John - this is really helpful. How do you know if a lathe is Series O or N? By serial number? This link does not have O on it: https://www.southbendlathe.com/older-machines/serial-numbers . Or do you have to literally go through features to decide if Series O or N? Sorry for all the detailed...
Thanks - I checked out the link (I had seen a different version before). I did not see a mention of Series O in it. How is Series O defined? Certain years?
Would later series (like Series N?) have the 5C collets? Are larger spindle bore and 5C compatibility the main advantages of a later series?
I'm new to forum and not a professional machinist. Hope this is an ok question to ask. I googled the SB 13, but there was surprisingly little info out there in forums or in the old catalogs.
I'd like some advice from the SB experts in the forum on these two questions:
1) How much of an upgrade...