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Cnc Lathes and Milling Machines
Entry Level Cnc Machine Tools at Affordable Prices.
Cnc Lathes, Cnc Milling Machines, Cnc Turret Mills.
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Entry Level Cnc Lathes and Milling Machines
Ems. Ltd. Machine Tools
Ems. Ltd. Machine Tools are now supplying new Gate Turret Milling Machines. A high quality, low priced machine which has a remarkably high specification for the money. Several are now in service in precision machine shops, colleges, and training authorities, throughout the UK and Overseas, with a high degree of customer satisfaction and repeat orders.
Entry level Cnc/Manual versions come with a choice of controls, Millpwr or Anilam for the Standard size Cnc Turret Mills or Anilam and Fagor for the larger models.
A range of very affordable Cnc Lathes is also available, and demonstrations of all machines are gladly arranged. For further details and enquiries:
Visit the website Ems. Ltd. Machine Tools or email mtools@btinternet.com
Types of metal lathes
There are many variants of lathes within the metalworking field. Some variations are not all that obvious, and others are more a niche area. For example, a centering lathe is a dual head machine where the work remains fixed and the heads move towards the workpiece and machine a center drill hole into each end. The resulting workpiece may then be used "between centers" in another operation. The usage of the term metal lathe may also be considered somewhat outdated these days, plastics and other composite materials are in wide use and with appropriate modifications, the same principles and techniques may be applied to their machining as that used for metal.
Center lathe
A center lathe or engine lathe may be considered the basis for the metal lathe and is the type most often used by the general machinist or hobbyist. The construction of a center lathe is detailed above, but depending on the year of manufacture, price range, or desired features, even these lathes can vary widely between models. For convenience, the center lathe may be considered a useful starting point.
Capstan lathe
A Capstan lathe is a production machine that combines the features of the basic lathe along with a capstan style tailstock. This tailstock has a short slide upon which sits the hexagonal capstan head. The main body is fixed to the bed in the required position and all longitudinal movement is via the short slide. The stroke of the capstan is short but the sequence can be rapid as the tooling indexes automatically at the end of the stroke. This indexing and movement is performed by turning a large levered handwheel as required.1
Turret lathe
A turret lathe is a production machine that that to all apearances is the same as the capstan, however the turret slides directly on the bed, there is no intermediate slide. Movement of the turret can therefore be anywhere along the bed.1
Multispindle lathe
Main article: screw machine
A multispindle lathe , commonly called a screw machine, is another production machine that is of high capacity. These machines may have up to 12 spindles that all operate simultaneously, each spindle will have its own tooling and the completion of one full cycle usually produces one part, although this depends on the number of operations required to produce the part. The sequence of events is programmed into the machine by adjusting stops, cams and levers and requires a highly skilled machine setter to perform the process efficiently. The setting and operation of the machine was quite often performed by different people.
Combination lathe
A combination lathe may introduce drilling or milling operations into the design of the lathe. These machines utilize the carriage and topslide as the x and y axis of the machine.
CNC lathe
CNC lathe with milling capabilities
An example turned vase and view of the tool turretCNC controlled lathes are rapidly replacing the older production lathes (multispindle, etc) due to their ease of setting and operation. They are designed to use modern carbide tooling and fully utilize modern processes. The part may be designed by the Computer-aided manufacturing (CAM) process, the resulting file uploaded to the machine, and once set and trialled the machine will continue to turn out parts under the occasional supervision of an operator. The machine is controlled electronically via a computer menu style interface, the program may be modified and displayed at the machine, along with a simulated view of the process. The setter/operator needs a high level of skill to perform the process, however the knowledge base is broader compared to the older production machines where intimate knowledge of each machine was considered essential. These machines are often set and operated by the same person, where the operator will supervise a small number of machines (cell).
The design of a CNC lathe has evolved yet again however the basic principles and parts are still recognisable, the turret holds the tools and indexes them as needed. The machines are totally enclosed, due in large part to Occupational health and safety (OH&S) issues.
Swiss style lathe
For work requiring extreme accuracy (sometimes holding tolerances as small as a few tenths of a thousandth of an inch), a swiss style lathe is often used. A swiss style lathe holds the workpiece with both a collet and a guide bushing. The collet sits behind the guide bushing, and the tools sit in front of the guide bushing, holding stationary on the Z axis. To cut lengthwise along the part, the tools will move in and the material itself will move back and forth along the Z axis. This allows all the work to be done on the material near the guide bushing where it's more rigid, making them ideal for working on slender workpieces as the part is held firmly with little chance of deflection or vibration occurring.
This style of lathe is also available with CNC controllers to further increase its versatility.
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