Ever green machines

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Ever green machines

  1. 1. CNC big bore lathe and PVC pipe threading machineIn its simplest form the carriage holds the tool bit and moves it longitudinally (turning) orperpendicularly (facing) under the control of the operator. The operator moves the carriage manuallyvia the handwheel (5a) or automatically by engaging the feed shaft with the carriage feedmechanism (5c).CNC big bore lathe provides some relief for the operator as the movement of the carriage becomespower assisted. The handwheels (2a, 3b, 5a) on the carriage and its related slides are usuallycalibrated, both for ease of use and to assist in making reproducible cuts. Calibration marks willmeasure either the distance from center (radius), or the work pieces diameter, so for example, on adiameter machine where calibration marks are in thousandths of an inch, the radial handwheel dialwill read .0005 inches of radius per division, or .001 inches of diameter. The carriage typicallycomprises a top casting, known as the saddle, and a side casting, known as the apronA secondary operation is a machining operation requiring a partially completed part to be secured ina second machine to complete the manufacturing process. Generally, advanced CAD/CAM softwareuses live tools in addition to the main spindles so that most parts that can be drawn by a CADsystem can actually be manufactured by the machines that the CAD/CAM software support.Carbides pvc pipe threading machine tolerate much higher machining speeds without wearing.This has led to machining times shortening, and therefore production growing. The demand forfaster and more powerful lathes controlled the direction of lathe development.A metal lathe or metalworking lathe is a large class of lathes designed forprecisely machining relatively hard materials. They were originally designed to machine metals;however, with the advent of plastics and other materials, and with their inherent versatility, they areused in a wide range of applications, and a broad range of materials. In machining jargon, where thelarger context is already understood, they are usually simply calledlathes, or else referred to bymore-specific subtype names (toolroom lathe, turret lathe, etc.). Pvc pipe threadingmachine remove material from a rotatingworkpiece via the (typically linear) movements of variouscutting tools, such as tool bits and drill bits.The availability of inexpensive electronics has again changed the way speed control may be appliedby allowing continuously variable motor speed from the maximum down to almost zero RPM. Thishad been tried in the late 19th century but was not found satisfactory at the time. Subsequentimprovements in electric circuitry have made it viable again.www.evgreenindia.com/CNC-big-bore-pvc-pipe-threading.html
  2. 2. CNC Lathe ManufacturersA lathe is a machine tool used principally for shaping pieces of metal, wood, or other materials bycausing the workpiece to be held and rotated by the lathe while a tool bit is advanced into the workcausing the cutting action. Lathes can be divided into three types for easy identification: enginelathe, turret lathe, and special purpose lathes. Some smaller ones are bench mounted and semi-portable. The larger lathes are floor mounted and may require special transportation if they must bemoved. Field and maintenance shops generally use a lathe that can be adapted to many operationsand that is not too large to be moved from one work site to another. The engine lathe is ideally suitedfor this purpose. A trained operator can accomplish more machining jobs with the engine lathe thanwith any other machine tool. Turret lathes and special purpose lathes are usually used in productionor job shops for mass production or specialized parts, while basic engine lathes are usually used forany type of lathe work.Additionally, as many Swiss lathes incorporate a secondary spindle, or sub-spindle, they alsoincorporate cnc lathe manufacturers. Live tools are rotary cutting tools that are powered by asmall motor independently of the spindle motor(s). Live tools increase the intricacy of componentsthat can be manufactured by the Swiss lathe. For instance, automatically producing a part with ahole drilled perpendicular to the main axis (the axis of rotation of the spindles) is very economical
  3. 3. with live tooling, and similarly uneconomical if done as a secondary operation after machining by theSwiss lathe is complete. A secondary operation is a machining operation requiring a partiallycompleted part to be secured in a second machine to complete the manufacturing process.Generally, advanced CAD/CAM software uses live tools in addition to the main spindles so that mostparts that can be drawn by a CAD system can actually be manufactured by the machines that theCAD/CAM software support.When turning, a piece of relatively rigid material (such as wood, metal, plastic, or stone) is rotatedand a cutting tool is traversed along 1, 2, or 3 axes of motion to produce precise diameters anddepths. Turning can be either on the outside of the cylinder or on the inside (also known as boring)to produce tubular components to various geometries. Although now quite rare, early lathes couldeven be used to produce complex geometric figures, even the platonic solids; although since theadvent of CNC it has become unusual to use non-computerized toolpath control for this purpose.Hard turning is a turning done on materials with cnc lathe manufacturers a Rockwell C hardnessgreater than 45. It is typically performed after the workpiece is heat treated.[3]The process is intended to replace or limit traditional grinding operations. Hard turning, when appliedfor purely stock removal purposes, competes favorably with rough grinding. However, when it isapplied for finishing where form and dimension are critical, grinding is superior. Grinding produceshigher dimensional accuracy of roundness and cylindricity. In addition, polished surface finishes ofRz=0.3-0.8z cannot be achieved with hard turning alone. Hard turning is appropriate for partsrequiring roundness accuracy of 0.5-12 micrometres, and/or surface roughness of Rz 0.8–7.0micrometres. It is used for gears, injection pump components, hydraulic components, among otherapplications.[3]Turning can be done manually, in a traditional form of lathe, which frequently requires continuoussupervision by the operator, or by using an automated lathe which does not. Today the mostcommon type of such automation is computer numerical control, better known as cnc lathemanufacturers. (CNC is also commonly used with many other types of machining besides turning.)www.evgreenindia.com/cnc-lathe-optima_series.htmlCNC Machine Retrofitting and CNC Retrofitting ServicesPrincipally retrofitting describes the measures taken in the manufacturing industry to allow new orupdated parts to be fitted to old or outdated assemblies (like blades to wind turbines).The production of retrofit parts is necessary in manufacture when the design of a large assembly ischanged or revised. If, after the changes have been implemented, a customer (with an old version ofthe product) wishes to purchase a replacement part then retrofit parts and assembling techniqueswill have to be used so that the revised parts will fit suitably onto the older assembly.
