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  • Characterizing the performance of dental air-turbine ...

    2008-1-1 · Although such particles are generated by polishing lathes, air-abrasive prophylaxis equipment, ultrasonic scalers, and air–water syringes, air-turbine handpieces are among the most prolific producers of aerosols. 103 About 95% of the particles in dental aerosols have a diameter of less than 5 µm 104, 105 and may be fully inhaled. 103–144 Larger particles may be carried considerable distances as ‘splatter’, …

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  • US6331217B1 - Turbine blades made from multiple

    The method allows for the production of large, high quality turbine blades by joining small, high quality cast superalloy sections, in comparison with prior attempts to cast large turbine blades as...

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  • Metal casting processes - IIT Guwahati

    2016-2-29 · Cleaning Cleaning involves removal of sand, scale, and excess metal from the casting. Burned-on sand and scale are removed to improved the surface appearance of the casting. Excess metal, in the form of fins, wires, parting line fins, and gates, is removed. Inspection of the casting for defects and general quality is performed.

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  • Autoclavable dental handpiece with disposable high

    1996-4-29 · A method of assembling a high-speed medical/dental handpiece, said handpiece including an autoclavable body, a disposable cartridge, and a dental bit removably receivable in said cartridge; said handpiece body having a sleeve, a head formed at an end of said sleeve, an air supply line, and a water supply line extending though said sleeve to be in fluid communication with said body head; said …

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  • Blades | Hexagon MI

    2018-1-1 · The aim of this paper is to investigate the fracture during bending test of Co-Cr dental bridges, produced by additive technologies. Three groups of samples (four-part dental bridges from 1-st premolar to 2-nd molar) were produced by conventional casting with handmade wax patterns, casting with 3D printed patterns and selective laser melting (SLM).

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  • Bending fracture of Co-Cr dental bridges, produced

    2021-7-23 · Blades. Accelerated Turbine Blade Measurement; High Throughput Aeroengine Blade Measurement Solution; Quality Assurance of Turbine Blades; Blisks. Non-Contact Measurement of Blisk Aerofoils and Gas Path Features; Castings. Optimising Precision Casting; Optimising Tension Rod Measurement; Gears. Fast and Documented Measurements of Hobs with Carbide Inserts

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  • Hexagon news mash up: July 2021

    1999-7-28 · Turbine blades 22 and turbine wheel 21 are designed to minimize friction losses from the fluid, therefore optimizing the conversion efficiency of mechanical to electrical energy. The material is also chosen to resist corrosion by therapeutic substances, chemicals applied during the treatment and any abrasive micro-particles small enough to pass through the micro-turbine engine.

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  • Dental laser treatment hand-piece and system -

    2021-7-26 · Sand casting involves several steps, including patternmaking, molding, melting and pouring, and cleaning. The pattern is the form around which the sand is packed, usually in two parts, the cope and the drag. After the sand is compacted enough to replicate the pattern, the cope is removed and the pattern extracted.

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  • Characterizing the performance of dental air-turbine ...

    2008-1-1 · The first air-powered dental engine design was patented in 1868 1 although in fact this was not a turbine but effectively a lobe pump operated in reverse. It was intended to be operated by mouth, foot bellows, or a compressed air vessel. The first true turbine dental handpiece, with a 13-bladed rotor, was patented in 1874, 2 with similar ...

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  • In vitro comparison of the cutting efficiency and ...

    2009-5-1 · Statement of problem. The cutting behavior of dental rotary cutting instruments is influenced by the handpiece used. While the turbine handpiece has been extensively tested in previous studies, limited published information exists on the use of rotary cutting instruments with the electric handpiece system and on possible interactions between rotary cutting instruments and handpiece type.

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  • Bending fracture of Co-Cr dental bridges, produced

    2018-1-1 · The aim of this paper is to investigate the fracture during bending test of Co-Cr dental bridges, produced by additive technologies. Three groups of samples (four-part dental bridges from 1-st premolar to 2-nd molar) were produced by conventional casting with handmade wax patterns, casting with 3D printed patterns and selective laser melting (SLM).

