Tag Archives: bearing

Lathe: Lead Screw

The lead screw provides automatic feed and makes thread cutting possible. It is a precision-threaded shaft, driven by gears as the headstock turns. It passes through the front of the carriage apron and is supported at the tailstock end by a bearing bracket.  Controls in the apron engage a lead nut to drive the carriage as the lead screw turns. Continue reading

Lathe: Tailstock

  1. The tailstock supports long work that would otherwise sag or flex too much to allow for accurate machining. Without a tailstock, long pieces cannot be turned straight and will invariably have a taper. Some tailstocks can be intentionally misaligned to accurately cut a taper if needed. The tailstock has a centering device pressed into a shallow, specially ed hole in the end of the work piece.
  2. The center can be either “live” or “dead.” Live centers have a bearing, allowing the center to rotate along with the work piece. Dead centers do not rotate and must be lubricated to prevent overheating due to with the work piece. Instead of a center, a drill can be mounted in the tailstock.
  1. Continue reading