SB 9 cross slide threaded holes depth

martik777

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Apr 19, 2011
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Could someone tell me the depth of the two 5/16 threaded holes on top of the cross slide? My lathe does not have them and I would like to drill and tap them but not sure if I should go all the way through the casting (.660") as it may weaken it. I don't really have much choice right now as I do not have a bottom 5/16 tap.
 
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