I am not familiar with the S11, I haven’t even seen one in person, but it seems to follow the V13 very closely, I did reset the headstock on my V13 once (after 20 years use) when I detected an error of 0.01mm (0.0004”) over 100mm, This is not to be undertaken lightly, I spent about 4 hours before I got it down to 0.005mm (0.0002”) in 100mm.

Frank.

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-----Original Message-----
From: emcoV10lathe@... [mailto:emcoV10lathe@...]On Behalf Of davedamouth
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If yours has been apart, is the headstock properly aligned?? In other
words, if you chuck up a 6" long chunk of 2" diameter steel and turn
it down slightly, does it have a taper?? The headstock alignment
method seems a bit lacking to me.? It doesn't seem to really nest
against the V ways well.? If the person who re-assembled it didn't
dial it in, it might be off quite a bit.