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  • Chapter 35 handpieces Flashcards | Quizlet

    this part of bur is cutting, polishing or finishing portion and manufactured in very many shapes and sizes. 1. preparing tooth. 2. excavating decay. 3. finish cavity walls. 4. finish restoration surfaces. 5. remove old fillings. 6. finish crown preps. .7. separate crowns and bridges. 8. …

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  • Long Live Your Engine | Chromalloy

    Welcome to Chromalloy. See Chromalloy in action around the world. Step inside and watch the Chromalloy value chain at work as we design, manufacture and repair parts that extend the lives of gas turbine …

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  • Buehler - Metallography Equipment & Supplies for

    Buehler is a manufacturer of metallographic testing equipment including scientific instruments & supplies for cross-sectional material testing. Buehler’s sectioning, mounting, grinding and polishing, imaging and analysis and hardness testing metallographic equipment along with consumables are used by metallurgical, metallography, petrography ...

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  • AL0993 Lesson # 8 - GlobalSecurity.org

    2005-4-27 · The power turbine rotor assembly, items 16 and 18 in figure 8.2, consists of the turbine shaft, first and second stage disk and blades, turbine coupling, and accessory drive gear. Tiebolts attach ...

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  • Providing assured combat readiness at a reduced cost.

    2019-11-4 · high pressure turbine blades in its F108 CFM56-2 engines. Chromalloy brings competition to this important area. Castings Chromalloy operates several state-of-the-art castings centers including a facility in Tampa, Florida that is the most technologically advanced in the world. These

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  • Understanding nonlinear vibration behaviours in high

    2015-4-8 · The term high-power ultrasonics (HPU) has been used historically to differentiate applications of ultrasound above a certain power or intensity threshold from those below the threshold. HPU applications include many ultrasonically assisted manufacturing processes, such as cleaning and welding, whereas low-power ultrasonics has defined ...

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  • US6331217B1 - Turbine blades made from multiple

    Large gas turbine blades made from separate cast segments of superalloys are disclosed. The turbine blade is designed such that bond lines between adjacent segments are placed in low stress regions of the blade. The cast superalloy segments of the blades are aligned and fitted together with specified tolerances. The turbine blade segments are then joined by transient liquid phase bonding ...

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  • (PDF) Stereolithography-Based Manufacturing of

    Aimed at solving the high cost and long manufacturing cycle of aircraft pre-research turbine blades, a rapid fabricating method for turbine blade based on stereolithography is proposed.

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  • The art of laser ablation in aeroengine: The crown

    2020-2-25 · Because turbine blades endure both low-cycle loads (centrifugal load and bending load) and high-cycle loads (aerodynamic load and vibration load) simultaneously, it is necessary to take both low-cycle loads and high-cycle loads, as well as their coupling effect into consideration in …

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  • Long Live Your Engine | Chromalloy

    Welcome to Chromalloy. See Chromalloy in action around the world. Step inside and watch the Chromalloy value chain at work as we design, manufacture and repair parts that extend the lives of gas turbine …

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  • Classification of Casting MCQ [Free PDF] - Objective ...

    Explanation:. Zinc Alloys are preferably cast by Die Casting.. Casting: It is a manufacturing process in which liquid material is filled into the mold, which contains a hollow cavity of the desired shape and then allowed to solidify. The solidified part is known as a casting, which injected or broken out of the mold to complete the process. Die Casting: Die casting is a manufacturing process ...

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  • All Manufacturing Standards - ASTM International

    2018-5-25 · A1095-15(2019): Standard Specification for High-Silicon Molybdenum Ferritic Iron Castings. A1098/A1098M-18: Standard Specification for Welded Austenitic, Ferritic, Martensitic and Duplex Stainless Steel Boiler, Superheater, Condenser, and Heat Exchanger Tubes with Textured Surface(s)

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  • Metal casting processes - IIT Guwahati

    2016-2-29 · The six basic steps in making sand castings are, (i) Pattern making, (ii) Core making, (iii) Moulding, (iv) Melting and pouring, (v) Cleaning Pattern making - Pattern: Replica of the part to be cast and is used to prepare the mould cavity. It is the physical model of the casting used to make the mould. Made of either wood or metal.

