Table of Contents
What are the main factors which affect the lathe operation?
Cutting speed and feed determines the surface finish, power requirements, and material removal rate. The primary factor in choosing feed and speed is the material to be cut. However, one should also consider material of the tool, rigidity of the workpiece, size and condition of the lathe, and depth of cut.
Is a lathe operation which are also commonly called recessing undercutting or necking?
Parting and Grooving on a Lathe Grooving, commonly called recessing, undercutting, or necking, is often done at the end of a thread to permit full travel of the nut up to a shoulder or at the edge of a shoulder to ensure a proper fit of mating parts.
What are the operations that can be performed on lathe?
The most common lathe operations are turning, facing, grooving, parting, threading, drilling, boring, knurling, and tapping.
What are the things that you should do to avoid hazard and accident in using lathe?
What are some things you should avoid doing?
- Do not wear gloves, rings, watches or loose clothing.
- Do not lean on machine.
- Do not make adjustments while the machine is operating.
- Do not place hands on work turning in the lathe.
- Do not use calipers or gauges on a workpiece while machine is moving.
When operating lathe machines describe how entanglement hazard happens?
Entanglement is when a person becomes pinched, crushed, or wrapped in any part of a machine. Machines pose a hazard of entanglement when they have any of the following points: Pinch Points occur where two or more parts are moving together, one of which is moving in a circle.
Why tools fail during cutting?
Mechanical breakage occurs due to excessive forces & shocks, which directly damage cutting edges of tool. Plastic deformation occurs due to high stresses & higher temperature. Hence the tool material looses its hardness & plastic deformation occurs. Wear failure occurs due to wearing of flank & rake surface of too.
What are important factors that affect cutting?
The factors are: 1. Velocity 2. Size of Cut 3. Tool Geometry 4.
What is undercutting in lathe?
In manufacturing, an undercut is a special type of recessed surface that is inaccessible using a straight tool. In turning, it refers to a recess in a diameter generally on the inside diameter of the part. In milling, it refers to a feature which is not visible when the part is viewed from the spindle.
Why is undercut needed?
On turned parts an undercut is also known as a neck or “relief groove”. They are often used at the end of the threaded portion of a shaft or screw to provide clearance for the cutting tool, and also referred to as thread relief in this context.
What is turning operation in lathe machine?
Turning is the removal of metal from the outer diameter of a rotating cylindrical workpiece. Turning is used to reduce the diameter of the workpiece, usually to a specified dimension, and to produce a smooth finish on the metal. Often the workpiece will be turned so that adjacent sections have different diameters.
What are the most common causes of accident in a machine shop?
Poorly maintained and nonexistent guards are among the most common issues related to machine-shop injuries, often resulting in some of the most horrific accidents. Improper machine guarding has been in OSHA’s Top Ten Most Cited Violations list for the past six years, including in 2019.
What is the most common injury caused by working with machines?
The most common injury caused by using a machine unsafely is laceration.
What is crushing hazard?
Crushing accidents occur when the body or any part of the body is squeezed between two moving objects or caught between one moving and one stationary object. Minor crushing accidents can cost workers in many ways, in pain, disability, and the loss of a job. Major crushing accidents can even cost a life.
What type of hazard is cuts and crushes?
Potential injuries from shear or cutting point hazards include amputation, lacerations, contusions, crushing of tissue, and broken bones. Due to the speed of mechanical parts, injury is inevitable when a body part comes in contact with a shear or cutting point.
What are the causes of tool damage?
Thermal cracks
- Flank wear. Causes. The flank face is always in contact with the workpiece, therefore the rubbing between the two causes flank wear.
- Built-up edge. Causes.
- Fracture. Causes.
- Chipping. Causes.
- Breakage. Causes.
- Flaking (Spalling) Causes.
- Welding. Causes.
- Plastic deformation. Causes.
What are the three modes of tool failure?
The three tool failure modes are (1) fracture failure, (2) temperature failure, and (3) gradual wear.
What can affect cutting speed?
In general, factors affecting the calculation of cutting speed include (1) the material being machined (steel, brass, tool steel, plastic, wood), (2) the material the cutter is made from (carbon steel, high-speed steel, carbide, ceramics), and (3) the economical life of the cutter; that is, the cost to regrind or …
What is undercut operation?
What is the purpose of undercut in machining?
What is a lathe cut operation?
It is an operation of reducing the length of the workpiece by feeding the perpendicular to the lathe axis. This operation of reducing a flat surface on the end of the workpiece. For this operation, regular turning tool or facing tool may use. The cutting edge of the tool should set to the same height as the centre of the workpiece.
What is undercutting on a lathe?
In a lathe, the work is mounted on a chuck or on a faceplate and revolved at a very slow speed. A tap of the required size held on a special fixture is mounted on the tailstock spindle. Undercutting is similar to a grooving operation when performed inside a hole.
What are the types of lathe machine operations?
Lathe Machine Operations. The lathe machine operations are classified into three main categories. Lathe machine operations done either by holding the workpiece between centres or by a chuck are: Turning Plain or Straight Turning.
Can a lathe drill produce a hole?
It cannot produce a hole. Boring is similar to the external turning operation and can be performed in a lathe. In this operation, the workpiece is revolved in a chuck or a faceplate and the tools which are fitted to the tool post is fed into the work.