By di rectionally engaging the feed levers singularly or in combination a con. Mar 25, 2014 bar feeding mechanism of capstan lathe. A design procedure for increasing the indexing accuracy of intermittent grooved globoidal cam mechanisms is presented. The index plate has 24 holes and the periphery of job can be divided into 2, 3, 4, 6, 8 and 12 equal parts directly. The structure of roller gear cam mechanism is shown in fig. Single servo motor for turret indexing and live tool drive with din 5480 coupling. One rotation of the cam shaft completes one indexing cycle, consisting of declampindexclamp operations. Construction, operation and tool layout in semiautomatic. Pink cam retracts the green plunger during indexing. As shown in figure 2, a is a cylindrical roller, b is a.
Fix the turret to the machines slide a by means of 8 appropriate screws c highresistant screws according to class 12. With the turret off of the machine, can see that the drive mechanism for the live tooling is about one half station off. In this case, different index plates with varying number of holes are used to increase the range of indexing. Tailstock replaced by turretthat holds up to six tools. Differing slightly from the globoidal sx indexing tables, by the internal design of the cam and turret.
At the top of the spindle, the turret head is mounted. Maybe it is a simple matter of the curvic coupler being disengaged and the turret stopped when it hit during indexing. Movement of indexing coupling 6 is controlled by parallel index mechanism1 and 2. This invention relates to turret indexing mechanism and more particularly for lathes, especially turret lathes. When connecting the machine, remove the cover, carry the conduit through the hole. This turret mill is designed and intended for use by properly trained and experienced personnel only. A 47station turret provides high flexibility and reduces setup time, increasing machine productivity. Nov 27, 2014 i can answer about indexing in turret punch presses, for example as amada or strippit turret punching machine machines. Capstan lathe working operations are faster because of lighter in construction. A general framework for geometry design of indexing cam mechanism. A stressrelieved bridge frame is ruggedly designed to ensure positioning accuracy and superior reliability. The amada turret punch press is equipped with a numerical control nc system in which three driving axes are simultaneously controlled by three dc seno motors.
Over the years i have built many gearboxes to do this, some of which worked okay, others could be heard grinding slowly from the other side of. Improving indexing accuracy of grooved globoidal cam. The versatile mix of turret stations includes three. Tooling layout proper planning for systematic operations to be carried out on turret and capstan lathes is done in advance before setting the work on the lathe. Direction of rotation of turret axis is defined as z. A subtype of horizontal turret lathe is the flat turret lathe.
Operating instructions and parts manual variable speed. Suitable for back machining without loss in performance. The mechanism consists of three parts, namely a globoidal cam, a turret, and a roller. Problem with indexing on lee classic turret press the. The contents shared in this blog is not originally created by me all those stuff are what i have searched and acquired from nernet hoping that one day when i become a professor this blog mi8 be so helpful for my students so that they can easily gain knowledge with less timei also recommend you guys who see this blog to create your own blog,website,youtube video channels so that good. If you are not familiar with the proper and safe operation of a turret mill, do not use until proper training and knowledge have been obtained. It is based on the synthesis of asymmetrical dwellrisedwell drd rollerfollower turret motions to improve the kinematic and dynamic performance of the globoidal camturret devices for highspeed applications. Pdf presentation of a mechanism with a maltese cross. Effects of clearance on dynamics of parallel indexing cam.
This type indexing is most commonly used for indexing fixture. The strippit mseries of cnc turret punch presses offer the largest turret capacity of machines in their class. It evolved from earlier lathes with the addition of the turret, which is an indexable toolholder that allows multiple cutting operations to be performed, each with a different cutting tool, in easy, rapid succession. A prime example of this theme was the development of the turret lathe, whose turret indexes tool positions. In case of crash the turret may slip and turn around the reference pin. As you can notice, the tailstock of the normal lathe is replaced by the turret which can mount several tools and is free to rotate along its vertical axis depending on the required tool to be used for the specific operation. Indexing in reference to motion is moving or being moved into a new position or location. The contents shared in this blog is not originally created by me all those stuff are what i have searched and acquired from nernet hoping that one day when i become a professor this blog mi8 be so helpful for my students so that they can easily gain knowledge with less timei also recommend you guys who see this blog to create your own blog,website,youtube video channels so. Turret indexing mechanism in capstan and turret lathe. The arm swivels between machine turret and magazine.
