Which of the following gas, should never be used as the carrier of abrasives? d) None of the mentioned Explanation: Both machinability and MRR depends on brittleness of material. d) All of the mentioned Explanation: Abrasive jet machining can be used for cutting, drilling, deburring and cleaning processes. Kanwal Jeet Singh 1, , Inderpreet Singh Ahuja 2 and Jatinder Kapoor 3. “In Abrasive jet machining, commercial grades powders can be used for machining.” Explanation: In Abrasive jet machining, material utilization is very high since it removes material by using abrasives. b) Wearability d) Decrease up to a limiting condition, 1. d) 100 – 150 μm c) Striations a) Increased Difficult to machine materials include glass, diamond and tungsten carbide, etc. Answer: b Magne-trostriction’ means a change in the dimension occurring in f… Explanation: Tool and work piece are at a distance apart in this type of machining. 1. Who discovered USM? What is the percentage of contribution of cavitation to the total material removed? Which of the following use ECM for different applications? Draw schematically the USM equipment x. d) Decrease up to a limiting condition How much percent of the abrasives are recommended in general for abrasive medium? a) 5 times What is the machinability rate of glass by USM? View Answer. 11. What are the type of materials that can be machined using Abrasive jet machining? Which of the following materials in Abrasive jet machining can be a health hazard? d) None of the mentioned, 2. When machining porous material, which type of mechanism is introduces? c) Unsteady abrasive flow a) Only rotation a) Erosion The relevance of this study is that it establishes empirical relations as a function of machining variables, relevant to analyse the machinability of glass fiber reinforced composite. d) 1945 Explanation: Relative motion in Abrasive jet machining can be controlled by the above mentioned means. 6. d) Laser Beam Machining, 1. Who discovered USM? In AJM, which of the following materials are used as abrasive grains? b) 1958 View Answer. Answer: b What are the materials used for abrasives in Abrasive water jet machining? c) Abrasive grains a) ± 0.01 mm a) Balamuth a) <5% Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Which of the following distribution factors, does not affect the machining parts? b) 2.0 to 8.0 kg /cm2 Answer: c b) 2 hrs Explanation: Electrolyte jet in micro ECM acts as the micro tool for machining. 10. b) Two times smaller a) Side wear of tool b) Electrodes In machining system of AJM, what is/are the gas/es used for carrying the abrasives? Which type of materials cannot be machined using Abrasive jet machining? a) 25% State whether the statement is true or false. b) Wider gap width d) None of the mentioned b) Work piece d) None of the mentioned In which year, discovery of USM took place? The objective of the present work is to find out main effect of cutting speed, feed rate, drill diameters, work piece material, drill material and interaction effect between drill material and cutting speed on MRR, Surface roughness, Hole diameter error, and burr height. d) High In machining system of AJM, which is the medium of carrying the abrasive grains for machining? Explanation: Relatively larger amplitudes are obtained when amplifier is used. c) 15 times In the machining system of AWJM, which one accelerates the abrasives to remove material? a) Cleaning a) Abrasive grains c) Glass beads Explanation: Tool over cut size is 2 or 4 times greater than mean grain size. View Answer. b) False When the static pressure of the feed is increases, MRR ____. a) Nozzle a) <100 mm2 By using Abrasive jet machining, how much amount of hardening does the materials experience? In chemical machining is material removal takes by? Ultrasonic Machining is one of the types of Non-Traditional Machining methods which produces Circular, non-Circular holes of very small size is <1mm size can be produced by using this Ultrasonic Machining Method.. View Answer. 6. c) Deburring In the following properties of abrasive grains, which of them changes rate of material removal? USM is most commonly used to machining of glass, ceramics, zirconia, precious stones, and hardened steels. c) Remains same a) True 1. d) All of the mentioned b) Abrasive wear Answer: d After how much time tool has to be changed in AJM? b) 15 – 20 % b) 0.08 – 0.13 μm d) Abrasive Jet Manufacturing c) Velocity 113/45 Explanation: Rotary Ultrasonic Machining can be used to drill holes in the above mentioned materials. 2. 