Toolholders and Toolholding for the Lathe MACH 118

Toolholders and Toolholding for the Lathe MACH 118: Lathe & Mill I Thaddeus Stevens College of Technology

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Introduction � For lathe work, cutting tools must be supported and fastened securely in the proper position to machine the workpiece. ◦ There are many different types of toolholders available to satisfy this need. � Anyone working with a lathe should be able to select the best toolholding device for the operation performed. Created by R. Schwartz 10/04/08

OBJECTIVES: � Identify standard, quick-change, and turret-type toolholders. � Identify toolholding for the lathe tailstock. Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Carriage � An important aspect of lathe toolholding is rigidity. ◦ If tool bits or inserts are not well supported or overhang is too great, vibration & tool chatter will often be the result. � Tool posts are mounted on the compound rest and held securely by a T-bolt. ◦ The most commonly used are the quick-change types, more versatile than the standard post. Fig. I-48 Quick-change tool post, dovetail type. Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Carriage � The tool post shown here uses double vees to locate the toolholders, which are clamped and released from the post by turning the top lever. Fig. I-49 Quick-change tool post. Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Carriage • The quick change tool post (Aloris) has replaced the now obsolete “rocker” type tool post. Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Carriage � Toolholders for the quickchange tool posts are made in many different varieties to accommodate various machining ops. Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Carriage �A boring bar toolholder in use; the boring bar is rigidly supported. Fig. I-54 Boring toolholder. This setup provides good boring bar rigidity (Aloris Tool Technology) Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Carriage �A cutoff tool mounted in a toolholder. Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Tailstock �A tailstock spindle used to hold Morse taper shank tools Fig. I-62 Taper shank drill with sleeve ready to insert in tailstock spindle. Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Tailstock • One of the most common toolholding devices used on a tailstock is the drill chuck – Used for holding straight shank drilling tools. Fig. I-63 Drill chuck with Morse taper shank Created by R. Schwartz 10/04/08

TOOLHOLDERS/TOOLHOLDING FOR THE LATHE Toolholding for the Lathe Tailstock � When a series of operations must be performed and repeated on several workpieces, a tailstock turret can be used. ◦ The tailstock turret shown has six tool positions. ◦ One is used as a workstop. ◦ The other positions are for center drilling, reaming, counterboring, and tapping. Fig. I-64 Tailstock turret. Created by R. Schwartz 10/04/08

REVIEW � Name two different types of toolposts used on engine lathes. � Which type of toolpost has become obsolete and is rarely used in industry? � State some advantages of the quick change toolpost. � What type of taper is found in the tailstock spindle? Created by R. Schwartz 10/04/08