I'm working on the cross slide on a 1971 SB13. Not surprisingly on a 50-year-old machine, somebody has worked on this mechanism before me. My lathe has the late model version cross slide screw with 2 bearings. However, when I disassembled the cross slide I found 1 bearing and 1 solid shim taking the place of the second bearing. I did find a replacement bearing and seem to have the shaft assembled correctly now, so that's not my problem. I just mention it so you understand that additional "modifications" could have been made since the lathe left the South Bend factory.
The problem I'm having is to do with the "C. F. Bushing" (part #PT63T3). This is the housing that the crossfeed shaft runs through, and it screws directly into the Saddle. It also happens to be the part that has the "0" mark which is the index for the crossfeed dial. When I screw the C. F. Bushing fully into the Saddle the "0" index mark comes right up on top where you would expect. What's confusing me is there is a hole cross drilled through the C. F. Bushing that looks to me like it should line up with the hole in the Saddle marked "oil". This is one of those tiny little oil ports that is normally plugged up by a 1/4-20 set screw. It looks to me like that hole was drilled in the bushing so that oil will get inside and lubricate the shaft. Otherwise, it seems like any oil you put in that hole really can't go anywhere. Anyway, the problem is that the hole in the C. F. Bushing ends up 90 degrees from the hole in the Saddle. It seems wrong, but I have a hard time believing that SB drilled the hole incorrectly 50 years ago, and I'm the first guy who has discovered it. It seems much more likely that I'm misunderstanding something about the situation and the parts are made and drilled correctly. If it weren't for the "0" index lining up as expected, I might just put a little shim on the C. F. Bushing so it tightens up at a point where the holes align, but with the index mark aligning correctly, I have to think that the C. F. Bushing must be threading in the expected amount. I wonder if anybody on the forum has an idea what I a doing wrong or thinking wrong here?
The problem I'm having is to do with the "C. F. Bushing" (part #PT63T3). This is the housing that the crossfeed shaft runs through, and it screws directly into the Saddle. It also happens to be the part that has the "0" mark which is the index for the crossfeed dial. When I screw the C. F. Bushing fully into the Saddle the "0" index mark comes right up on top where you would expect. What's confusing me is there is a hole cross drilled through the C. F. Bushing that looks to me like it should line up with the hole in the Saddle marked "oil". This is one of those tiny little oil ports that is normally plugged up by a 1/4-20 set screw. It looks to me like that hole was drilled in the bushing so that oil will get inside and lubricate the shaft. Otherwise, it seems like any oil you put in that hole really can't go anywhere. Anyway, the problem is that the hole in the C. F. Bushing ends up 90 degrees from the hole in the Saddle. It seems wrong, but I have a hard time believing that SB drilled the hole incorrectly 50 years ago, and I'm the first guy who has discovered it. It seems much more likely that I'm misunderstanding something about the situation and the parts are made and drilled correctly. If it weren't for the "0" index lining up as expected, I might just put a little shim on the C. F. Bushing so it tightens up at a point where the holes align, but with the index mark aligning correctly, I have to think that the C. F. Bushing must be threading in the expected amount. I wonder if anybody on the forum has an idea what I a doing wrong or thinking wrong here?