3. b) Steve O Flawer c) Corrosion View Answer. Machinability of fibre-reinforced plastics Davim , J. Paulo Presents Polymer-based fibre reinforced composite materials and addresses the characteristics like low density and coefficient of thermal expansion, specific strength with better fatigue resistance and modulus. On which of the following features of cavity, will the penetration depth depend on? c) Joule 4. a) Tool b) Water jet stream Answer: c Masks, which are used to confine the jet stream location on work piece are made of, which type of materials? In AJM, what is the mechanism of removal of material from the work piece? a) Ions While machining B4C, tool over cut size when compared to mean grain size is? b) Jet engines c) Increase and then decrease a) 1 hr b) Plasma b) 0.3 μm d) Ultra sonar machining b) 20 – 60 μm Explanation: Using Ultrasonic Polishing, very low values of surface finish can be obtained, which may be very low as 0.3 μm. a) 10 L/min b) 10 – 40 µm 8. In machining system of AJM, which of the following controls the relative motion between work piece and nozzle? At what rate slurry is pumped through nozzle in USM? b) Wearability 10. d) 150 – 250 μm, 10. b) 50% a) Mechanical energy c) 5 hrs c) Perpendicular c) Accuracy c) Drilling and trepanning a) 0.1-10 μm a) LBM a) Tungsten Carbide Answer: d View Answer. d) None of the mentioned, 4. Explanation: The optimal range used is between 10-40 μm. a) 0.01 – 0.10 mm Answer: c Also, the assumptions made are: 1. b) 1925 b) EDM In production of EDM electrodes, typical ultrasonic speeds, in graphite ranges between? a) 25% b) 50% c) 75% d) … These are mainly due to the abrasive nature of the synthetic fibres. b) Cavitation View Answer. 7. d) None of the mentioned, 10. Explanation: Tool is softer than work piece in USM. Which of the following are the features of tool affecting MRR in USM? a) True c) Medium b) Abrasive wear “Hole oversize measures the difference between hole diameter measured at the bottom surface, and the tool diameter.” d) All of the mentioned d) All of the mentioned a) Abrasive grains d) PAM c) Tool & Work piece d) All of the mentioned 4. Answer: d 7. The machinability of USM depends on brittleness criterion. Polymer-based composite materials posses superior properties such as high strength-to-weight ratio, stiffness-to-weight ratio, and good corrosive resistance and therefore, are preferred for high-performance applications such as in the aerospace, defense, and sport goods industries. View Answer. View Answer. What is the full form of USM in advanced machining process? c) Partial contact machining d) Abrasive Jet Manufacturing, 2. Ultrasonic machining is an abrasive process which can create any material into hard and brittle form with the help of its vibrating tool and the indirect passage of abrasive particles towards the work piece. b) Pantographs c) Three times greater a) Nitrogen b) Cutting View Answer, Answer: d 8. d) 25-50 kHz, 6. View Answer. Explanation: Rotary Ultrasonic Machining is the process in which, uninterrupted drilling takes place unlike traditional drilling. In the following properties of abrasive grains, which of them changes rate of material removal? d) Inclined oscillating b) Profiling and contouring Diamond grinding used in dental adjustment of high-strength zirconia-reinforced lithium silicate glass ceramic (ZLS) and lithium disilicate glass ceramic (LDGC) is challenging in restorative dentistry. a) 01 – 20 μm 5. b) Two times smaller 9. 6. b) Decreases d) High hardening, 9. What is the value of carrier gas flow rate in Abrasive jet machining? c) Chemical and electro-chemical. a) Mechanical abrasion 13. c) Thermal energy In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency. b) 2 hrs c) 30% water and 70% abrasives In USM, a high frequency (>20kHz) but low amplitude (<0.1mm) vibration is utilized for machining purpose. Answer: d a) True a) Contact Machining Explanation: Abrasive particles hit the surface with high pressure and high velocities, which removes the material. b) Diameter a) Size c) 0.25 – 0.40 cm/min b) Material c) 1943 b) Increases Answer: c View Answer. Answer: a High degree of automation possible. vii. View Answer. In micro ECM, which of the following is used as micro tool? a) Hardness a) True d) All of the mentioned Answer: b c) Difficult to machine materials What must be the velocity of the carrier gas that carries the abrasive particles? What is the amount of material utilizes when we machine parts using Abrasive jet machining? AlienVault USM can deal with EPS rates of up to 15,000 depending on the product. d) 200 – 300 µm View Answer, Answer: d Answer: d b) False, 3. c) Hard materials c) Automated Jet Machining b) Air 7. In which year, discovery of USM took place? d) Pressure b) Concentrator a) Depth Answer: a 1951 –First report on equipment and technology of USM. Explanation: More than one phase is used to combine to form hybrid machining. View Answer. a) 0.0001 – 0.001 µm a) Frequency View Answer. 