Maybe someone might reply if I'm less specific in my subject line :-)
I'm rebuilding a Myford ML4 (3.75" centre height) lathe at present. When I bought the lathe I found, too late, that the headstock spindle and bearings were badly scored. I bit the bullet and had the damaged spindle hard chromed and reground. I've fitted a set of good bearings, from a spare headstock but when I went to fit the spindle, it was very tight, and when fully home, was almost impossible to turn. I dismantled everything and measured to OD of the bearings; the original bearings were found to be .003 smaller (measured in the 'sprung open' form) than the ones I used as replacements; measuring the bore in the headstocks showed the same difference with the spare headstock having the larger bore. My question is, what would be the best way to adjust the bearings to size, do they need to be line-bored after fitting to the headstock? If you're not familiar with this lathe, the bearings are plain bronze split bearings mounted in a split headstock bearing housing (not removable bearing caps). Martin.