Cutting of material is take place in forward direction and no cutting in return stroke of the ram. Though the distances of ram movement during the forward and return stroke remain the same, the time taken by the return stroke is less as it is faster. Machine Design Notes , article , Interview Que. The angular surface can also be machined in a universal shaper or by using a universal vice without swiveling the tool head. The driving motor, variable speed gearbox, levers, handles, and other controls of shaper are also contained in the column. It is a free resource site for Mechanical Engineering aspirants. Additionally, he has interested in Product Design, Animation, and Project design. The piston speed is changed by varying the amount of liquid delivered by the pump. Whitworth Quick-Return Mechanism It is one of the inversion of the slider-crank chain shown in fig. warning signs, you just might save a life from stroke. But during the return stroke, the ram moves at a faster speed. It always plays a very crucial role in manufacturing parts, different jobs, etc. The kerf created by a given blade can be changed by adjusting the set of its teeth with a tool called a saw ... a narrow saw blade held in a frame, worked either by hand or in a machine, sometimes with teeth on both edges ; History. Oil at high pressure is pumped to the cylinder of the hydraulic system. The table may or may not be supported at the outer end. Return Stroke O B. The vise is specially designed for use in shapers and has long ways which allow the jaws to open up to 14″ or more, therefore quite large workpieces can be held. The single-point cutting tool is fixed in the ram and the workpiece is fixed on the work table. The mechanism used in Shaper Machine is Whitworth Quick Return Mechanism. 2. The apron is then further swiveled away from the work so that the tool will clear the work during the return stroke. The metal is removed when the ram moves away from the column, i.e pushes the work. Save my name and email in this browser for the next time I comment. The Base is designed to take the entire load of the machine tool and it is bolted to the floor of the shop. larger than (b). For the model to be considered a quick-return the desired time ratio should determine the radius of the crank and the length of the slider. The tool head slides in a dovetail at the front of the ram utilizing T-bolt sand is fastened to the ram on a circular plate so that it can be rotated for making angular cuts. dynamic stroke (c). The return stroke of shaper machine is called (a). The forward and return strokes constitute one operating cycle of the shaper. It is called an empty trip. Pantograph (c). During return, there is no cutting action and this stroke is called the idle stroke. Keyways cutting 6. The tool used here is the Single Point Cutting tool. It consists of two parallel guideways on its top perpendicular to the ram axis is called as a saddle to move the table in crosswise direction by means of a feed screw. Answer: c Explanation: Back and forth movement of ram is called stroke, but only in forward stroke useful work is done. In a standard shaper, cutting takes place during the forward stroke of the ram and the backward stroke remains idle. The RAM is in semi-cylindrical form and heavily ribbed inside to make it more rigid. Maximum horizontal travel of table 3. Working Principle: The job is rigidly fixed on the machine table. 2. This mechanism is known as the quick return mechanism. The Shaper The shaper is a relatively simple machine. Language: English Machining inclined surface 4. A shaper is termed as standard or plain when the table has only two movements, vertical and horizontal, to give the feed. In a shaping machine, a flat horizontal surface is machined by moving the work mounted on the table in a cross direction to the tool movement. The x-height tends to be very tall in relation to the cap height. In a shaper, the work piece is held stationary during cutting, while the tool reciprocates horizontally. The length of the stroke is calculated to be nearly 30mm longer than the work. • Forward and return strokes constitute one … There are vertical shapers that are specially designed for machining internal keyways. According to the type of design to the table. This leakage of... Slotter Machine - Types, Parts, Operations, Diagram, Specification. For making the object, the raw material is pushed into a die to provide it with the desired shape. Ram is a rigidly braced casting and is located on the top of the column. The crosswise movement of the saddle causes the table to move crosswise direction by rotating the crossfeed screw. The ram of a hydraulic shaper is connected to a piston. The depth of the cut increments by moving the workpiece, and the workpiece is fed by a pawl and ratchet mechanism . The saddle moves up and down (Y-axis), usually manually, to set the rough position of the depth of cut. The clapper box is hinged so that the cutting too] will not dig in. Whitworth mechanism A quick return mechanism is a mechanism which produces a reciprocal effect so that the system takes less time in the return stroke while comparing with forward stroke. The amount of feed or depth of cut may be adjusted by a micrometer dial on top of the down feed screw. The down feed is given by rotating the down feed screw. Machining irregular surface 7. Burden of Stroke. Forward stroke of the slam is cutting stroke. If What you looking for is not here, you may send a request to modify articles, Notes, and Content modification, Feedback, Suggestions here (Team will reply as early as Possible ): Contact Form or Using Whatsapp, © 2021 Copyright Learn Mechanical Engineering. The ram holding the tool gets the reciprocating movement. The various main parts of lathe machine are . a) true b) false View Answer. 