Edm Ppt
..., Civil Engineering Profession Published on Mar 23, 2017 Edm is a surveying instrument used to measure the distance electronically. This Surveying Instrument is used in triangulation to measure the length of Base line because more accuracy is required to measure the length of base line. 1. Distance Measurement by Electronic method Based on Hard-wired algorithm Relay on Propagation, Reflection and subsequent reception of electro-magnetic Wave Electronic Angle Measurement (Combined the function of theodolite & EDM – TOTAL STATION) 2. Short Range • Range<3km • ±(0. 2+1mm/km) accuracy • Telluromerter Medium Range • Range<25km • ±(5+1mm/km) • Geodimeter Long Range • Range<100km • ±(10+3mm/km) • Distomat On the basis of Range of Operation 3. On the basis of carrier wave Used Microwave • Long range instrument • Freq range 3 -30GHz Visible light • Medium range • Freq used 5 x 1014 Hz Infrared • Short range 3 x 1014 Hz 4. Geodimeter Heavier Instrument Observations are limited to nights only Instrument set up at one end & reflector at other end Light Radio Waves are used Tellurometer Lighter Instrument Observations may be made during the day as well as during the night Two identical instruments at either ends High Frequency Radio Waves are used 5.
Edm ppt download
26. Applications:- Mould and part manufacturing-injection nozzles Oil drain holes, hydraulic cylinders and dowel pins, turbine blades, ball bearings and safety wire holes in hex nuts. 27. () () (tool/39176/Nonconventional-methods-ofmachining) Research performed on the EDM process () REFERENCES:
Wire cut edm process ppt
A 1 at the 5. position works like trading of the coordinate-systems Both results were generated with the same File 12 Influence to the results 2 Examle Agie with Rel. Date March 5, 2002 1. 2. 4. 5. 6. 7. 8. 0 0 0 0 0 0 0 0 _ 8. code Electrode / workpiece _ 7. free _ 6. free _ 5. basic (1? exchanges basic system! ) _ 4. /- C (1? exchanges /- C) _ 3. /- Z (1? exchanges /- Z) _ 2. /- Y (1? exchanges /- Y) _ 1. /- X (1? exchanges/- X) always stored in C\TEMP\Agie \ Each measurement gets a directory? Title ELE-1..... i or WKS-1.... i File Name 0? ELEKEle, M, -38. 611, 34. 783, 50. 242, -7. 740 1? WKSEle, M, -38. 740 0? ELEKEle, M, -38. 740 1? ELEKEle, M, -42. 944, 29. 266, 50. 242, 7. 740 13 Influence to the results 3 Example Agie Evolution with Rel. /- X (1? exchanges/- X) Stored at.... \ Each measurement generates another line at the end of the files 0? ELEKEle, M, -38. 740
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Metal disintegration machining Several manufacturers produce EDM machines for the specific purpose of removing broken tools (drill bits or taps) from work pieces. In this application, the process is termed "metal disintegration machining". 19. COINAGE DIE MAKING This type of EDM is usually performed submerged in an oil-based dielectric. The finished object may be further refined by hard (glass) or soft (paint) enameling and/or electroplated with pure gold or nickel. Softer materials such as silver may be hand engraved as a refinement. Master at top, badge die workpiece at bottom, oil jets at left (oil has been drained). Initial flat stamping will be"dapped" to give a curved surface. 20. Small hole drilling On wire-cut EDM machines, small hole drilling EDM is used to make a through hole in a workpiece in through which to thread the wire for the wire-cut EDM operation. A separate EDM head specifically for small hole drilling is mounted on a wire-cut machine and allows large hardened plates to have finished parts eroded from them as needed and without pre-drilling.
Due to bridging effect, the gap voltage and insulting strength of dielectric fluid reduces which result in easy short circuiting. Due to this, electric density decreases and hence uniform distribution of sparking takes place. This leads to uniform erosion on work piece which results in improvement in surface finish. 20. Dry EDM is a 'green' environment friendly EDM technique in which instead of mineral oil based liquid dielectric, gas at high pressure is used as the dielectric A high velocity gas flow is supplied through a thin walled pipe electrode. The role of the gas is to remove the debris from the gap and to cool the inter electrode gap. During the pulse interval, the gas jet blows off the plasma formed by previous pulse discharge and decreases the temperatures of the discharge spots. DRY EDM INNOVATIVE EDM TECHNOLOGIES 21. Factors favouring dry EDM: i fire hazard ii. No toxic fumes generated iii. No need for special treatment for disposal of sludge, dielectric waste, etc Other Advantages: a) Very low tool wear.