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model 384B South Bend

post a photo of the apron, but I believe it's probably an O series, being a 384 silent chain drive. Most of the N series 11-inch lathes were 164 UMD's
There are 2 for an O series on eBay.
 
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post a photo of the apron, but I believe it's probably an O series, being a 384 silent chain drive. Most of the N series 11-inch lathes were 164 UMD's
There are 2 for an O series on eBay.
 

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Yes, it's an O series. The compound gears listed on eBay for an 11-inch O series will fit,
but you might want to look at the gears to see if they are stamped with a gear mesh clearance number. Like M-10 or P-10, M=minus and P=plus. if has them, I would message the seller and ask what the clearance numbers are. The numbers are 10=0.010, 20=0.020 and so on. These are for stack-up error from fitting the apron to the saddle in assembly. You can over-come this to a degree if the gears are different, by shimming or scraping the apron, but you have to take in consideration that the lead screw alignment to the apron will also change if you do this. Best option would be the same number or a slightly higher P umber to shim.
 

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