Showing posts from October, 2015

Lathe Operations: Facing

Facing Operations Facing is the process of removing metal from the end of a workpiece to produce a flat surface. Most often, the workpiece is cylindrical, but using a 4-jaw chuck you can face rectangular or odd-shaped work to form cubes and other non-cylindrical shapes.

When a lathe cutting tool removes metal it applies considerable tangential (i.e. lateral or sideways) force to the workpiece. To safely perform a facing operation the end of the workpiece must be positioned close to the jaws of the chuck. The workpiece should not extend more than 2-3 times its diameter from the chuck jaws unless a steady rest is used to support the free end. Cutting Speeds

If you read many books on machining you will find a lot of information about the correct cutting speed for the movement of the cutting tool in relation to the workpiece. You must consider the rotational speed of the workpiece and the movement of the tool relative to the workpiece. Basically, the softer the metal the faster the cutting. D…

Installation Instructions for Taper Attachment on Lathe Machine

As there are innumerable variations in the design and construction of the engine lathes in use today, it is evident that no one accessory can be made to fit them all. So it is with taper attachments. Consequently, only very general instructions can be given, and these may have to be modified somewhat to fit a particular situation.
This particular taper attachment is designed primarily for use with a telescoping cross slide screw, but it can be used with the regular non-telescoping type screw, though not without considerable inconvenience.
Determine first if you have a telescoping cross slide screw. If there is no cross slide screw anchor block or bearing on the rear of the lathe saddle, you almost certainly have a lathe with a solid type screw, in which case it will need to be modified if it is to be used as a telescoping screw. If when the screw anchor block is removed, the screw seems free to slide when the cross slide is pushed or pulled, then your screw is telescoping. If the ero…

Definition and Classification of Taper Turning

In order to understand taper turning, first you have to understand the general meaning of TAPER.
Meaning of Taper

A gradualdecrease in thickness or width of an elongatedobject
Diminish or reduce in thickness towards one end
धीरे धीरे कम हो जाना
to become or cause to become narrower towards one end

Now you have a general idea what taper is. So, you can better understand the Taper Turning now.
Taper Turning
When the diameter of a piece changes uniformly, from one end to the other, the job is said to be tapered. Taper turning is a machining operation in which the gradual reduction in diameter from one part of a cylindrical workpiece to another part is carried out. There can be external or internal tapers. If a workpiece is tapered on the outside, it is known as external taper; if it is tapered on the inside, it is known as internal taper.
In a straight turning, the cutting tool moves along a line parallel to the axis of the work, causing the finished job to be the same diameter throughout.