The sr38b, 10axis swisstype automatic lathe is the latest addition to the star cnc product line and sets a new standard for machining complex, large diameter parts with high operation efficiency. Eccentric turning is one when a work is turned not on the normal center axis, instead it is done at an offset as per the requirement. Using spindlesynchronised offsets to the xaxis to turn a noncircular profile on a 7x14 lathe cnc conversion. Eccentric turning on a lathe refers to the turning off the center or not on the normal center axis, it can be done on 3 jaw selfcentering chuck or 4 jaw chuck in different situations, the 4 jaw chuck with independently moved jaws allows parts to be moved offcenter. Lathe machine performs the different operations such as turning, facing, taper turning, knurling, grooving, parting off, thread cutting, reaming etc.
Usually, general purpose lathe will have a three jaw chuck which will take care regular turning. As in turning on a lathe with the workpiece not concentric with the spindle axis. I need to turn or bore an eccentric sleeve on my cnc lathe. Using 3d printing to make a bushing for eccentric turning a fly cutter in a 3 jaw chuck in a lathe, turned on my atlas lathe and 3d printed with.
Learn all about high speed cnc turning with feature rich cnc lathe from fanuc america read. The stroke motion required to generate the eccentric contour must be superimposed on the motion of the real x axis. Oct 11, 2018 eccentric turning on a lathe is anything that is not centered. Cnc programming example with fanuc g71 rough turning cycle. The syntax alarm only showed up with the statement xsinvapac. Specialty woodturning chucks for eccentric turning and re. When the throw is too small to allow all centers to fit into the end of a workpiece at the same time. The offset is calculated by a custom hal component and is then added on in the emc2. The crescent shape locates against the head of a locking screw which prevents the shaft from turning.
Lathe used for attempts of machining was equipped with cnc control system fanuc 35i with enabled possibility of making a path table operations pto what was supposed to make eccentric threads turning possible 67. Eccentric turning as in turning on a lathe with the workpiece not concentric with the spindle axis. Eccentric turning with two chucks 030215 this project required a crescentshaped recess machined into the end of a threaded shaft. In my opinion, a cnc lathe just strictly does turning. This process describes the making of a simple eccentric with a diameter of 22mm and a throw of 5mm. Concentric and eccentric complete machining in a single clamping setup.
This is pretty much essential to avoid any errors due to misalignment of the contact point. A lathe machine is a machine tool that is used to remove metals from a workpiece to give a desired shape and size. We accept cnc turning in hanoi, nationwide with single products, design orders, fabrication on demand, mass product processing, large quantities according to customer drawings. Gadgets and gizmos eccentric turning for crank pin with. Eccentric turning on the lathe is used for the following eccentric turning situations. Swisstype automatic lathe cnc machines new york star cnc. If you have a vdi turret without a yaxis you will need to move the wedge or spindle to find centerline because the toolholders are not adjustable if you have a bot turret without a yaxis you can adjust the toolholder by doing the following if the concenticity exceeded 0. Actually, i turned the cylinder to size on the lathe, after drilling the centres on the mill. It was machined from a piece of steel bar using just the 3. Cnc is also commonly used with many other types of machining besides. See more ideas about eccentric, variables and wood turning. Oct 22, 2017 the main difference between turning and eccentric turning is the centre of rotation of the workpiece.
The top countries of supplier is china, from which the percentage of eccentric turning on lathe supply is 100% respectively. Usually, general purpose lathe will have a three jaw chuck which will take care regular turning operations. Cnc turning solutions from fanuc america will cut costs by increasing productivity. What is eccentric turning how to do eccentric turning on. It was machined from a piece of steel bar using just the 3 jaw chuck on the lathe. Turning machine for eccentric 3tpd50 ponar wafum lathe ebay. I am trying to turn a teardrop or lobe shape on a home built cnc lathe. The eccentric is turned from bar stock with concentric journal next to the eccentric one. Aug 07, 2010 using spindlesynchronised offsets to the xaxis to turn a noncircular profile on a 7x14 lathe cnc conversion.
To solve some special problems in equipment running, eccentric parts and eccentric turning methods are becoming more and more important, and many people searching for how to do eccentric turning on the cnc lathe. Cnc cut, accurate, precise, lathe chuck, bowl chuck, popul see more. Gadgets and gizmos eccentric turning for crank pin with 4 jaw. Eccentric work on the lathe smithy detroit machine tools. This carbide lathe knife eliminates the need for frequent sharpening which is very common in lathe turning woodworking. A wide variety of eccentric turning on lathe options are available to you, there are 30 suppliers who sells eccentric turning on lathe on, mainly located in asia. Eccentric turning on lb 300 hi all, we are about to take delivery of an lb 300bmyc and have a job coming up, a camshaft of sorts that requires 4 different eccentric diameters roughly 2 50mm diameters turned on a 1 shaft, both ends being concentric. If you have a machine with a yaxis, go to procedure lathe yaxis toolholder to spindle centerline chc. It all depends on whether the cnc lathe has a milling spindle. An engine crankshaft is the immediate example we can think of. Fastest cnc lathe turning machine working, amazing cnc milling machine modern technology. I was interested seeing if anyone has ever programmed anything similar either eccentric turning or turn milling and what software would generate such a program. Face plate fixture eccentric turning or universal fixture. Plus, the goal for this is to use the turning method as a future platform for rope threading, or basically any irregular eccentric turning.