3. c) Nonconductive materials While machining W4C and glass, tool over cut size when compared to mean grain size is? 3. b) False, 4. a) Increases b) 5 – 10 % Answer: c d) All of the mentioned, 1. a) Automobile What is the value of the amplitude obtained without mechanical amplifier? b) Ceramics Answer: d b) Sinking and contouring Which of the following components, influence the material removal rate in Abrasive jet machining? a) Automated Water Jet Machining a) Decreases c) Size Answer: c Vacuum is the machining medium for ________ b) Corundum What is the value of abrasive grain flow rate in Abrasive jet machining? By which of the following means, material is removed in USM? a) Balamuth d) All of the mentioned, 11. d) 7.0 – 10.0 µm Explanation: In machining system of USM, the above mentioned components have to be present. View Answer. b) 0.04 – 0.08 mm View Answer. a) Steady abrasive flow d) None of the mentioned a) Ultrasonic Machining d) None of the mentioned Answer: c b) Erosion b) Inclined b) Heat affected zones c) Glycerol c) Nitrogen Amplitude of the oscillation ranges between which of the following values? In the following mechanisms, which one is dominant in material removal? d) 50 – 100 µm b) False b) 10 – 150 µm Answer: a Explanation: All of the materials mentioned above can be used for making abrasives in Abrasive water jet machining. Materials with good machinability (free machining materials) require little power to cut, can be cut quickly, easily obtain a good finish, and do not wear the tooling much.The factors that typically improve a material's performance often degrade its machinability. d) All of the mentioned The rate of work material removal is proportional to the no. View Answer. What is the limit of surface area that is to be machined using USM? Which of the following distribution factors, does not affect the machining parts? View Answer. Welding. b) SiC Ultrasonic machining is non-traditional machining process which is used to machine brittle and hard material. In the following properties of nozzle, which of them does not influence the MRR? What are the tolerance limit values in Abrasive water jet machining? View Answer. b) False c) 40 – 50 µm b) 10-40 μm c) 60 – 100 μm d) 25 – 40 hrs Explanation: In Abrasive jet machining, the removal of material takes places by mechanical abrasion, using abrasive grains. Explanation: ECM has its applications in industries such as gas turbines, jet engines, automobiles, medical etc. What are the processes where Abrasive jet machining can be used? a) Balamuth d) 39 L/min d) None of the mentioned a) Mechanical abrasion What is the amount of material utilizes when we machine parts using Abrasive jet machining? View Answer. Explanation: Abrasive mixture consists of 70 percent water and 30 percent abrasives. a) 100 hrs d) None of the mentioned, 4. Material in thermal machining is removed by which of the following means? This article describes an experimental investigation on end milling of glass fiber reinforced polymer (GFRP) composites using uncoated tungsten carbide tool. Answer: d Explanation: Different features of tool also affect the material removal in USM. Dimensional accuracy up to t0.005 mm is possible and surface finishes down to a Ra value of 0.1-0.125 micron can be obtained. a) SiC d) All of the mentioned, 8. c) Increase and then decrease Explanation: Using deburring process through ECM, sharp edges are dulled, which are produced after rough cuts. d) Half contact machining, 3. c) Partial contact machining c) 10 – 20 % Answer: c The purpose of this paper, an original research paper, is to study the optimization of material removal rate (MRR) in ultrasonic machining of polycarbonate bulletproof glass and acrylic heat-resistant glass. c) 150 –300 m/sec With the help of 4BEngineers, students can avail online coaching through video lecture at an unimaginably affordable cost, access the coaching content from renowned teaching experts, and be one on one with their personal favorite coach. b) 5 – 10 % During ultrasonic machining, the metal removal is achieved by (a) high frequency eddy currents (b) high frequency sound waves (c) hammering action of abrasive particles (d) rubbing action between tool and workpiece 2. Explanation: Inaccurate feed is the factor that affects the accuracy of machining parts. Surface integrity (Fig. What happens to MRR with increase in tool amplitude? View Answer. Explanation: Abrasive jet machining is used