Leadscrew Assemblies | Lintech
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Manufacturing Processes
Module 1 Classification of Metal Removal Processes and Machine tools Version 2 ME IIT, Kharagpur Lesson 2 Basic working principle, configuration, specification and classification of machine tools Version 2 ME IIT, Kharagpur Instructional Objectives At the end of this lesson, the students should be able to : (a) Describe the basic functional principles of machine tools (i) Illustrate the concept of Generatrix and Directrix (ii) Demonstrate Tool – work motions (iii) Give idea about machine tool drives (b) Show configuration of basic machine tools and state their uses (c) Give examples of machine tools - specification (d) Classify machine tools broadly. Basic functional principles of machine tool operations Machine Tools produce desired geometrical surfaces on solid bodies (preformed blanks) and for that they are basically comprised of; • Devices for firmly holding the tool and work • Drives for providing power and motions to the tool and work • Kinematic system to transmit motion and power from the sources to the tool-work • Automation and control systems • Structural body to support and accommodate those systems with sufficient strength and rigidity. For material removal by machining, the work and the tool need relative movements and those motions and required power are derived from the power source(s) and transmitted through the kinematic system(s) comprised of a number and type of mechanisms. (i) Concept of Generatrix and Directrix • Generation of flat surface The principle is shown in Fig. 2.1 where on a flat plain a straight line called Generatrix (G) is traversed in a perpendicular direction called Directrix (D) resulting a flat surface. • Generation of cylindrical surfaces The principles of production of various cylindrical surfaces (of revolution) are shown in Fig. -
Leveling the Head the Head of the Carvewright Machine Can Be Moved up Or Down to Accommodate Different Material Thicknesses
Leveling the Head The head of the CarveWright machine can be moved up or down to accommodate different material thicknesses. It is guided vertically by four guide posts located at the corners of the machine and driven by a leadscrew on either side of the machine located between the posts. The leadscrew adjacent to the keypad is driven by the crank and it is tied rotationally to the opposite leadscrew by the long tierod located in the base of the machine. It is critical that the head is level at all times or it will bind and become difficult to move up and down. While extremely rare, the head can become unlevel for several reasons. The cause behind the loss of head level needs to be understood before the machine repair is completed. Common causes for loss of head level are: a loose leadscrew nut, a stripped gear between the end of the tierod and leadscrew, or a broken base that allows the tierod to become disengaged from one of the leadscrews. To level the head you will need the following tools: • #2 Phillips screwdriver bit and drill • 10mm Socket and ratcheting wrench • Large Crescent wrench (2X) 1. Ready the machine. Unplug the machine from the power outlet and place it on a stable work platform. Raise the head up several inches and move the Y-truck to the center of the machine for best access. Remove the dust collection bag from the back of the machine. 2. Adjust the head height. Crank the head up toward the top of the machine. -
NSK Ball Screws for High-Load Drive NSKTAC Series of Ball Screw Support Bearings for High-Load Applications NSK Roller Guide RA Series
