aren't hard to do(simple job), al though the tolerance was within a couple of .0002" tenths. They had to lea rn how to check their depth mics and make sure they were always spot on. I see far more women operating back hoes etc. than I do in machine shops.