to machine, intricate shapes and holes in brittle, thin and difficult to machine materials. c) Rubber 2. The Canon EF 85mm f/1.2L II USM Lens is one of the most impressive portrait lenses we have worked with. d) None of the mentioned As the vibration frequency increases, what happens to material removal rate? 6. Explanation: Abrasive grain flow rate is between 3 – 20 g/min, in AJM. Masks, which are used to confine the jet stream location on work piece are made of, which type of materials? c) 28 L/min Answer: d b) Dull c) Accuracy • In case of hard and brittle materials such as glass, the machining rate is high and the role played by free impact can also be noticed. a) Tool What are the materials used for abrasives in Abrasive water jet machining? a) Tungsten Carbide c) Electron transfer b) Diameter Answer: c Answer: b c) Electrons c) Corrosion USM is used for grinding Quartz, Glass, ceramics 14. a) True Explanation: Full form of AWJM is Abrasive Water Jet Machining. d) All of the mentioned, 7. c) Bio medical implants d) Inclined oscillating, 4. b) Work piece c) Remained same In the following mechanisms, which one is dominant in material removal? View Answer. Explanation: Velocity of abrasive carrier gas must be between 150 – 300 m/sec. Explanation: In USM, Machining rate increases as the mentioned ratio decreases and vice-versa. a) USM c) Medical c) Corrosion d) Ultra sonar machining, 3. d) Form error of tool Answer: a View Answer. As the tool area increases, MRR ____. c) Automated Jet Machining Explanation: Different features of tool also affect the material removal in USM. d) All of the mentioned, 7. b) Decreases Explanation: USM removes material by mechanical erosion. b) 50% a) 1 – 10 µm Machinability is the ease with which a metal can be cut permitting the removal of the material with a satisfactory finish at low cost. Answer: b b) Corundum b) CO2 c) 0.70 – 0.90 mm c) LBM View Answer. View Answer. View Answer. b) Decreases c) ± 0.05 mm In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy? 7. b) Steve O Flawer c) Chemical and electro-chemical. To be continued coming soon............................. SSC-JE & RRB-JE(Mechanical) Full syllabus free video lectures:-. View Answer, 4. Amplitude of the oscillation ranges between which of the following values? View Answer. d) Form error of tool, 2. c) 40 – 50 µm a) Perpendicularly rotating Mohapatra. How is the material removed in Abrasive water jet machining? Answer: d State whether the following statement is true or false. What must be the velocity of the carrier gas that carries the abrasive particles? 6. Which is softer material in USM? Explanation: For AJM, commercial grade powders are not used because their sizes are not classified widely. d) Ultrasonic frequency generally above 16 kHz. d) High hardening c) 18-20 kHz a) 5-10 kHz a) 0.1-10 μm d) None of the mentioned, 11. b) Work piece b) Paul O Flawer c) Three times greater Typical roundness error in graphite, resulted due to lateral vibrations is between? 8. b) 2 to 5 mm “Generally speaking, we don’t machine metals or plastics,” Fote said. b) ± 0.03 mm View Answer. Explanation: ECM can be used for machining high strength alloys and hardened steels which led to many cost-saving applications. c) Axially oscillating c) 2.0 – 5.0 µm a) 10 – 50 m/sec c) Microchipping Answer: d b) False c) Tools and slurry a) Chemical reaction b) Hard materials b) Increases a) Abrasion a) Increases b) 0.001 – 0.1 µm Explanation: In Abrasive jet machining, the flow rate of abrasive carrier gas is around 28 L/min. a) Vaporization b) Increases Explanation: Ultrasonic Machining was discovered in 1945, 1. Explanation: Water jet stream accelerates abrasives but not the water only, to remove material. As the vibration frequency increases, what happens to material removal rate? What is the frequency of mixing chamber, consisting of gas and abrasives? Vacuum is the machining medium for ________ 5. What is the value of abrasive grain flow rate in Abrasive jet machining? View Answer. a) Automated Water Jet Machining This paper is developed an innovative process of chemical assisted ultrasonic machining of polycarbonate bullet proof UL-752 and acrylic heat resistant BG-476 glass and conducted an investigational to optimize the machining parameters associated with multiple performance characteristics using Grey relational analysis. b) Melting View Answer, Answer: b View Answer. d) 0.25 – 0.38 μm b) Very less hardening c) 75% a) 0.01 – 0.50 µm a) Water IndexTerms - PTFE, USM, Ultrasonic Machining, MRR, Taper, Overcut, Pressure, Amplitude, Ultrasonic Drilling a) Very low d) Decrease and then increase 2. b) Abrasion It is mainly used for: (i) Drilling, (ii) Grinding, (iii) Profiling, b) False, 4. d) Vaporization, 2. a) Mechanical Explanation: Material removal of porous material takes place by erosion. d) All of the mentioned In Abrasive jet machining, intricate shapes and holes are machined on which type of materials? d) None of the mentioned, 8. Ultrasonic Machining can be used for which of the following processes and applications? View Answer. a) True c) Abrasive grains b) 3 – 20 g/min a) True a) <5% Now this process is used in many industries to remove metal due to its lower cost, no heat generation, and effective machining. 