Posted in Milling Machine

Milling Attachments Used in Milling Machine

This title is given to attachments which provide a means of driving a rotating cutter other than the lathe mandrel. (Those which provide means of indexing the work relative to the headstock will be dealt with in chapter 6.) There are two basic types of “Attachment” – those which are normally carried on the saddle, so that the cutter can be moved relative to work held in the normal chuck; and those which are secured to the lathe bed,so that work on the cross-slide can be moved about beneath them. I call the first type “Milling Spindles” to distinguish them…

Posted in Milling Machine

Workholding Devices of Milling Machine

The usual objective of millilng is to produce flat surfaces. This means that a number of ottributes of the lathe, unimportant when turning, become prime considerations when milling. I have already referred to one- the fact that the lathe is deliberately built to turn concave on the faceplate by a very small amount. This means that a large radius flycutter will “interfere” on the  rearward part of  its revolution by. perhaps,0.001 inch or so. There are other reference planes. too. which should be checked. REFERENCE PLANES. Clearly, work must be set true in the vertical plane, but this normally presents no problem…

Posted in Milling Machine

Tooth Geometry, Speeds & Feeds and Cutter Holding

The majority of model engineers using the lathe for  milling  will  accept  the  tooth angles found on the cutter “as bought”, and as most which are stocked by tool dealers will be “general purpose” cutters there is little need to worry about them – though  some care may have to be exercised  when dealing with “surplus” tools, some of which may be specials, However, some knowledge of the necessary rakes  and clearances  is of value, both in diagnosing faults if anything goes wrong and when making cutters. Those who own a cutter-grinder will usually find setting details for the various types…

Posted in Milling Machine

Milling Cutters: Types of Cutter and Cutter Tooth

The action of the tooth of a milling cutter is quite different from that of a lathe tool. Fig. 1 shows   that.   with   the   normal rotation relative to the feed, the effective depth of cut is small at the first engagement of the tooth, rising to a maximum at the edge of the workpiece. There will be a sudden release of  energy as the  chip leaves  the   parent  metal  and  even   if another tooth has started  to cut further round  the  cutter  (as  it should,  if  good practice is being followed) there will be a marked “spring back” both of…

Posted in Milling Machine

Introduction to the Lathe as a Milling Machine

The lathe Is by far the most versatile of all machine tools. Though developed as a producer of “solids of revolution”. working between centres, the introduction of the headstock  – a  very  long time  ago  – rendered the production of flat surfaces possible and “surfacing” techniques are mentioned in almost every written record of  the lathe. When  turning  became  a leisure occupation – about 400 years ago so far as we know – the wish to apply decoration to plain turned work resulted in the development of a number of auxiliary devices. Some, like the “Rose Engine”, were effectively a different…

Posted in Lathe Machine

What is Capstan Lathe Machine, Application & Technical Specification

A capstan machine is a processing machine used to make the same parts again and again. The cutting bits are mounted on a rotatable turret known as a capstan, which permits the client to rapidly change the introduction of the bits for slicing without needing to take off the first bit and afterward mount the second. A bit of crude material, off and on again known as a clear, is mounted into the capstan machine and is then spun at high velocity. The cutting apparatuses, some of the time known as blades, are then used to slice into the clear…

Posted in Electrical Discharge Machine

Advantages and Disadvantages of the Die Sinking Electro-Discharge Machining (EDM) Process

When applying the EDM manufacturing process the workpiece is machined either “sunk” into a specific fluid or not, the fluid which covers the workpiece in the cutting area being a dielectric. The method which involves die-sinking uses a work table specifically made airtight (a sinking bath where the fluid is provided). The type of fluid most widely used is kerosene (petrol), distilled water or deionized water. This arrangement of the application of the EDM manufacturing process provides for the electrical discharge between the tool [electrode (-)] and the cathode (+), which in fact is the machined workpiece, to take place…

Posted in Drilling Machine

Drills and Drilling Machines

How a Drill Cuts Drilling is the operation most often performed on a drill press. Both rotating force and a downward pushing force are needed for drilling. Parts of a Twist Drill Clamping Work for Drilling Correct clamping technique. Note that clamp is parallel to work. Clamp slippage can be reduced by placing a piece of paper between the work and the clamp. Incorrect clamping technique. T-bolt is too far from work. This allows the clamp to spring under pressure. Sharpening a Drill Hold the point lightly against the rotating wheel and use three motions of the shank: to the…

Posted in Mechanical Engineering

Fluid Mechanics: Fluid Statics

“The goal in life is to be solid, whereas the way that life works is totally fluid, so you can never actually achieve that goal.”- Damien Hirst (British artist). Fluid mechanics is basically ΣF = d(mv/dt) (Newton’s 2nd Law, the sum of the forces is equal to the rate of change of momentum) applied to a fluid. What distinguishes a fluid from a solid is that a solid deforms only a finite amount due to an applied shear stress (unless it breaks), whereas the fluid continues to deform as long as the shear stress is applied. This makes fluid mechanics a lot more complicated (at…

Posted in Lathe Machine

Straight Turning Operation on Lathe Machine

Lathe machines are used to turn the work straight by making the work rotate about the lathe axis and by feeding the tool parallel to the lathe axis. In the straight turning procedure, a cylindrical surface is produced by the removal of excess metal from the work piece. The job is made to face the ends and drill at the centre and then mounted between the centers with the help of a lathe dog attached to the work piece. For this purpose, a properly ground right-hand turning tool is used. Basically, this tool is clamped on the tool post, ensuring…