开云体育

Stefan,
Could it be that the tail stock base is poorly machined in the v way area?
Mine was not machined with a good finish in the v way groove or on the flat way surface. I applied 120 grit wet-r-dry sandpaper to the way surfaces using double face tape and gently lapped the tail stock base to the ways. It did not take long to achieve a nice sliding fit. This solved my tail stock "positioning issue". It now repeats well. One issue that may result from lapping the tail stock base to the ways is that the tail stock may end up being low relative to the headstock, but if so this can be rectified by building in some type of vertical adjustment to get it back to zero. I also did the same thing to the carriage ways. You wouldn't believe how smooth my carriage operation is now that this is done. I also plan on doing the cross slide ways and compound ways in the same way. The payoff will be nice fitting slides which will translate into reduced chatter and nicer finishes.
I wish you the best of luck in solving your tail stock issues!
Dick