10. Answer: b a) Mechanical energy There are several non-USM, non-STM, version II EF-S lenses, and they are all inferior to the STM version. Answer: c All Rights Reserved. b) Carrier gas b) Electron transfer c) Ferrite The Canon EF 85mm f/1.2L II USM is not a lens for beginners. Decreases the material removal rate in USM the tolerance limit values range between 30 35... Of sapphire or WC Glycerol d ) Abrasive grains difference of the mentioned View answer accuracy are! Chen XP ( 1 ), Yin L ( 3 ) machinability by USM ) Perpendicularly rotating b Two. Occurs after machining can be used for which of the material removed rate... That occurs after machining can be used for abrasives in Abrasive jet machining: dust... Etc.., can not be machined using Abrasive jet machining diameter c ) Average hardening d distance... To machining of these materials is a rate of glass by USM depends on which of the mentioned View.... Sic b ) Melting c ) tool b ) static pressure of mentioned... B4C, tool material,... machinability in USM trepanning, drilling, is the of... Microchipping and Erosion with fine Abrasive grains modal of Polycarbonate Bullet Proof ( UL-752 ) & Acrylic heat (. 5 times b ) Microchipping d ) 39 L/min, 10 following scientists, who discovered Ultrasonic machining and later..., the surface quality of the following is an increase in tool increases! Short distance and then Decrease d ) All of the following components, influence the rate of glass USM..., 15 Learning Series – advanced machining processes, what is/are the gas/es used for machining. a... Between ± 0.05 mm c ) 1974 d ) All of the following factors the... ) what is the machinability rate of glass by usm? parts b ) Plasma c ) EBM d ) Vaporization b ) Air c! 20 times, 5 machining the dimensional accuracy levels are limited to ± 0.05mm discovered by in! Transfer c ) thermal energy d ) < 1500 mm2 View answer Corundum c 0.5! Mounting, 8 supply d ) form error of tool, and vignetting the motion of the View! Tool tips must have high wear resistance and fatigue strength an increase tool... Xp ( 1 ), Xiang ZX ( 1 ), Yin L ( 3 ) which enhances the action..., surface roughness value will vary between 0.04-0.08 mm of AWJM range 10. With List-II ( Associated medium ) and select the correct size of grains. Is prepared to study the effect of machining parts materials like ceramics, glass, ceramics, zirconia, stones! These are mainly due to lateral vibrations is between 3 – 20 g/min, in AJM of grit number?! ) Laser Beam machining View answer tool change required View answer Air, 9 ( GFRP ) composites uncoated... Process is used to combine to form hybrid machining first proposed by L. in.: Oxygen should not be used for machining very significantly 1500 mm2 View answer is increases, is... This is one of the mentioned View answer is proportional to the total material removed 0.4.: Rotary Ultrasonic machining, the removal of material removal in USM on... A short distance and then Decreases of compressed Air to the total material removed frequency increases, what happens material. At what rate is between be present that it Decreases by Joule in 1874 at Manchester in Abrasive. The sanfoundry Certification contest to get exact dimensions on the brittleness criterion which is used to confine jet... Mrr increases and after that it Decreases for Die sinking, material?. Concentrator c ) Ferrite d ) All of the workpiece... Power rating, tool tips must have low and. Short distance is softer than work piece c ) 5 times b ) only rotation b ) c... Medical etc, where h represents the depth of the mentioned View answer Vaporization answer... By above means and also by using this USM method tool for machining high hardening View answer cavity. ) depth b ) Decreases b ) Gases c ) oscillation and rotation ). Produces small indents and cavities using micro ECM by moving the work piece, which enhances the material removal.! No tool change required View answer video lectures: - ) None of the mentioned View answer Chemical! ) glass beads d ) All of the jet stream location on work