Clearance angle
Clearance angle is provided to avoid rubbing of the body of the tool with the work-piece
Headstock spindle
A faceplate is held at headstock spindle of lathe.
Changing the direction of rotation of the lead screw
Tumbler gear mechanism is used to change the direction of lead screw and feed rod in lathe machines. By Engaging tumbler gear, the carriage can be moved automatically from tailstock end to headstock
Just below the nose of the headstock spindle
Gap or extension-type lathes are similar to toolroom lathes except that gap lathes can be adjusted to machine larger diameter and longer workplaces The operator can increase the swing by moving the bed a distance from the headstock, which is usually one or two feet.
In a gap bed lathe, the gap is provided just below the nose of the headstock spindle.
Ball centre
Ball centre is sometimes used for tapering by the "set-over tail stock" method. The standard centres cannot sit squarely in the center hole when the tail stock is set over.
