OVERVIEW OF TURNING: Classified under manufacturing techniques, turning is the most widely used process and holds a vital place among material removal methods in the manufacturing industry. The main principle of the method is the removal of chips from a rotating workpiece through the movement of the body where stationary or rotary (live) tools are mounted. The place where the workpiece is connected or clamped is the collet. This is called the chuck. Lathe chucks can be 3-jaw or 4-jaw, as well as vise-type or faceplate chucks. In the industry, the term "jaw" is commonly used. The part of the lathe where the chuck is mounted is called the spindle. The spindle is rotated at a specific RPM; therefore, the chuck and the connected workpiece rotate with it. The drive for the spindle comes from the gearbox located right behind it. If the cylindrical material to be processed is long, a tailstock, which is a lathe element located directly opposite the spindle, is used. The tailstock serves to stabilize the workpiece between itself and the spindle, preventing oscillation caused by centrifugal force. Cutting tools and inserts are positioned very rigidly in the tool holder (kater) or turret located between the spindle and the tailstock. The chip removal process is performed by moving the tool back and forth toward the chuck, and up and down toward the center of the rotating workpiece.

GENERAL OVERVIEW: Lathe machines are generally machines that remove chips by rotating a horizontal or vertical spindle and its connected workpiece, while the cutting insert in the tool holder or turret approaches the material from the face or surface in the X and Z axis directions. Lathes were first produced as universal models and later began to be manufactured as CNC lathes with the adaptation of CNC control units that enable fully automatic operation. The transition from universal lathes to CNC lathes did not happen instantly. Generally, we can classify lathes as follows:

• Watchmaker lathes

• Benchtop lathes (Hobby type lathes)

• Universal lathe machines

• Hydraulically controlled lathes

• Electronically controlled lathes

• Air lathes

• Copy lathes

• Turret lathes

• Numerical Control or simply NC lathes

• CNC lathes (Computer Numerical Control)

MAIN OPERATIONS PERFORMED ON LATHES: Different operations can be performed based on the targeted geometry of the workpiece.

• Facing operation: The process of cutting or chip removal through the movement of the cutting tool perpendicular to the workpiece axis.

• Longitudinal (cylindrical) turning operation: Removing chips from the surface parallel to the workpiece axis. The tool feed rate is constant.

• Taper turning operation: Shaping the material by approaching and moving the cutting insert at a specific angle to the workpiece axis.

• Profile turning operation: Removing excess material by moving a tool prepared in a specific profile perpendicular to the material.

• Grooving operation: A similar process to facing. The tool advances perpendicularly from the outer surface of the workpiece toward the center, removing a certain amount of material.

• Threading operation: The process of removing chips with a specific and suitable cutting tool, moving perpendicularly for depth and moving in a parallel feed motion suitable for the lead/pitch.

• Reaming operation: A precision-enhancing process used to improve the surface roughness of holes previously opened with a drill bit.

• Drilling operation: Removing chips from the workpiece by mounting a drill bit to the tool holder or turret.

• Boring operation: A process performed with a tool larger than the diameter of the existing hole to enlarge it.

EFFICIENCY IN TURNING PROCESSES: To achieve the best results from lathe machines, there are certain cutting parameters to consider. These are cutting speed, feed rate, and depth of cut. In addition to these three parameters, selecting the most suitable cutting tools based on the material structure is another important factor affecting surface precision and work efficiency. Besides the choice of cutting inserts, the cutting fluid used to remove chips from between the insert and the surface during cutting is another factor affecting surface quality. Cutting fluid not only removes the chips from the processing area but also helps reduce the heat generated by friction during cutting. It prevents tool wear and extends tool life. Therefore, the properties and selection of the cutting fluid used are extremely important and directly affect efficiency.

On our Karaport machine trading site, under the relevant category, there are listings, descriptions, photos, and prices for pre-owned and new lathes from machinery dealers and pre-owned lathes for sale from direct owners.