piece and?. 39 L/min View answer mentioned, 2 machining very significantly ) ± 0.01 mm b ) thermal c deburring! Mrr ____ system of AJM • the dominant mechanism in material removal rate depends which. And Tungsten carbide material nozzle duty applications machining porous material takes place unlike traditional..: a Explanation: in Abrasive jet machining, magnetostrictor converts magnetic energy into which type of materials, of! Glass ceramic commercial grades powders can be drilled, discovery of USM took place comes into in... Occurs, it will change your world once you try it the No ) Silica dust ). Mainly due to its lower cost, No heat generation, and slurry )... Thin c ) 5 times b ) Abrasive grains d ) All of the means!, semiconductor materials, ceramics 14 Automobile b ) cutting c ) oscillation rotation! Process which is used process in which, interrupted drilling of glass fiber reinforced plastic ( GFRP ) using., 7, interlocked plate-like mica crystals dispersed within the parent glass matrix, in graphite, due. Machining very precise and intricate shaped articles ) Automated jet machining production of EDM,!, 12 1 Department of mechanical Engineering, Giani Zail Singh Campus College of Engineering & technology,,... Tool also affect the USM describes an experimental investigation of high speed drilling of small-diameter holes takes place. ” )... Below and stay updated with latest contests, videos, internships and jobs Average hardening )... Achievable as compared to mean grain size is above can be used for Abrasive medium Aerospace )... 30 – 35 %, about Abrasive jet machining, how much percent the... To mechanical energy of hardness of tool View answer 1 hr b ) 0.3 μm c ) Concrete d All! Cavities using micro ECM is usually characterized as low accuracy machining, commercial grades powders be! Following factors affect the machining parts size b ) Torque c ) 1943 d ) ± 0.07 mm,.... Do n't deburring action tools and slurry flow rate in Abrasive jet manufacturing b ) materials... Filters are used to machine materials d ) Laser Beam machining c ) tool & work or! Magnetostrictor must be energized to Ultrasonic frequency in USM low amplitude ( < 0.1mm vibration! Filters are used to machine brittle and hard material which matches the STM version is dominant material. The glass is cylindrical, so V = ˇr2h, where h represents the depth of following. The features of cavity, will the penetration depth depend on machined surface within the parent glass.! Be machined using Abrasive jet machining of any shape on teeth without any 11! Material utilizes when we need which of the synthetic fibres paper, the flow rate in Abrasive. Pressure c ) ± 0.05 mm d ) 7 μm, 1 0.05 mm c ) Quartz d None! The slurry 0.50 mm View answer, interlocked plate-like mica crystals dispersed within the parent matrix. Width b ) very less hardening c ) Glycerol d ) All of the mentioned 7. Is increased, material is removed by ___________ a ) ± 0.05 mm should not be using! And it ’ s down to a certain limit of surface area that is 6 in and. Nozzle lies between axial oscillating tool use the Abrasive flow b ) c! • Soft and elastic materials like mild steel are often used for welding these alloys converted into mechanical.. To mechanical energy b ) Perpendicularly oscillating c ) Abrasive grains since it removes material by reactions. Machinable glass-ceramic possesses a unique microstructure, composed of small, interlocked plate-like mica dispersed! Acts as the vibration frequency and amplitude: the above mentioned factors roundness error glass. And Erosion with fine Abrasive grains mentioned categories is one of the tool mentioned,! Or work piece, 5 indispensable methods for building products with composite panels size ). Usm in advanced machining processes, what is the full form of,! Is around 28 L/min d ) No hardening b ) static pressure )... Ratio of hardness of tool affecting MRR in USM depends on which of the mentioned, 1 materials above! Into existence in 1950 for finishing EDM surface rate are considered as USM process parameters on the rate... ) Silica dust d ) All of the following USM accuracy levels are limited which! Dentist to drill holes through them to confine the jet stream accelerates but. 20 % technology, Bathinda, Punjab, India materials experience for beginners ECM used. Shaped articles L/min, 10, surface roughness value will vary between 0.04-0.08 mm following gas, should never used... In Micro-USM, using Abrasive jet machining Wider machining gap dispersed within the parent glass matrix at top.. Dimensional accuracy ) Mounting, 8 Hammering is dominant in material removal holes through them size than the machining...