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Lapping Plate
Lapping Plate 05M20.20 Patent Pending Lapping is the process of rubbing two surfaces together with an abrasive and a lubricant to improve the quality of at least one of the surfaces. Although lapping can be used to create fl at surfaces, in the context of woodworking, lapping better serves to minimize the roughness of a surface – known as surface conditioning. By minimizing the roughness in the sole of a plane, there is reduced friction between the plane and the workpiece, which in turn reduces abrasion. For blades or chisels, the cutting edge can be made sharper if both intersecting surfaces are free of scratches, even if the back of the blade isn’t perfectly fl at. Straight cutting edge on a lapped blade. Jagged cutting edge on a ground blade. Figure 1: A ground blade versus a lapped blade. Lapping can remove only small amounts of material. If the sole of your plane or the back of your blade is twisted, wavy or bowed, it will be necessary to sand or grind off the high points prior to lapping. Lapping is always performed with an abrasive oil slurry, which not only allows the object to slide Small Abrasive about the lapping plate (called a lap), but also Particles provides a means to remove abraded particles and worn abrasive. Oil Object Abraded Metal Lap Groove in Lap Large Abrasive Particles Figure 2: Lapping mechanics. 2 Important Notes The lapping plate is made of soft iron and will wear over time. These instructions provide information on how to ensure the lap remains fl at for a lifetime. -
Build a Plane That Cuts Smooth and Crisp Raised Panels With, Against Or Across the Grain – the Magic Is in the Spring and Skew
Fixed-width PanelBY WILLARD Raiser ANDERSON Build a plane that cuts smooth and crisp raised panels with, against or across the grain – the magic is in the spring and skew. anel-raising planes are used Mass., from 1790 to 1823 (Smith may to shape the raised panels in have apprenticed with Joseph Fuller doors, paneling and lids. The who was one of the most prolific of the profile has a fillet that defines early planemakers), and another similar Pthe field of the panel, a sloped bevel example that has no maker’s mark. to act as a frame for the field and a flat Both are single-iron planes with tongue that fits into the groove of the almost identical dimensions, profiles door or lid frame. and handles. They differ only in the I’ve studied panel-raising planes spring angles (the tilt of the plane off made circa the late 18th and early 19th vertical) and skew of the iron (which centuries, including one made by Aaron creates a slicing cut across the grain to Smith, who was active in Rehoboth, reduce tear-out). The bed angle of the Smith plane is 46º, and the iron is skewed at 32º. Combined, these improve the quality of cut without changing the tool’s cutting angle – which is what happens if you skew Gauges & guides. It’s best to make each of these gauges before you start your plane build. In the long run, they save you time and keep you on track. Shaping tools. The tools required to build this plane are few, but a couple of them – the firmer chisel and floats – are modified to fit this design. -
There's Metal in Those Hills Sheffield Was Once the Iron, Steel and Cutlery
There’s Metal in Those Hills Sheffield was once the iron, steel and cutlery capital of the world. The hills around Sheffield and Rotherham were full of raw materials like coal and iron ore that could be used in cutlery and blade production. Before we were Famous Sheffield and Rotherham became famous for manufacturing and production for four main reasons: crucible steel, stainless steel, electroplating and cutlery. Crucible Steel Benjamin Huntsman invented the crucible steel process. Before this process was invented, the quality of the steel was unreliable and slow to produce. Benjamin Huntsman’s invention allowed people to produce tougher, high-quality steel in larger quantities. Stainless Steel Harry Brearley began testing why rifles rusted and exploring ways to stop steel from rusting. He developed Stainless Steel which was much more rust