Today these cnc lathes go by the name lu3000 ex, and are available in either v1 or v8 cam options. If this is your first visit, be sure to check out the faq by clicking the link above. Turning is a machining process used to make cylindrical parts in which the cutting tool moves in a linear fashion while the workpiece rotates. Replied by lelef on topic eccentric turning thank you, i know about the steppers, it is good sized and the power supply is good but the lathe is quite big, it is a grazioli dania it is capable of 20 and more mm of cutting on c45 and harder materials,the dc servo of the z has no problem,the stepper with the load of just 12mm has problems. When the throw is large enough to allow all centers to be located on the workpiece at the same time. I was asked if i could cut an ellipse, ive looked it up in the manual but no luck so i have no idea if it can be done with a standard cnc lathe. If the lathe is to be used to turn a crank with a great throw, or a throw that is greater than normally machined on a lathe figure 3102, special throw plates must be fabricated to hold the ends of the work while turning.
Boring or turning jaws offcenter to make an eccentric. A cnc turning center has milling capability, or a second spindle plus milling. I have a femco tc75 lathe built in 1998 with fanuc 18t controles. Learn all about high speed cnc turning with feature rich cnc lathe from fanuc america. Lathe machines are used in metalworking, woodturning, metal spinning, thermal spraying, glass working, and parts reclamation. Lets discuss all lathe machine operations one by one as follows. See more ideas about wood turning, wood turning projects and wood lathe. Dec 27, 20 till now it wasnt a big problem, doing works with the cnc control but doing eccentric turning i think the more fast the stepper goes the less load it can stand so ive thinked to put a dc servo or a brushless servo also for the x,servos can go faster with more constant torque. If you have a vdi turret without a yaxis you will need to move the wedge or spindle to find centerline because the toolholders are not adjustable. The 3 jaw chuck moves all 3 jaws in unison when the chuck is adjusted. Eccentric turning ive seen this done on a pretty basic okuma, and the shop said it was just done via conversational.
How to select the proper cutting tool for lathe operations basic tutorial smithy granite 3in1 duration. The two men identified a need for large cnc turning capability in their portion of the sunshine state. The term eccentric is given to a rotating machine part which is used to throw a mechanism eccentric with its main center line. Another neat thing to try with the eoffsets would be to pump both x and z axis simultaneously to perform guilloche or rose engine turning. The cutters im planning to make are only 34 to 78 diameter for watch and clock work so not as much torque is needed for machining these. The eccentric bushings are designed for use with 25mm. Rigid machine construction is designed to handle bar stock up to 112 1. Eccentrics may be said to include all crank motions, also many cam motions. The idea is to make an expanding or other arbor that has the offset built into the arbor spigot. If the geometric centre of the workpiece is aligned with the chucks centre, the material removal is uniform along the circumference, otherwise i. With our compact chuck you can turn an eccentric position on the workpiece in a single setup without having to rechuck it.
The larger lathe could be converted but would need big motors. Tolerance is not an issue, the part will be sent out for grinding. Gadgets and gizmos eccentric turning for crank pin with 4 jaw, demo. You can cut whats called an interpolated circle on a cnc mill. This is a common need when building engines, for example, to machine the throws of a crankshaft, or the eccentric drive used by a steam engine to operate a slide valve. Cnc turning machining cnc turning parts, products as. Okuma introduced our cam turning lathes at imts in 1990. Hi all, has any one know how to do it thank yousimilar threads. Boring or turning jaws offcenter to make an eccentric i need to turn or bore an eccentric sleeve on my cnc lathe. When the throw is large enough to allow all centers to be located on the. We have an integrex 650h2 machine i found a marco written by rodzilla on the forums but dont fully understand it. It really depends on how close the milling process got us to the final shape. I was thinking of using a milling cutter and the c axis to interpolate it.
To set the correct eccentric distance, i used the bar contact tip on my test indicator. Now, will introduce what is eccentric turning and cnc turning method of eccentric parts. Turning offcenter diameters in one setup in the past, turned parts with one or more offcenter hubs could not be machined in one chucking on a lathe or turning center. I recently tried this on one of our machines, and every few full rotations the caxis stopped for a second, wich is not good for a cutting turning tool. Fanuc programming example which shows the use of multiple fanuc canned cycle in cnc programming, following canned cycle are used in this cnc lathe programming example g71 rough turning cycle haas g72 type i rough and g70 finish facing cycle program example fanuc compatible. Eccentric cnc face turning drunk mori cncing duration. They decided to combine their lean manufacturing and metalworking experience to make such turning work their niche. Theyre designed for the specific purpose of nonconcentric cutting as well as concentric cutting, and can handle nonround parts such as ellipse, eccentric circular and cam. Today the most common type of such automation is computer numerical control, better known as cnc. Okuma eccentric turning camshaft if this is your first visit, be sure to check out the faq by clicking the link above.