NSK Ball Screws for High-Load Drive NSKTAC Series of Ball Screw Support Bearings for High-Load Applications NSK Roller Guide RA Series We have developed easy-to-use ball screws for high-load applications and now offer a wide variety of products suited for high-load drives. These ball screws enable the electric servo drive to operate under the most severe conditions. NSK Ball Screws for High-Load Drive Lineup of NSK Ball Screws HTF-SRC Type P13 for High-Load Drive Enables a maximum speed of 930 … mm/s with fine screw leads. P16 Best suited design for high-load applications The best arrangement of the ball recirculation circuits and use of the largest possible ball have significantly contributed to the enhancement of high-load HTF-SRD Type P17 bearing characteristics. (Refer to pages 6 and 7 for details.) Enables a maximum speed of 1 600 … mm/s with coarse screw leads. P20 Equipped with Grease Retaining A1 Seals P21 … Optimized design of A1 seal enables P26 Large superior grease retaining performance. HTF-SRD HTF-ASRC Type HTF-ASRD Type HTF-ASRD HTF-SRE HTF-SRE Type P27 … To speed up large machinery. P28 Lead mm HTF-SRC HTF Type P29 HTF Screw diameters of 32 to 200 mm Leads of 10 to 32 mm … HTF-ASRC Provides a wide range of screw P38 diameter and lead combinations. Peripheral products for high-load drive ball screws NSKTAC series of ball screw P39 support bearings … P42 P Small 43 NSK roller guide RA series … Small Shaft dia. mm Large P44 As well as long shafts, a variety of shaft end configurations are available for high torque transmission. -
Leadscrew Brochure
• High Repeatability • High accuracy • Short Lead times • Fast Prototyping High Precision Lead Screws Offering smooth, precise, cost effective positioning, lead screws are the ideal solution for your application. Thomson Neff precision lead screws from Huco Dynatork are an excellent economical solution for your linear motion requirements. For more than 25 years, Thomson has designed and manufactured the highest quality lead screw assemblies in the industry. Our precision rolling proc- ess ensures accurate positioning to .075mm/300mm and our PTFE coating process produces assemblies that have less drag torque and last longer. Huco Dynatork provides a large array of standard plastic nut assemblies in anti-backlash or standard Supernut® designs. All of our standard plastic nut assemblies use an internally lubricated Acetal providing excellent lubricity and wear resistance with or without additional lubrication. With the introduction of our new unique patented zero backlash designs, Huco Dynatork provides assemblies with high axial stiffness, zero back- lash and the absolute minimum drag torque to reduce motor requirements. These designs produce products that cost less, perform better and last longer. Both designs automatically adjust for wear ensuring zero backlash for the life of the nut. Huco Dynatork also provides engineering design services to aid in your design requirements producing a lead screw assembly to your specifica- tions. Call Huco Dynatork today on 01992 501900 to discuss your application with one of our experienced application engineers Huco Dynatork Products Deliver Performance To ensure precise positioning, the elimination of backlash is of primary concern. Several types of anti-backlash mechanisms are common in the market which utilise compliant pre- loads. -
Ball Screw Motors the BE Series Products Are Designs Based on the Technology of Hybrid Step Motors, Ball Screws and Nuts
BE SERIES Ball Screw Driven Linear Actuators Ball Screw Motors The BE Series products are designs based on the technology of hybrid step motors, ball screws and nuts. Provide high torque, high precision, and high efficiency to fit the application needs of designers. The combination of motor styles, motor sizes, ball screws and nuts, gives the freedom to use motors of different form factors to exactly fit in the application. • Five frame sizes: NEMA 08, 11, 14, 17, 23 • Multiple motor lengths and motor sizes • Each frame size motor has a variety of lead options • Each frame size motor has a variety of nut options The integrated ball screw actuators from PBC Linear provide a high quality innovate solution for high speed applications. Features of BE Series 100 µ=0.003 µ=0.005 The ball screws of BE Series have outstanding 90 µ=0.008 µ=0.010 transmission efficiency of over 90%. Their required Ball screw 80 torque is just less than a third of what the lead screws Rotary Linear require. Therefore, it is easier to transfer a linear motion 70 into a rotary motion. µ=0.1 60 Efficiency η 50 (%) µ=0.2 Efficiency of ball screws Rotary Linear 40 µ=0.3 Acme screw 30 2 1 × T (Trapezoidal Normal operation P= screw thread) 20 T= Load torque kgf x cm 10 P= Axial external load kgf µ: Coefficient of friction = lead cm 012345678 9 10 Lead angle (degree) 1 = Efficiency of ball screws Mechanical efficiency of ball screws The all screws of the BE eries adopt a othicarch groove profile, its aial clearance can be adusted in a hihly fine pitch as well as it can be lihtly rotated. -