resistant than the steel that had been used previously. Cutlery Sheffield and Rotherham have been connected to the production of cutlery since the 1600s. Sheffield was the main center of cutlery production in England outside of London. Sheffield became world famous for its production of high-quality cutlery. The moving story of Sheffield’s remarkable Women of Steel Yorkshire Post article 13th June 2020 The story of Kathleen, one of the last surviving Sheffield steelworkers from the war. When war broke out, the lives of the young women of Sheffield were turned upside down. With the men sent away to fight they had no choice but to step into their shoes and became the backbone of the city’s steel industry. Through hard graft and companionship in the gruelling, and often dangerous world of factory work, they vowed to keep the foundry fires burning. -
Technical Information
Technical Information ID and OD Circular and Helical Interpolation circular interpolation: Consists of a cutter rotating about its own axis circumference without any vertical shift during the operation. This while traveling in an orbiting motion about an ID or OD workpiece orbiting movement utilizes the “X” and “Y” axis. Inserts Face Mills End Mills ID circular interpolation OD circular interpolation helical interpolation: This application requires a milling machine with calculation of feed rate for circular and helical interpolation: three-axis control capability. The operation consists of a cutter rotating On most CNC machines, the feed rate required for programming about its own axis together in an orbiting motion about an ID or OD contour (circular or helical) milling is calculated based on the Die and Mold workpiece circumference in the “X” and “Y” plane. The circular centerline of the tool. When dealing with linear tool movement, the movement about the “X” and “Y” plane, with a simultaneous linear feed rate at the cutting edge and centerline are identical, but with movement in the Z-axis plane (which is perpendicular to the “X” and circular tool movement, this is not the case. “Y” plane), creates the helical movement. For example, the path from point A to point B on the envelope of the cylinder combines a circular Slotting movement in the “X” and “Y” plane with a linear movement in the “Z” calculate feed rate at the cutting edge: First calculate the tool feed direction. On most CNC systems, this function can be executed in two rate at the cutting edge with the following formula. -
United States Patent (19) 11 Patent Number: 5,001,957 Steckler 45 Date of Patent: Mar
United States Patent (19) 11 Patent Number: 5,001,957 Steckler 45 Date of Patent: Mar. 26, 1991 (54) OFFSET BANDSAW 3,668,961 6/1972 Blue ...................................... 83/820 76) Inventor: Edward T. Steckler, 124 Hershey Mill Primary Examiner-Hien H. Phan Rd., Apt. # A-1, Mountville, Pa. Attorney, Agent, or Firm-Buchanan Ingersoll; Michael 17554 L. Dever 21) Appl. No.: 279,664 57 ABSTRACT (22 Filed: Dec. 5, 1988 An offset bandsaw uses a drive pulley and a second pulley which is angularly offset from the first drive 51 int. C. .............................................. B27B 13/10 pulley. A bandsaw blade is formed by twisting the blade 52 U.S. C. ........................................ 83/792; 83/661; 360 before welding the two ends together to form a 83/817; 83/820 continuous belt. The combination of the offset rollers 58) Field of Search ................. 83/807, 817, 820, 661, and the 360' twist permit the bandsaw blade to follow a 83/792 more natural path which improves blade life. Rollers (56) References Cited may be provided intermediate the drive pulley and top U.S. PATENT DOCUMENTS pulley to position the bandsaw blade portions in the same plane. Alternatively one may provide a third or 1,461,004 7/1923 Napier ................................... 83/66 1,916,903 7/1933 Wine ...... ... 83/820 fourth pulley to create a precision saw which can cut 2,355,124 8/1944 Testo . ... 83/661 tight radii in a workpiece and make sizeable square cuts 3,390,598 7/1968 Sands et al. ... 83/820 through stock of any length. 3,474,693 10/1969 Wilkie et al.. -