Paper open access general expression of pressure angle. Its turret is flat and analogous to a rotary table, allowing the turret to pass beneath the part. So the turret jumped some of the cogs in the coupler rather than bothering the taper pins. Usually to bring the turret axis to the machine axis an adaptor plate b must be foreseen. It is used to manufacture any number of identical pieces in the minimum time.
A general framework for geometry design of indexing cam. The picture below shows the sketch of a typical turret lathe and all the parts are clearly marked on it. Automatic turret indexing mechanism mohamedsalehsaad. Download as ppsx, pdf, txt or read online from scribd. The turret lathe is a form of metalworking lathe that is used for repetitive production of duplicate parts, which by the nature of their cutting process are usually interchangeable. A flexible turret index position the cutting tools in your turning centers change on a regular basis. Turret indexing mechanism in capstan and turret lathes turret. Turret press indexing explained the square ratchet is both free to rotate inside the clamp and held fast by the clamp, depending on which direction the ram is moving. Turret side each head has a correlated feed and traverse lever on the pendant. A buddy of mine owns a lee turret press, the old style. Indexing in reference to motion is moving or being moved into a new position or location quickly and easily but also precisely. The turret lathe has essentially the same parts like the engine lathe except for the turret and complex mechanism incorporated in it for making it suitable for mass production work. Can be used within a cycleondemand, or continuous running environment.
Quiet operation, energy saving back spindle torque chart and improved machining accuracy by less in. Tools can be easily mounted on the turret by turning one bolt for fast tool setup changes. This unit is also capable of high positional accuracies due to the large pcd of the roller followers, but more suited to slower speeds with large mass movement capability. A quick handindexing foursided turret is commonly mounted on the front of the cross. The versatile mix of turret stations includes three 3. Turret indexing mechanism filed april 14, 1958 5 sheetssheet 4 clmped fie. Separate feed stops are provided for each face of the turret. Do not use this turret mill for other than its intended use. Turret indexing mechanism of capstan and single spindle turret lathe is typically shown schematically in. Driven tools are possible at every station as well. In this way any subsequent realignment will be facilit ated.
Power indexing of the turret in either direction, if the machine is so equipped, is controlled from the pendant. Although originally developed as a stop to prevent over winding of watches, it is now extensively used in automatic machinery, e. Following are the main parts of a capstan and turret lathe, bed. The turret of the turret lathe is usually power operated. If you are lowering the press lever raising the ram you dont want the turret to rotate, so the square ratchet must be free to rotate inside the clamp. The gear turns the stop mechanism on the other end of the turret slide, and it is captured by other stuff inside the slide so it wont fall out. To change the punching tools there is turret with lots of tools so changes are made with turret rotation itself. A quick hand indexing foursided turret is commonly mounted on the front of the cross. Quiet operation, energy saving and improved machining accuracy by less in. I can answer about indexing in turret punch presses, for example as amada or strippit turret punching machine machines. Us27915a step drilling turret indexing and feeding.