Roller Screws
1213E_MSD_EXCO 1/11/06 10:06 AM Page 37 SIZEWISE Edited by Colleen Telling Sizing and applying ROLLER SCREWS Gary Shelton Roller screw shaft Principal Design Engineer Ground shaft Exlar Corp. Timing gear planetary Chanhassen, Minn. Roller screw nut roller screw How it works Roller screws convert ro- tary motion into linear mo- Roller screws’ tion just like acme and numerous ballscrews. Comparably contact points sized roller screws, however, vs. ballscrews’, have better efficiency than lengthen their acme screws and can carry lives and Spacer larger loads than ballscrews. washer increase load In addition, they can cycle Roller timing gear capacity and more often and turn signifi- stiffness. They Roller cantly faster than either, contain ground suiting them to precise, con- Retaining clip leadscrews for high- tinuous-duty applications. Roller journal precision applications Radiused flanks on the and come in tolerance rollers deliver point contact classes G1, G3, G4, and G5. like balls on a raceway, and only the radius is part of the profile. Therefore, a larger radius transversely and a precision- and additional contact points can ground spacer is inserted be- be packed into the available tween the front and back halves. space, thus lowering stress. In ad- The double nut is another alter- dition, the rolling contact be- native. As the name suggests, it tween components has low fric- uses two nuts preloaded against tion, yielding high efficiency. Be- each other on one screw. There is cause the rolling members are no sacrifice of life for its de- fixed relative to each other and creased backlash, but the double never touch adjacent rollers, nut costs more than standard sin- roller screws can turn at speeds gle-nut arrangements. -
Manufacturing Glossary
MANUFACTURING GLOSSARY Aging – A change in the properties of certain metals and alloys that occurs at ambient or moderately elevated temperatures after a hot-working operation or a heat-treatment (quench aging in ferrous alloys, natural or artificial aging in ferrous and nonferrous alloys) or after a cold-working operation (strain aging). The change in properties is often, but not always, due to a phase change (precipitation), but never involves a change in chemical composition of the metal or alloy. Abrasive – Garnet, emery, carborundum, aluminum oxide, silicon carbide, diamond, cubic boron nitride, or other material in various grit sizes used for grinding, lapping, polishing, honing, pressure blasting, and other operations. Each abrasive particle acts like a tiny, single-point tool that cuts a small chip; with hundreds of thousands of points doing so, high metal-removal rates are possible while providing a good finish. Abrasive Band – Diamond- or other abrasive-coated endless band fitted to a special band machine for machining hard-to-cut materials. Abrasive Belt – Abrasive-coated belt used for production finishing, deburring, and similar functions.See coated abrasive. Abrasive Cutoff Disc – Blade-like disc with abrasive particles that parts stock in a slicing motion. Abrasive Cutoff Machine, Saw – Machine that uses blade-like discs impregnated with abrasive particles to cut/part stock. See saw, sawing machine. Abrasive Flow Machining – Finishing operation for holes, inaccessible areas, or restricted passages. Done by clamping the part in a fixture, then extruding semisolid abrasive media through the passage. Often, multiple parts are loaded into a single fixture and finished simultaneously. Abrasive Machining – Various grinding, honing, lapping, and polishing operations that utilize abrasive particles to impart new shapes, improve finishes, and part stock by removing metal or other material.See grinding. -