The Economic Development of Sheffield and the Growth of the Town Cl740-Cl820
The Economic Development of Sheffield and the Growth of the Town cl740-cl820 Neville Flavell PhD The Division of Adult Continuing Education University of Sheffield February 1996 Volume One THE ECONOMIC DEVELOPMENT OF SHEFFIELD AND THE GROWTH OF THE TOWN cl740-c 1820 Neville Flavell February 1996 SUMMARY In the early eighteenth century Sheffield was a modest industrial town with an established reputation for cutlery and hardware. It was, however, far inland, off the main highway network and twenty miles from the nearest navigation. One might say that with those disadvantages its future looked distinctly unpromising. A century later, Sheffield was a maker of plated goods and silverware of international repute, was en route to world supremacy in steel, and had already become the world's greatest producer of cutlery and edge tools. How did it happen? Internal economies of scale vastly outweighed deficiencies. Skills, innovations and discoveries, entrepreneurs, investment, key local resources (water power, coal, wood and iron), and a rapidly growing labour force swelled largely by immigrants from the region were paramount. Each of these, together with external credit, improved transport and ever-widening markets, played a significant part in the town's metamorphosis. Economic and population growth were accompanied by a series of urban developments which first pushed outward the existing boundaries. Considerable infill of gardens and orchards followed, with further peripheral expansion overspilling into adjacent townships. New industrial, commercial and civic building, most of it within the central area, reinforced this second phase. A period of retrenchment coincided with the French and Napoleonic wars, before a renewed surge of construction restored the impetus. -
South Yorkshire
INDUSTRIAL HISTORY of SOUTH RKSHI E Association for Industrial Archaeology CONTENTS 1 INTRODUCTION 6 STEEL 26 10 TEXTILE 2 FARMING, FOOD AND The cementation process 26 Wool 53 DRINK, WOODLANDS Crucible steel 27 Cotton 54 Land drainage 4 Wire 29 Linen weaving 54 Farm Engine houses 4 The 19thC steel revolution 31 Artificial fibres 55 Corn milling 5 Alloy steels 32 Clothing 55 Water Corn Mills 5 Forging and rolling 33 11 OTHER MANUFACTUR- Windmills 6 Magnets 34 ING INDUSTRIES Steam corn mills 6 Don Valley & Sheffield maps 35 Chemicals 56 Other foods 6 South Yorkshire map 36-7 Upholstery 57 Maltings 7 7 ENGINEERING AND Tanning 57 Breweries 7 VEHICLES 38 Paper 57 Snuff 8 Engineering 38 Printing 58 Woodlands and timber 8 Ships and boats 40 12 GAS, ELECTRICITY, 3 COAL 9 Railway vehicles 40 SEWERAGE Coal settlements 14 Road vehicles 41 Gas 59 4 OTHER MINERALS AND 8 CUTLERY AND Electricity 59 MINERAL PRODUCTS 15 SILVERWARE 42 Water 60 Lime 15 Cutlery 42 Sewerage 61 Ruddle 16 Hand forges 42 13 TRANSPORT Bricks 16 Water power 43 Roads 62 Fireclay 16 Workshops 44 Canals 64 Pottery 17 Silverware 45 Tramroads 65 Glass 17 Other products 48 Railways 66 5 IRON 19 Handles and scales 48 Town Trams 68 Iron mining 19 9 EDGE TOOLS Other road transport 68 Foundries 22 Agricultural tools 49 14 MUSEUMS 69 Wrought iron and water power 23 Other Edge Tools and Files 50 Index 70 Further reading 71 USING THIS BOOK South Yorkshire has a long history of industry including water power, iron, steel, engineering, coal, textiles, and glass. -
ARCHAEOLOGY DATASHEET 302 Steelmaking
ARCHAEOLOGY DATASHEET 302 Steelmaking Introduction A single forging produced ‘shear steel’, a second operation Although an important aspect of medieval and earlier resulted in ‘double shear steel’ and so-on. societies, the manufacture of steel was industrialised during Furnace design changed over time, and also appears to the post-medieval period. Many complementary techniques have shown some regional variation. The first English steel were developed which often operated at the same time on furnaces were built at Coalbrookdale (Shropshire) by Sir the same site; there were also close links with other Basil Brooke in c1615 and c1630. These were circular in ironworking processes. This datasheet