Strippit st and vt thin turret 20 and 30ton cnc punch presses provide the flexibility to handle short to long production runs, punching and forming applications, and are equipped with features that add up to higher productivity. The present invention contemplates an indexing mechanism for an indexible turret of a machine tool wherein the operator can initiate the indexing movement of the turret in either direction and without further attention from the operator the indexing movement of the turret automatically will stop after the turret has been indexed one station and the turret will be accurately located and locked in its indexed position at the new station. The nc system decodes the input command and the corresponding instruction is transmitted to dc servo motors which drive the table and the carriage to position the worksheet for punching. The atc arm comes to this position and picks up the tool. Front milling with the tools on turret and back milling with the tools on back tool post can be simultaneously performed. When indexing a machine part, its new location is known to within a few hundredths of a millimeter thousandths of an inch, or often even to within a few thousandths of a millimeter tenthousandths of an inch, despite the fact that no elaborate measuring or. To minimize tool change time during setups, many setup people will simply load the tools required for the new job and leave tools in the turret from the last job as long as they dont interfere with the new job. Axial movement of 3 piece coupling is controlled by drum cam 7. The entire indexing mechanism is housed in a meehanite grade casting that helps damp cutting induced vibrations. There is a small vertical spindle fixed on the turret saddle. For the first time in 1860, pratt and whitney developed the capstan lathe. It contains an indexing mechanism for bringing the tools held on its six faces against the workpiece in a preselected order. In this paper, three kinds of rollers are meshed with the globoidal cam to generate the cam profile. The curve of the gic mechanism is shown in figure 1.
Paper open access general expression of pressure angle and. These lathes were first developed in the united states of america by pratt and whitney in 1960 capstan lathe is one of the types of semiautomatic lathe in semiautomatic lathes machining operations are done automatically. Green plunger keeps the shaft immobile after indexing. Turret indexing mechanism the turret 1 is mounted on the spindle 5. One of the problems i have encountered is how to realistically turn the turrets. A capstan and turret lathe is used to manufacture any number of identical workpieces in the less time.
The 12 position drum turret and 16 position drum turret use vdi tool holders for ease of tool setup. When the index plate or the turret rotates through one sixth of revolution, the pin and plunger 14 drops out of cam 10 and the plunger locks the index plate at the next groove. Btp electromechanical turrets btp turrets use an induction motor drive, and a set of cams to index and clamp the tool disc. Fast index is achieved by not lifting the turret face. The turret holding the next tool is now fed forward and the pawl is released from the ratchet plate by the spring pressure. Parallel index cam mechanism driven by hydraulic motor ensures smooth and fast indexing of heavy tool discs.
This application is a division of a copending application serial no. Us patent 2,358,503 turret indexing mechanism was issued to louis edward godfriaux of madison, dane county, wi. For many years i have been building model battleships. Operating instructions and parts manual variable speed turret. Provision for central supply of high pressure coolant. Turret indexing mechanism in capstan and turret lathes. Encoder fixed coupling 5, indexing coupling 6 and sliding coupling4 form a set of 3 piece coupling. The turret indexes, stationtostation under one second. Step drilling turret indexing and feeding mechanism 8 sheetssheet 4 filed dec. Capstan and turret lathe machine the engineers post. After receiving the tool change command, the tool to be changed will assume a fixed position known as the tool change position. For indexing turret tool head, the handwheel of the ram is reversed and turret tool index automatically. According to the result, reasons for impulse vibration on turret are mesh impacts when number of meshing roller changes in parallel indexing cam mechanism with clearance.
Turret indexing mechanism in capstan and turret lathes turret indexing from mechanical 230 at abu dhabi university. Old hardinge bench lathe turret not fully indexing hello all first post here, so if i am posting to wrong forum or otherwise breaching protocol, please bear with melet me know. Vdi turret for convenient tool setup upper turret lower turret. Origin o is located on the intersection of turret axis and common perpendicular of line. In a turret indexing and locking mechanism for a machine tool and in combination, a turret support, a turret rotatably mounted on said support, binding means engaging the turret and support and adjustable to bind the turret against the support and adjustable to unbnd theturret from the support, a locking dise having bolt receiving notches and connected to the turret to rotate in unison therewith, a locking beit shiftable into and out of the notches of the locking disc, means engaging the. A threepiece hirthtype coupling is used to hold the clamped turret radially.