True I'm a sucker for books and will read anything engineering related. Not everyone enjoys wading through detail especially when the style is indifferent, illustrations poor, content disorganised or badly dated, and the book has a weak index when you're looking for something in particular.
Even so, I feel a small library is a worthwhile investment even if it's only Machinery's Handbook or a Zeus, plus one or more of the suggestions already mentioned.
If money is no object, 'Machine Shop Knowledge' and 'Machine Shop Essentials' are worth having because they're not just about mills and lathes.
One thing to watch out for is technical books with a bias. Naturally enough the South Bank Book promotes South Bank lathes (it's still good). Sparey is distinctly Myford and British circa 1952. The 'Machine Shop' books are pro-western and overly dismissive of the competition; they were written just as Far Eastern kit was starting to threaten US made alternatives and promote 'quality' rather than 'fit for purpose'. They're still good, provided you understand that it's not absolutely necessary to own a Bridgeport to do effective milling.
I find old lathe books to be particularly useful,. I think it's because they were written when manufacturing was dominated by skilled men driving basic lathes just like ours and they had many clever ways of getting the best out of manually operated kit. Modern industrial machining is remarkable but most of it is well beyond the reach of a hobbyist. When I want to turn a long rod accurately it doesn't help to read I can knock them out dirt cheap by the million with an automatic grinding machine.
Dave
Edited By SillyOldDuffer on 06/06/2018 10:16:03