  4. 4. Another example of this is Cnc machine retrofitting, where older vehicles are fitted with newtechnologies: power windows, cruise control, remote keyless systems, electric fuel pumps, etc.The term is also used in the field of environmental engineering, particularly todescribe construction or renovation projects on previously built sites, to improve water quality innearby streams, rivers or lakes. The concept has also been applied to changing the output mixof energy from power plants to cogeneration in urban areas with a potential for district heating.Sites with extensive impervious surfaces (such as parking lots and rooftops) can generate highlevels of stormwater runoff during rainstorms, and this can damage nearby water bodies. Theseproblems can often be addressed by installing new stormwater management features on the site, aprocess that practitioners refer to as stormwater retrofitting. Stormwater management practices usedin retrofit projects include rain gardens, permeable paving and green roofs.Additionally, as many Swiss lathes incorporate a secondary spindle, or sub-spindle, they alsoincorporate cnc retrofitting services. Live tools are rotary cutting tools that are powered by a smallmotor independently of the spindle motor(s). Live tools increase the intricacy of components that canbe manufactured by the Swiss lathe. For instance, automatically producing a part with a hole drilledperpendicular to the main axis (the axis of rotation of the spindles) is very economical with livetooling, and similarly uneconomical if done as a secondary operation after machining by the Swisslathe is complete. A secondary operation is a machining operation requiring a partially completedpart to be secured in a second machine to complete the manufacturing process. Generally,advanced CAD/CAM software uses live tools in addition to the main spindles so that most parts thatcan be drawn by a CAD system can actually be manufactured by the machines that the CAD/CAMsoftware support.When turning, a piece of relatively rigid material (such as wood, metal, plastic, or stone) is rotatedand a cutting tool is traversed along 1, 2, or 3 axes of motion to produce precise diameters anddepths. Turning can be either on the outside of the cylinder or on the inside (also known as boring)
  5. 5. to produce tubular components to various geometries. Although now quite rare, early lathes couldeven be used to produce complex geometric figures, even the platonic solids; although since theadvent of CNC it has become unusual to use non-computerized toolpath control for this purpose.www.evgreenindia.com/cnc-machine-retrofitting.htmlGear Hobbing Machine and Polygon Turning MachineLathes are used in woodturning, metalworking, metal spinning, Thermal spraying/ parts reclamation,and glass-working. Lathes can be used to shape pottery, the best-known design being the potterswheel. Most suitably equipped metalworking lathes can also be used to produce most solids ofrevolution, plane surfaces and screw threads or helices. Ornamental lathes can produce three-dimensional solids of incredible complexity. The material can be held in place by either one ortwocenters, at least one of which can be moved horizontally to accommodate varying materiallengths. Other work-holding methods include clamping the work about the axis of rotation using achuck or collet, or to a faceplate, using clamps or dogs.For a gear hobbing machine which is a theoretical involute, the fundamental rack is straight-sided,with sides inclined at the pressure angle of the tooth form, with flat top and bottom. Thenecessary addendum correction to allow the use of small-numbered pinions can either be obtainedby suitable modification of this rack to a cycloidal form at the tips, or by hobbing at other than thetheoretical pitch circle diameter. Since the gear ratio between hob and blank is fixed, the resultinggear will have the correct pitch on the pitch circle, but the tooth thickness will not be equal to thespace width.Most hobs are single-thread hobs, but double-, and triple-thread hobs increase production rates. Thedownside is that they are not as accurate as single-thread hobs.[9] Depending on type of gear teethto be cut, there are custom made hobs and general purpose hobs. Custom made hobs are differentfrom other hobs as they are suited to make gears with modified tooth profile. The tooth profile ismodified to add strength and reduce size and noise of gears.
  6. 6. In addition to the spindle and its bearings, the headstock often contains parts to convert the motorspeed into various spindle speeds. Various types of polygon turning machinemechanism achieve this, from a cone pulley or step pulley, to a cone pulley with back gear (which isessentially a low range, similar in net effect to the two-speed rear of a truck), to an entire gear trainsimilar to that of a manual-shift auto transmission. Some motors have electronic rheostat-type speedcontrols, which obviates cone pulleys or gears.In addition to the spindle and its bearings, the headstock often contains parts to convert the motorspeed into various spindle speeds. Various types ofspeed-changing mechanism achieve this, from acone pulley or step pulley, to a cone pulley with back gear (which is essentially a low range, similarin net effect to the two-speed rear of a truck), to an entire gear train similar to that of a manual-shiftauto transmission. Some motors have electronic rheostat-type speed controls, which obviates conepulleys or gears.Hobbing is a machining process for making gears, splines, and sprockets on a hobbing machine,which is a special type of milling machine. gear hobbing machine or splines are progressively cutinto the workpiece by a series of cuts made by a cutting tool called a hob. Compared to other gearforming processes it is relatively inexpensive but still quite accurate, thus it is used for a broad rangeof parts and quantities.www.evgreenindia.com/gear-hobbing-polygon-turning.html

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