describes pre-20th plan with a central flue. They probably contained a single century steelmaking processes in the UK, their material chest and would have had a conical chimney. Other 17th- remains and metallurgical potential. century cementation furnaces were located in and around Birmingham, Wolverhampton, Stourbridge and Bristol, but Carbon steel and other alloys none of these have been excavated. The north-east became Until the late 19th century, steel was, like other types of the main area of cementation steelmaking in the late 17th iron, simply an alloy of iron and carbon (HMS datasheet and early 18th centuries. Ambrose Crowley established 201). There was considerable variation in the nature of several cementation steelworks, and others followed. Of ‘steel’ and in the properties of individual artefacts. Cast these, the oldest standing structure is at Derwentcote iron, smelted in the blast furnace usually had a carbon (County Durham), built in 1734. Unlike the West Midlands content of 5-8%, making it tough but brittle. -
Sharpening Tips First of All, Make Sure That the Tools You Are Sharpening Are Equal to Your Efforts
GarrettWade White Paper Sharpening Woodworking Edge Tools This guide is designed to help you select the proper sharpening tools, and to instruct you in their care and use, so that you can look forward to years of satisfying, quality work. Even if you already own a number of sharpening tools, we hope you will find the sections on care and usage helpful, whether you are a professional or a home craftsman. A truly sharp tool is faster, more accurate, longer lasting, and certainly safer than a dull one, but a surprising number of skilled craftsmen fail to get their tools as sharp as they can (and should). In fact, the money and time you invest in getting your edge tools really sharp—and keeping them that way—will be repaid many times over in work quality and tool longevity. Once the very sharpest edge has been achieved, an occasional honing or stropping will maintain it. There are a huge variety of sharpening tools available – from power grinders (both vertical and horizontal, both slow and faster speeds), to diamond material, to solid carbide, to natural Arkansas, to water stones from Japan or the USA. Don’t be put off by this variety. Educate yourself, be thoughtful, ask for advice and you will develop a path that suits you personally. Volumes have been written in magazine articles and books on sharpening, and our brief write-up here can only scratch the surface. Nonetheless, we intend that this information to help get you started and give you a general frame of reference for subsequent information gathering or video watching. -
Helical's Machining Guidebook
Helical MACHINING GUIDEBOOK Quick Reference eBook for CNC Milling Practices & Techniques 1 | Machining Guidebook | © 2016 Helical Solutions, LLC Helical Contents Milling Techniques & Strategies Terminology & Common Calculations 01 | Milling Techniques . 3 04 | End Mill Construction . 37 Types of Tool Entry . 4 Geometry Definitions . 38 Ramping . 6 End Mill Construction . 40 Thin Wall Milling . 8 End Mill Anatomy . 42 Deep Pocket Milling . 10 05 | Common Calculations . 51 Finishing . 11 Decimal Conversion Chart . 52 Ball Nose Strategy . 13 Common Milling Calculations . 53 Corner Engagement . 17 Speeds & Feeds . 54 Angle Engagement . 19 Conventional vs Climb Milling . 20 06 | Tool Holding . 55 Chip Thinning . 22 Tool Holding . 56 Preventing Tool Pull Out . 58 02 | High Efficiency Milling . 23 High Efficiency Milling . 24 HEM Tooling . 25 Troubleshooting 03 | Depth of Cut . 26 07 | Troubleshooting . 60 Depth of Cut . 27 Troubleshooting Chart . 61 Depth of Cut - Peripheral . 28 Tool Wear . 65 Depth of Cut - Slotting . 34 Tool Deflection . 69 Copyright © 2016 by Helical Solutions, LLC . All rights reserved . This book or any portion thereof may not be reproduced or used in any manner whatsoever without the express written permission of Helical Solutions . 2 | Machining Guidebook | © 2016 Helical Solutions, LLC Helical 01 Milling Techniques Types of Tool Entry . 4 Ball Nose Strategy . 13 Ramping . 6 Corner Engagement . 17 Thin Wall Milling . 8 Angle Engagement . 19 Deep Pocket Milling . 10 Conventional vs Climb Milling . 20 Finishing . 11 Chip Thinning . 22 3 | Machining Guidebook | © 2016 Helical Solutions, LLC Helical Types of Tool Entry The type of part entry that is programmed has a lot of influence on the tool’s success and is one of the most punishing Theoperations type of part for entry a cutter programmed . -