9 About 7.2 million Americans ≥20 years of age have had a stroke. The length of stroke is always the principal dimension, but a number of other details are also required for specifying a shaper fully. An extra 150 mm must be added before and after the part for acceleration and deceleration to take place. The Shaper Machine is a reciprocating type of machine tool basically used to produce Horizontal, Vertical or Inclined flat surfaces by means of straight-line reciprocating single-point cutting tools similar to those which is used in lathe operation. smaller than 1/4" radius, convex shape along the edge of a part A. angle cutter B. form cutter C. slitting saw cutter D. staggered-tooth cutter E. plain cutter F. fly cutter G. side cutter Forward Stroke O C. Neither The Forward Nor The Return Stroke O D. Both The Forward And Return Strokes O E. Upward Stroke This is the most general type of shaper used in common practice. Cutting and return speeds are uniform throughout the strokes. It can be moved crosswise by rotating the crossfeed rod and vertically by rotating the elevating screw. In a hydraulic shaper, reciprocating movement of the ram is obtained by hydraulic power. This type of shaper in not very widely used. The cutting stroke having a definite stopping point. Operation Performed On Shaping Machine Or Shaper. The cutting stroke is carried out at low speed and the return stroke is carried at high speed. On the return stroke the tool swings away from the work and gives clearance, which prevents the work from being scratched. The piston is pushed by the oil and being connected to ram by piston rod, pushes the ram carrying the tool. QR mechanisms are used in shapers, power-driven saws, and many other applications requiring a load-intensive working stroke in comparison to a low-load return stroke [1–3]. Heavy and unwieldy jobs which are very difficult to hold on the table of a standard fed past the tool are held static on the basement of the machine while the reciprocate and supplies the feeding movements. Face drooping, arm weakness, speech, time to call 9-1-1. Types of Quick Return Mechanism:-1 Hydraulic Drive: Hydraulic drive mechanism is one of the mechanism used in shaper machine. If What you looking for is not here, you may send a request to modify articles, Notes, and Content modification, Feedback, Suggestions here (Team will reply as early as Possible ): Types Of Shaping machine | Classification Of Shaper. Read more: Types Of Shaping machine | Classification Of Shaper. Length and width of table top 7. There is no cutting action in (During return) and this stroke is called the idle stroke. However, the return stroke is made at up to twice speed of the cutting stroke. Source: JBDON. This machine is called a mechanical shaping machine. In the forward stroke, the Slider moves fast and removing the material from the workpiece. and return strokes. Stage I. A cam may be defined as a machine element having a curved outline or a curved groove, which, by its oscillation or rotation motion, gives a predetermined specified motion to another element called the follower. The Whitworth quick return mechanism is used in the slotting machines as well as in the shaper. Work that cannot be held in the vise (due to size or shape) is clamped directly to the shaper table in much the same way as parts are secured on milling machine tables. According to the reciprocating motion to the ram: The crank and slotted link mechanism of a crank type shaper converts the rotation of an electric motor into the reciprocating movement of the ram. Answer: a Explanation: C.S.=length / time. Construction. During return, there is no cutting action and this stroke is called the idle stroke. Hydraulic drive 2. More often than not, the serifs are the same thickness as the strokes on the letterforms. Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. The cutting speed is not usually very high speeds of reciprocating motion due to high inertia force developed in the motion of the units and components of the machine. The head allows the tool to have an automatic relief during the return stroke. For example, fifty to sixty strokes a minute by hand on a 5 to 6-inch stroke machine might feel comfortable but, allowing for lost time at the end of each half stroke, this gives at tool speed of over 60 feet/minute - which is 30% greater than that recommended for high speed steel on cast iron. Cutting ratio m= Return stroke time . The end of the piston rod is connected to the ram. 3. Apron consisting of clapper box and tool post is clamped on the vertical slide by the screw. A round nose tool is used for this operation. The base supports the column or pillar which supports all the working parts such as ram, work-table, drive mechanism, etc. 7. Large internal and external gears may also be machined by the indexing arrangement of the rotary table. The size of a shaper is determined by the maximum length of cut or stroke it can make. First and foremost task is to place the work piece on the table. The tool is fed downwards by rotating the down feed screw by hand at the end of the return stroke. a) only back b) only forth c) back and forth d) none of the mentioned View Answer. Work setting requires more skill and more time. Work is mounted on a table which reciprocates while the tool is held on the machine frame and fed into the work. Another advantage is that the machine does not make any noise and operates very quietly. This Welding Process was first developed in 1949 by Karl-Heinz Steigerwald who was a German physicist. In a lathe machine, the workpiece rotates against the tool. There are 4-types of operations performed in a shaper machine, and those are: Horizontal surfaces are machined by moving the work mounted on the machine table at a cross direction with respect to the ram movement. Repeat the above-said procedure. Beam engine (b). The crank and slotted link mechanism that drives the ram is contained within the column. The complete specification of a typical shaper is given below. Cut with unparalleled precision, flexibility and efficiency. The motion of the ram in the form of reciprocating is obtained by a quick return motion mechanism. In a standard shaper, metal is removed in the forward cutting stroke, while the return stroke goes idle and no metal is removed during this period. If the length of the cutting stroke is 10 mm and time required by the cutting stroke is 5 second, then find the value of cutting speed in mm/second. (b))and the return stroke is completed in less time which is proportional to angle β, Shaper , Planer , Slotter machine | Interview Question and Answers, Major Shaping Machine parts and its Functions, Difference Between Shaper and Planer – Learnmech, What is Slotting Machine- Principal parts of Slotter Machine, Hydraulic shaper machine – Working, Circuits, Advantages, Application, Milling Machine – Types, Working, parts, Operations, Cutting parameter, Shearing Machine – Types, Principle, Working, Operations, Press Machine – Types , Parts , Diagram , Specifications. The tool post is mounted on the clapper block. The length of the ram stroke can be changed by unclamping and moving the trip dogs to the desired position. Maximum vertical travel of table 4. The direction of the motion of the tool is called a feed. When vertical surfaces are machined, the feed is given to the tool. Ground vertical guideways when under the cutter type of shaper in not very widely used uncut... 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