3657 SIMPLE MACHINES: INCLINED PLANE, WEDGE and SCREW Grade Levels: 7-12 15 Minutes CAMBRIDGE EDUCATIONAL 1998
#3657 SIMPLE MACHINES: INCLINED PLANE, WEDGE AND SCREW Grade Levels: 7-12 15 minutes CAMBRIDGE EDUCATIONAL 1998 DESCRIPTION Uses animated graphics and real examples to illustrate an inclined plane, wedge, and screw. Offers a definition of each and examines the relationship between the three. Shows how they have been used historically. Also defines simple machines and mechanical advantage. Reviews main concepts. ACADEMIC STANDARDS Subject Area: Science ¨ Standard: Understands motion and the principles that explain it · Benchmark: Knows the relationship between the strength of a force and its effect on an object (e.g., the greater the force, the greater the change in motion; the more massive the object, the smaller the effect of a given force) · Benchmark: Knows that when a force is applied to an object, the object either speeds up, slows down, or goes in a different direction Subject Area: Historical Understanding ¨ Standard: Understands and knows how to analyze chronological relationships and patterns · Benchmark: Knows how to construct time lines in significant historical developments that mark at evenly spaced intervals the years, decades, and centuries · Benchmark: Knows how to identify patterns of change and continuity in the history of the community, state, and nation, and in the lives of people of various cultures from times long ago until today AFTER SHOWING 1. Point out objects in the classroom that incorporate inclined planes, wedges and screws. 2. Dissect a toy or household gadget. Record progress in science notebooks with written notations and drawings. Identify each part as to type of simple machine and function. 3. Study the history of simple machines. -
Exhibits Profile Please Search Your Product Name by "Ctrl+F" Function.Or Click for Keywords Searching
Exhibits Profile Please search your product name by "Ctrl+F" function.Or click https://code.taitra.online/ for keywords searching. 產品代碼 英文名稱 52 Mineral & Metallurgy 5210 Energy Minerals 521010 Coal 521020 Petroleum 521030 Charcoal 521040 Natural Gas 521050 Industrial Gas 5220 Metallic Ores 522010 Iron Ore 522020 Copper Ore 522030 Aluminum Ore 522040 Manganese Ore 522050 Titanium Ore 522060 Zirconium Ore 522070 Gold Ore 522099 Other Metallic Ore 5230 Non-Metallic Minerals 523005 Graphite 523010 Sulfur 523015 Sea Salt 523020 Fluorite 523025 Limestone 523030 Dolomite 523035 Quartz 523040 Feldspar 523045 Mica 523050 Talc 523055 Kaolin 523060 Bentonite 523065 Gypsum 523070 Clay 802570 Other Water Sports 523099 Other Non-Metallic Mineral 5240 Iron & Steel 524005 Billet & Slab 524010 Steel Bar & Rebar 524015 Wire Rod, Iron & Steel Wire 524020 Steel Sheet & Profile 524025 Steel Pipe & Tube 524030 Wire Rope 524035 Steel Coil & Strip 524040 Steel Rail 524045 Iron Pipe 524050 Ferro Alloy 524055 Wire Mesh 524060 Scrap Metal 5250 Non-ferrous Metals 525005 Ingot 525010 Aluminum Sheet 525015 Aluminum Bar & Tube 525020 Aluminum Extrusion 產品代碼 英文名稱 525025 Copper Sheet 525030 Copper Bar & Tube 525035 Titanium Sheet 525040 Titanium Bar & Tube 525045 Non-ferrous Wire 525050 Electromagnet / Solenoid 525055 Permanent Magnet 525060 Rare Earth 525099 Other Non-ferrous Metals 53 Chemicals 5305 Organic Chemicals 530510 Amine 530520 Aldehyde, Ketone & Chinone 530530 Organic Acid 530540 Alcohol, Hydroxybenzene & Ether 530550 Benzene & Derivatives 530560 Hydrocarbon -
Spur and Straight Bevel Gears
FUNdaMENTALS of Design Topic 6 Power Transmission Elements II © 2000 Alexander Slocum 6-0 1/25/2005 Topic 6 Power Transmission Elements II Topics: • Screws! • Gears! www.omax.com © 2000 Alexander Slocum 6-1 1/25/2005 Screws! • The screw thread is one of the most important inventions ever made • HUGE forces can be created by screw threads, so they need to be carefully engineered: – Leadscrews – Physics of operation –Stresses – Buckling and shaft whip – Mounting • When HUGE forces are created by screws – The speed is often slow – Always check to make sure you get what you want Mike Schmidt-Lange designed this auger-wheeled vehicle for the “sands” of 1995’s 2.007 