PRESIDENT UNIVERSITY Fundamentals of Turning Herwan Yusmira Industrial Engineering PRESIDENT UNIVERSITY Classification of Lathe
(a) According to configuration Horizontal - Most common for ergonomic conveniences Vertical - Occupies less floor space, only some large lathes are of this type. (b) According to purpose of use General purpose - Very versatile where almost all possible types of operations are carried out on wide ranges of size, shape and materials of jobs; example : centre lathes Single purpose - Only one (occasionally two) type of operation is done on limited ranges of size and material of jobs; example facing lathe, roll turning lathe etc.
Special purpose - Where a definite number and type of operations are done repeatedly over long time on a specific type of blank; example: gear blank machining lathe etc. Examples of Turning processes. PRESIDENT UNIVERSITY Classification of Lathe (c) According to size or capacity
Small (low duty) - In such light duty lathes (up to 1.1 kW), only small and medium size jobs of generally soft and easily machinable materials are machined Medium (medium duty) - These lathes of power nearly up to 11 kW are most versatile and commonly used Large (heavy duty) Mini or micro lathe - These are tiny table-top lathes used for extremely small size jobs and precision work; example: Swiss type automatic lathe (d) According to degree of automation Non-automatic - Almost all the handling operations are done manually; example: centre lathes
Semi-automatic - Nearly half of the handling operations, irrespective of the processing operations, are done automatically and rest manually; example: capstan lathe, turret lathe, copying lathe relieving lathe, etc. Automatic - Almost all the handling operations (and obviously all the processing operations) are done automatically; example single spindle automat (automatic lathe), swiss type automatic lathe, etc. PRESIDENT UNIVERSITY
Classification of Lathe (e) According to type of automation Fixed automation - Conventional; example single spindle automat, Swiss type automatic lathe, etc. Flexible automation - Modern; example CNC lathe, turning centre, etc. (f) According to configuration of the jobs being handled Bar type - Slender rod like jobs being held in collets Chucking type - Disc type jobs being held in chucks
Housing type - Odd shape jobs, being held in face plate PRESIDENT UNIVERSITY Classification of Lathe (g) According to precision Ordinary Precision (lathes) - These sophisticated lathes meant for high accuracy and finish and are relatively more
expensive. (h) According to number of spindles Single spindle - Common Multispindle (2, 4, 6 or 8 spindles) - Such uncommon lathes are suitably used for fast and mass production of small size and simple shaped jobs. PRESIDENT UNIVERSITY Principle of Turning
Examples of Turning processes. PRESIDENT UNIVERSITY Schematic Lathe Schematic diagram of a centre lathe. . PRESIDENT UNIVERSITY
Schematic Lathe Schematic diagram of a centre lathe. . PRESIDENT UNIVERSITY Pictorial view Pictorial view of a capstan lathe .
PRESIDENT UNIVERSITY Pictorial view of turret Lathe Pictorial view of a Turret lathe . PRESIDENT UNIVERSITY Single spindle automatic lathe
The general purpose single spindle automatic lathes are widely used for quantity or mass production (by machining) of high quality fasteners; bolts, screws, studs etc., bushings, pins, shafts, rollers, handles and similar small metallic parts from long bars or tubes of regular section and also often from separate small blanks. PRESIDENT UNIVERSITY Parts Mounting devices Chuck of the lathe .
PRESIDENT UNIVERSITY Parts Mounting devices Mounting of odd shaped jobs on face plate in centre lathe. Universal plate (a) Part directly clamped on the face plate (b), or used fixture as in c. PRESIDENT UNIVERSITY
Parts Mounting devices Mounting of part between centers by using lathe dog. PRESIDENT UNIVERSITY Parts Mounting devices PRESIDENT UNIVERSITY
Parts Mounting devices Slender part held with extra support by steady rest PRESIDENT UNIVERSITY Cutting tools Mounting devices PRESIDENT UNIVERSITY
Various cutting operation in lathe turning Facing Grooving Forming External
Internal Some common machining operations done in center lathes Threading PRESIDENT UNIVERSITY Machining Operations Usually Done In Lathes The machining operations generally carried out in centre lathes are:
Facing Centering Rough and finish turning Chamfering, shouldering, grooving, recessing etc Axial drilling and reaming by holding the cutting tool in the tailstock barrel Taper turning by offsetting the tailstock swivelling the compound slide using form tool with taper over short length using taper turning attachment if available combining longitudinal feed and cross feed, if feasible. Boring (internal turning); straight and taper
Forming; external and internal Cutting helical threads; external and internal Parting off Knurling PRESIDENT UNIVERSITY EXERCISES 1. How much machining time will be required to reduce the diameter of a cast iron rod from 120 mm
to 116 mm over a length of 100 mm by turning using a carbide insert. 2. Determine the time that will be required to drill a blind hole of diameter 25 mm and depth 40 mm in a mild steel solid block by a HSS drill of having a cone tip of 2 mm. 21
Due at the end of the period! Seven days a week, Paul ventures onto the subway with his clarinet. The park was visited by all of the local families, and it was loved by all of the community's children. The...
Advanced Placement English Language and Composition . Exam Hints and Information. ... Practice grading on AP scale. Objective Section. About 50-60 questions. ... Advanced Placement English Language and Composition Exam PowerPoint
The Atwood Machine Formal Lab Report Atwood's Machine The purpose of this laboratory exercise is to investigate the validity of Newton's Second Law of Motion. You will use a single pulley apparatus as shown. This apparatus is commonly referred to...
A Tour of the Digestive System . The Digestive Process - Mouth. a. The entrance- inside the mouth. When your body gets ready to eat, it will increase the production of saliva, or . spit. Saliva plays an important role...
Sensory Imagery. Sensory imagery involves evoking the different senses in you reader through the use of descriptive sentences. Touch SoundSmell. SightTaste. Example: The salty tang of the fresh sea water stunned her as she was sucked beneath the lip of...
There had been various efforts to fund and build a transcontinental rail line since the early 1850s, but the monumental cost and difficulty of construction, and the onset of the Civil War delayed the project. In 1862, Congress passed the...
FINDINI 4.0.9 Release Summary. Objective: This release will be focused on integrating the new Concur Travel and Entertainment Expense system with the Oracle GL & PeopleSoft, upgrading the CPATH application to a more current version, upgrading the OBI Replication database...
30% of respondents would like to work as a portfolio GP. Three in ten GPs described being a salaried GP as a positive career choice. From the BMA 2017 Sessional GP Survey. 2,079 responses. Looking forward over five years, most...
Ready to download the document? Go ahead and hit continue!