Homemade EDM (Electric Discharge Machining) Machine I made the majority of this homemade EDM a long time ago. Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). Investigation on machining copper plates with NiP coated tools using tailor-made micro-electro discharge machine. Classification of Metal Removal Processes and Machine tools. Q9. The tool travels vertically or orthogonal to the surface of the part at amplitudes of 0.05 to 0.125 mm (0.002 to 0.005 in. d) 5 to 25 Volts . Ultrasonic machining is a subtractive manufacturing process that removes material from the surface of a part through high frequency, low amplitude vibrations of a tool against the material surface in the presence of fine abrasive particles. Q10. Electrical discharge machining produces surfaces with a fine finish and high precision. He was an English physicist. The process of automating one or more EDM machines is similar to that of other conventional machine tools. Laser-assisted electric discharge machining is a hybrid process of combining both laser beam machining (LBM) and electro-discharge machining (EDM) in order to address the problems associated with the both EDM and laser. The basic EDM process is an electrical spark that is created between an electrode and a work piece. Electric Discharge Machining. 522-538. Heat from After completing the questions look at the answers and verify with yours. 4, pp. The tool (the wire) is usually made of copper, brass or tungsten and of outside diameter 0.25 mm. Advances in Materials and Processing Technologies: Vol. In ECM, DC power supply is in the range of. In plunge grinding (A) The work is reciprocated as the wheel feeds to produce cylinders longer than the width of wheel face (B) The work rotates in a fixed position as the wheel feeds to produce cylinders equal to or shorter than the width of wheel face (C) The work is reciprocated as the wheel feeds to produce cylinders shorter than the width of wheel face - The Ultrasonic Machining has various industrial applications due to its safe and noiseless operation. on the tool, only hydrogen gas evolves at the tool or cathode. a) Spark erosion machining. The capacitance (in μ F) in the circuit is Wire electric discharge (ED) machining is based on the same principle as that of _____ a) hydro-dynamic EDM b) die-sink EDM c) polar EDM d) non-conventional EDM View Answer This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Applications – 1”. ). - The tool used in USM process is made of soft material and oscillated at the frequencies of the order 20-30 kHz. Electrical Discharge Machining (EDM) is a process that uses electrical discharges emitted from an electrode to erode an electrically conductive material. You can find the answers at last. As the material removal takes place due to atomic level dissociation, the machined surface is of excellent surface finish and stress free. UNIT III ELECTRICAL ENERGY BASED PROCESSES 8 Electric Discharge Machining (EDM)- working Principle-equipments-Process Parameters- Surface Finish and MRR- electrode / Tool – Power and control Circuits-Tool Wear – Dielectric – Flushing – Wire cut EDM – Applications. In electro discharge machining, cutting tools are usually made of; 1) High speed steel; 2) Tool steel; 3) Carbide-tipped tool; 4) Graphite - 7234270 Application of new tool material for electrical discharge machining 403 tion of ZrB2 particles in Cu matrix and beyond this level hardness decreases with the increase of Cu (soft phase) addition. a) 5 to 10 Volts. 2 depicts the electro-chemical reactions schematically. “Generally, workpieces are mounted on a pallet system and the automation changes the pallets in and out of a chuck on the machine… Electrical discharge machining is a machining technique principally used for hard metals and metals that are difficult to machine using traditional methods. Electrical discharge machining (EDM) is a machining method primarily used for hard metals or those that would be impossible to machine with traditional techniques. The workpiece is typically cut from a larger piece of stock, which is available in a variety of standard shapes, such as flat sheets, solid bars, hollow tubes, and shaped beams. Electrical Discharge Machining EDM is the thermal erosion process in which metal is removed by a series of recurring electrical discharges between a cutting tool acting as an electrode and a conductive workpiece, in the presence of a dielectric fluid. c) 5 to 20 Volts. All are on Manufacturing technology exam questions. a) Complex shapes b) Simple shapes c) All of the … Electrical Discharge Machining & Automation. Basic equipment: electro-discharge machine tool. It was first observed in 1770 by Joseph Priestley. Later on in the 1940's Soviet researchers developed a machining process that formed the foundation for modern day EDM. Electrical Discharge Machining (EDM) is a non traditional machining and electro thermal process in which material from the workpiece is removed by using electrical discharges (sparks). Electrochemical grinding is a process that removes electrically conductive material by grinding with a negatively charged abrasive grinding wheel, an electrolyte fluid, and a positively charged workpiece. 1. Moreover, EDM allows users to machine hardened workpieces. 14. Machine tool - Machine tool - Electrical-discharge machining (EDM): EDM involves the direction of high-frequency electrical spark discharges from a graphite or soft metal tool, which serves as an electrode, to disintegrate electrically conductive materials such as hardened steel or carbide. Fig. Which of the following shapes can be produced using Electro discharge machining? Whereas other machining techniques need to be executed before the workpiece is hardened with heat treatment, electrical discharge machining can be applied on the hardened material as well. b) 5 to 15 Volts. Founded in 1980 to provide a specialist sub-contract Wire and Spark erosion service to the engineering industry. The history of EDM Machining Techniques goes as far back as the 1770s when it was discovered by an English Scientist. Electrical discharge machining is a method of removing metal using an electric sparks, similar to a plasma cutter but on a much smaller scale and under water. In ECM, the shaped tool is made out of. This test contains 50 questions with 4 answers you have to choose the right answers and count your score. - USM tool oscillates normal to the … Machine tool, any stationary power-driven machine that is used to shape or form parts made of metal or other materials. The electrical discharge machining also called as. Materials removed from the workpiece stay in the electrolyte fluid. (2017). The original target market was the West Midlands region of the United Kingdom, now our customer base is the whole of the UK, we also export our services to … Therefore, it is possible to erode or “burn “electrically the reverse shape of the electrode into the work piece. In EDM machine the material is removed by rapidly recurring (repeating) discharges of current in between the electrodes. The SEM images of sintered samples are shown in figure 5. Machine tools were among the innovations that made mass production and interchangeable parts realities in the 19th century. a) Brass. Typically the electrode diameters range from .004″ – .012″ (.10mm – .30mm), although smaller and … b) Copper. The origin of electrical discharge machining goes back to 1770, when English scientist Joseph Priestly discovered the erosive effect of electrical discharges. 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