contest Pebble Beach, and – If you try sometime, you just might get what you need ☺ years later, a major government lab “invented” the idea as a Mars rover sand-propulsion device… Someday, apples will be so plentiful, people will need machines to peel © 2000 Alexander Slocum 6-2 them…!1/25/2005 Screws: Leadscrews & Ballscrews • Leadscrews are essentially accurate screws used to move a nut attached to a load, and they have been used for centuries to convert rotary motion into linear motion – Leadscrews are commonly used on rugged economy machine tools – Efficiency in a leadscrew system may be 30-50%, • Precision machine or those concerned with high efficiency often uses a ballscrew – Sliding contact between the screw and nut is replaced by recirculating ball bearings and may have 95% efficiency Carriage Rotary Encoder AC Brushless Motor Flexible Coupling Support Bearings Bearing -
Rolled Rotary Ball Screw
511E Rolled Rotary Ball Screw Model BLR End cap Screw shaft Spacer Ball Seal Collar End cap Outer ring Ball screw nut Retainer Outer ring Ball Fig.1 Structure of Large Lead Rotary Nut Ball Screw Model BLR Point of Selection A15-8 Options A 15-336 Model No. A 15-353 Precautions on Use A 15-358 Accessories for Lubrication A 24-1 Mounting Procedure and Maintenance B 15-104 Accuracy Standards A 15-290 Example of Assembly A 15-291 Axial Clearance A 15-19 Maximum Length of the Screw Shaft A 15-24 DN Value A 15-33 A15-288 511E Rolled Rotary Ball Screw Structure and Features The Rotary Ball Screw is a rotary-nut ball screw unit that has an integrated structure consisting of a ball screw nut and a support bearing. The support bearing is an angular bearing that has a contact angle of 60, contains an increased number of balls and achieves a large axial rigidity. Model BLR is divided into two types: the Precision Ball Screw and the Rolled Screw Ball. [ Smooth Motion] It achieves smoother motion than rack-and-pinion based straight motion. [ Low Noise even in High-speed Rotation] Model BLR produces very low noise when the balls are picked up along the end cap. In addition, the balls circulate by passing through the ball screw nut, allowing this model to be used at high speed. [ High Rigidity] The support bearing of this model is larger than that of the screw shaft rotational type. Thus, its axial rigidity is signifi cantly increased. -
Oscillatory Motion Leadscrews • for Applications Requiring Linear Oscillatory Motion Over a Fixed Path
© 1994 by Alexander H. Slocum Precision Machine Design Topic 21 Linear motion actuators Purpose: This lecture provides an introduction to the design issues associated with linear power transmission elements. Major topics: • Error sources • Belt drives • Rack and pinion drives •Friction drives • Leadscrews • Linear electric motors "...screw your courage to the sticking-place, And we'll not fail" Shakespeare 21-1 © 1994 by Alexander H. Slocum Error sources: • There are five principal error sources that affect linear actuator' performance: • Form error in the device components. • Component misalignment. • Backlash. • Friction. • Thermal effects • These systems often have long shafts (e.g., ballscrews). • One must be careful of bending frequencies being excited by rotating motors. 21-2 © 1994 by Alexander H. Slocum Belt drives • Used in printers, semiconductor automated material handling systems, robots, etc. • Timing belts will not slip. • Metal belts have greater stiffness, but stress limits life: σ = Et 2ρ • Timing belts will be the actuator of choice for low cost, low stiffness, low force linear motion until: •Linear electric motor cost comes down. • PC based control boards with self-tuning modular algorithms become more prevalent. • To prevent the belts' edges wearing on pulley flanges: • Use side rollers to guide timing belt to prevent wear caused by flanged sheaves: load Guide roller Belt 21-3 © 1994 by Alexander H. Slocum Rack and pinion drives Motor Pinion Rack • One of the least expensive methods of generating linear motion from rotary motion. • Racks can be placed end to end for as great a distance as one can provide a secure base on which to bolt them.