Lathe Conversion to CNC -2 and Wall Smashers
After removing most of the lathe gear which will not be required after the CNC conversion, the lathe is looking a bit naked.
The carriage apron, the lead screw, the back gears, the drive rod and control rods have all been removed. Also the cross slide screw and handle. The cross slide itself is temporarily removed, but available for measuring for fitting a ball screw.
I have now made accurate measurements and drawings of the lathe bed and carriage, in order to choose ball screws and nuts for the lead screw and cross slide.
The lead ball screw is easy. There is plenty of room and machined surfaces for attachment. I see no particular problems there. Just time, careful machining and expense. Chinese or Euro-American? As usual, there is a big price difference and maybe not such a big quality difference as previously. Looking at 25 or 32mm diameter, with 550-600mm of thread.
The cross slide ball screw is another matter. The current cross slide square thread screw is 14mm diameter, and I would like to use a ball screw about the same size. The problem is that a ball screw nut is considerably bulkier than the existing square thread nut, so some machining of the cross slide will be required to make space. The cross slide dimensions are already fairly tight, to maximise the swing over the carriage. I do not want to weaken the cross slide too much. So it is all a bit tricky. Time to consider options. And to get another opinion.
No lathe pics, so here are some of Turkish wall smashers.