HMSNEWS Gill Juleff and Matthew Baker
Instrumenting an experimental Sri Lankan wind-driven furnace HMSNEWS Gill Juleff and Matthew Baker Historical Metallurgy Society In 2007 the Society’s Coghlan Bequest generously supported Matthew Baker, an Engineering student from 68 Spring 2008 Exeter University, who joined a team from the Archaeology Department at Exeter University, under the direction of Gill Juleff, travelling to Sri Lanka to Annual General Meeting carry out a second series of iron smelting experiments. Cambridge, June 2008 The funds awarded to Matthew were used to purchase thermocouples and scientific equipment to help record This year our AGM will be held in Cambridge on conditions within these highly efficient and unusual Saturday 14th June at the Scott Polar Research Institute. furnaces. The following report summarises the As usual the AGM will be held first to which all Monsoon Steel project and Matthew’s role in it, and members of the Society are welcome to attend. presents some preliminary results. A more Following the AGM we will have our usual Spring comprehensive account of the new experiments will be meeting of presentations and visits. published on completion of the full analysis of the data. Presentations will include: • Steve Walton, Penn State University, on Scientific In the early 1990’s research carried out in Sri Lanka Instruments uncovered evidence of a large-scale iron producing industry of the first millennium AD at Samanalawewa, • Robert Smith on Frobisher’s Gold. in the southern foothills of the Central Highlands. Extensive survey and excavations revealed that iron was We will also have the opportunity to see some of the smelted in shallow, elongated furnaces which were wonderful museums in Cambridge – The Scott Polar located at the tops of steep hillsides and were driven by Museum, The Fitzwilliam, the Sedgewick and the powerful dry monsoonal winds – a furnace design and Archaeological Museum. -
14-Inch Woodworking Band Saw Models: JWBS-14OS, JWBS-14CS
Operating Instructions and Parts Manual 14-inch Woodworking Band Saw Models: JWBS-14OS, JWBS-14CS WMH TOOL GROUP 2420 Vantage Drive Elgin, Illinois 60123 Part No. M-708115 Ph.: 800-274-6848 Revision C 9/05 www.wmhtoolgroup.com Copyright © WMH Tool Group This manual has been prepared for the owner and operators of a JET JWBS-14 Band Saw. Its purpose, aside from machine operation, is to promote safety using accepted operating and maintenance procedures. To obtain maximum life and efficiency from your band saw and to aid in using it safely, please read this manual thoroughly and follow the instructions carefully. Warranty and Service WMH Tool Group warrants every product it sells. If one of our tools needs service or repair, one of our Authorized Service Centers located throughout the United States can provide quick service or information. In most cases, a WMH Tool Group Service Center can assist in authorizing repair work, obtaining parts, or perform routine or major maintenance repair on your JET product. For the name of an Authorized Service Center in your area, please call 1-800-274-6848, or visit our web site at www.wmhtoolgroup.com More Information Remember, WMH Tool Group is consistently adding new products to the line. For complete, up-to-date product information, check with your local WMH Tool Group distributor, or visit our web site at www.wmhtoolgroup.com WMH Tool Group Warranty WMH Tool Group makes every effort to assure that its products meet high quality and durability standards and warrants to the original retail consumer/purchaser of our products that each product be free from defects in materials and workmanship as follows: 1 YEAR LIMITED WARRANTY ON ALL PRODUCTS UNLESS SPECIFIED OTHERWISE.