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  • The Use of High-speed Dental Units-Alandental.com

    Air driven high speed dental units provide cutting, polishing and other advanced functions. There are many types available on the market. In their simplest form, these units have an air compressor and three yokes, providing a high speed handpiece, a slow speed handpiece and an air/water syringe.They can be bought as mobile units, on castors, or as a wall mounted control panel, with a ...

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  • Aero Engine Turbine Blade Cooling Holes Inspection ...

    1996-4-29 · A high-speed medical/dental handpiece including a body comprising a sleeve and a head at an end of said sleeve; said head defining a chamber having a floor, a turbine rotatably received in said chamber, an opening in said chamber floor to allow for a bit to be inserted into said chamber, upper and lower bearings in said chamber; and a turbine ...

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  • Autoclavable dental handpiece with disposable high

    2012-11-1 · Kotzin (1981) stated that this process was used for several centuries for making jewellery, idols and art castings. Such jewellery castings have been found not only in the treasures of the Pharaohs of Egypt, Inca tombs of Central/South America, but also, in Europe, the ancient Etruscans, the Greeks, etc. Fig. 2 shows one such casting, the Byzantines investment-cast earring.

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  • Developments in investment casting process—A

    1999-7-28 · The housing of micro turbine generator 3 and turbine elements 21, 22, 23, 26 and 24 are made of a material that is dielectric and that can withstand the high pressure applied by the passing fluid. Turbine blades 22 and turbine wheel 21 are designed to minimize friction losses from the fluid, therefore optimizing the conversion efficiency of ...

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  • Additive at Scale: Avio Aero Flies into the Future | GE ...

    this part of bur is cutting, polishing or finishing portion and manufactured in very many shapes and sizes. 1. preparing tooth. 2. excavating decay. 3. finish cavity walls. 4. finish restoration surfaces. 5. remove old fillings. 6. finish crown preps. .7. separate crowns and bridges. 8. …

    Get Price
  • Chapter 35 handpieces Flashcards | Quizlet

    Welcome to Chromalloy. See Chromalloy in action around the world. Step inside and watch the Chromalloy value chain at work as we design, manufacture and repair parts that extend the lives of gas turbine …

    Get Price
  • Foundry Manual - Part 3 - Maritime

    2005-4-27 · The power turbine rotor assembly, items 16 and 18 in figure 8.2, consists of the turbine shaft, first and second stage disk and blades, turbine coupling, and accessory drive gear. Tiebolts attach ...

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  • Long Live Your Engine | Chromalloy

    2016-7-14 · • Low speed mainly used for cleaning teeth, occasional caries excavation, finishing and polishing procedures. Rotary Instruments in Operative Dentistry - Dr. Nithin Mathew 15 16. • At high speeds, the surface speed needed for efficient cutting can be attained by use of smaller and more versatile cutting instruments.

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  • AL0993 Lesson # 8 - GlobalSecurity.org

    2019-9-9 · Investment casting is also called precision casting. Its products are precise, complex and close to the final shape of the part. It can be used directly without processing or with little processing. It is an advanced technology with near net shape. Compared with the traditional sand casting process, the casting size is more accurate and the ...

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  • Rotary Instruments in Operative Dentistry

    2015-3-10 · High-Speed Handpiece-contd Uses of the high-speed handpiece Removes decay. Removes an old or faulty restoration. Reduces the crown portion of the tooth for the preparation of a crown or bridge. Prepares the outline and retention grooves for a new restoration. Finishes or polishes a restoration. Sections a tooth during a surgery.

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  • Investment Casting | Metal Casting Resources

    2021-7-16 · Option B. The turbine wheel has a shroud or duct which provides cooling air to the turbine blades. Option C. The turbine wheel is enclosed by a protective shroud to contain the blades in case of failure. Correct Answer is. The turbine blades are shaped so that their ends form a band or shroud. Explanation. Jeppesen A&P Powerplant Textbook 3-28.

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