If a multitasking machine is used, we recommend milling the eccentric part. So today, with some new steel, i decided to use the vertical mill instead of lathe. If you used an oval turning chuck instead of an eccentric chuck, you wouldnt need any fancy math just set the crosssection oval shape you want with the chuck and program your curve on the zaxis. Hi, im doing some mods on my retrofitted lathe, the fist one is to add an encoder for. Eccentric turning on a lathe is anything that is not centered. Turning a 1 piece miniature crankshaft this one is pretty cool duration. Canadian metalworking asked david fischer, lathe product specialist for okuma america corp. Lathe processing according to customer requirements with the best accuracy on cnc lathes and japanese mechanical lathes, ensuring committed delivery time. Carbide wood lathe knife this cnc wood lathe knife is a new design carbide wood lathe cutter, it is used with cnc wood turning lathe machine, reduces the tool changing times greatly during one day working. For eccentric turning, theres no better chuck than the axminster eccentric chuck that helps you expand your creativity in woodturning. Important customer information and fanuc americas response to covid19. Most turning jobs are concentric and use a 3 jaw chuck to hold the work piece. Dumont eccentric bushings vdi style bushings tool holders.
I have searched extensively and i have not found much information. I have found several people who have used a sensor to determine the spindles speed and created an off set on one axis for concentric. The eccentric contour must rotate around the spindle along the z axis in order to realize the thread pitch. Hi guys, hope you can help i ve got to write a programmacro for turning and milling an eccentric pin like on a crankshaft.
Lathe machine operations are turning operation, facing operation, taper turning operation, knurling operation, grooving operation with pdf download. The first method that springs to mind is to use the 4jaw chuck and offset the work suitably. At most we will do a semifinish operation and then a finishing pass. I currently dont have any live tools setup on the machine. Eccentric chuck concentric and eccentric machining. Lathe machines are used in metalworking, woodturning, metal spinning, thermal spraying, glass working, and parts reclamation the various other operations that you can perform with the help of lathe machine can include sanding, cutting, knurling. Because of the large offcenter weight the 3jaw chuck, the lathe has to be run very slow i used about 300rpm. Turning can be done manually, in a traditional form of lathe, which frequently requires continuous supervision by the operator, or by using an automated lathe which does not. What type of machine setup is best suited to perform an eccentric turning operation. Although i already have posted about the g71 turning canned cyclerough turning cycle, but that blog post just illustrates the use of g71 and g71 parameters this cnc programming example shows a complete contour cutting with g71 and finish cut on contour with g70. To generate the eccentric contour, the x axis requires a stroke motion.
Eccentric turning presents an interesting tradeoff, you want to go fast to have some semblance of surface speed, but are limited by the axis ability to accel and decel. Application eccentric turning of spindle nuts or other. We currently use partmaker for our cam software on our swiss machines and other lathes, and i cannot see any option for programming anything of this sort. Eccentric cnc face turning drunk mori cncing youtube. With eccentric turning the tool is fixed in the spindle and we use x and y to keep it in the tangent to the surface. High precision lathes, cnc lathes and high speed cnc. Youre now reliant on the motion system in either method, and milling the feature will force you to slow that motion system down, improving accuracy. In general shop terms, however, an eccentric is a machine part having an outer circle which is off center or eccentric with its shaft.
A turning center is a lathe with a computer numerical control cnc. It also eliminates the need for changing chuck jaws and is nonmarking. Broaching keyways with the lathe by paul jones i have watched several videos on youtube for broaching internal keyway slots using the lathe carriage while holding the part in the lathe chuck with the lathe totally powered off. Typically, the part had to be rechucked in a special fixture to center the eccentric portions for turning. I tried to turn the big ends on the lathe, eccentric turning, using counterweights this time but i was still not happy with the result from the intermittent turning. Lathe techniques eccentric turning this process describes the making of a simple eccentric with a diameter of 22mm and a throw of 5mm. The new 632y is the result of schaublin machines unique knowhow in turning high precision parts. Commonly performed with a lathe, turning reduces the diameter of a workpiece to a specified dimension and produces a smooth part finish. Just thread the chuck onto your wood lathe and youre ready to go. Eccentric turning milling on 650h2 integrex machinist. Sep 15, 2001 turning offcenter diameters in one setup in the past, turned parts with one or more offcenter hubs could not be machined in one chucking on a lathe or turning center. They arent cheap, but theres a book out there somewhere that is cheap, and if youve got a mill lathe you can make your own from the plans. Andy pughs video of eccentric turning with linuxcnc.
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