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أخوانى فى الله أحضرت لكم كتاب Screw Thread Production to Close Limits Manufacturing Methods of Threading and Tapping and the Special Tools Developed for Accurate Quantity Production By Howard E. Adt
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Table of Contents Page Evolution of the Screw Thread Screw Thread Standards 7 What is Accuracy? Tables for Limits and Tolerances 13 How to Use the Tables 17 Gauging Devices 40 Definitions and Symbols 48 Testing Threads for Accuracy 50 Checking Thread Gauges 56 Method of Threading 63 Threading with Dies 65 Types of Die Heads 68 Screw Cutting on Automatics 79 Special Threading Requirements 83 Taper Threading Die Heads 88 Non opening Adjustable Die Heads 92 Adjustable Collapsing Taps 95 Combination Collapsing Pipe Taps and Reamers 99 Accurate Production of Brass Parts 101 Geometric Threading Machine 103 Cutting Speeds 105 Cooling Lubricants _ 108 Screw Thread Cutting Terms 111 Method of Forming Dies 115 Grinding the Dies or Chasers 117 Geometric Chaser Grinder 128 The Lessons of Experience Speed of Production 169 Appendix, Tables of Standards, Index, Etc. 173 in 735770INDEX A Page A. L. A. M. Standard Thread 7 A. S. M. E. Investigation Permissible Tolerances 11 20 A. S. M. E. Screw Standard 182 183 Accuracy, Testing Threads for 50 Accuracy, What Is ? 11 Accurate Production of >rass Parts 101 Accurately Maintained Lead on Long Screw 146 Acme Standard Thread 184 Acme Threads, Cutting Out of True 135 Acme and Square Threads Compared 9, 184 Adjustable Collapsing Taps 95 100, 176 Adjustable Die Heads, Non opening 92, 176 Adjustable Hollow Milling Tool 101, 178 Adjustable Stop for Style C Outside Lever Trip Die Head 87 Allowable Variations in Lead 38 Aluminum, Lubricant for 109 Angle of Chasers 137 Angle or Slope of Thread 5 Appendix 173 Arrangement of Stop for Operating Outside Trip Taper Threading Die Head 91 Automatics, Screw Cutting on 79 Automatics, Solid Dies on 66 B Basic Steel, Lubricants for 109 Bearing Ground Away, Milled Dies 120 Bearing or Lead Control of Tapped Die Ill Bessemer Steel, Lubricants for 109 Bolt Cutter Converted Into Threading Machine 136 Brass, Lubricants for 109 Brass Parts, Accurate Production of 101 Breaking of One Chaser 167 Briggs Standard Pipe Thread 8, 187 British Standard Pipe Thread 8, 188 Bronze, Phosphor, Lubricants for 109 Brown & Sharpe Automatic, Special Die Head for 80 Buttress Thread 10 C C Style Die Heads 83 87 Cast Iron, Lubricant for 109 Cause of Rough Threads 158 Causes of Stripping 160 Cause of Tapering Threads 168 Chamfer Ill Charts and Tables for Limits and Tolerances (A. S. M. E.) 14 38 Chaser Grinder, Geometric 128 Chasers, Interchangeable 153 Chasers, Methods of Grinding 117 127 Chattering, Cause of 153, 156 Checking Thread Gages 56 62 Chip Clearance 112 Class N. L. and Class P., Collapsing Taps 96, 98, 177 Cleaning Die Heads 74 Clearance .113 Clearance, Amount of 137 Clearance and Lead Control of Tapped Die Ill Cleveland Automatic with Style DD Die Head . .76 78 Collapsing Taps, Adjustable ." 95 100 Combination Collapsing Taps and Reamers 99 ' IVINDEX V Page Constants for Finding Diameter at Bottom of Thread 190 Cooling Compound 10 Cooling Lubricants 108 Cuts Necessary J55 Cutting Close to Shoulder 162 Cutting Edge of Milled Die 112 Cutting Speeds 105, 139 D D Style Die Heads 68 74 DD Style Die Heads 75 78 Decimal Equivalents of Millimeters 191 Definitions and Symbols 48 Diameters, Outside and Root for Taps and Screws 44 Die Head Opens at Wrong Time 141 Die Head with Roughing Attachment 71 Die Head Without Roughing Attachment 70 Die Heads for Automatics 75 Die Heads for Brown & Sharpe Automatics 80, 81 Die Heads for Cleveland Automatic 74 78 Die Heads for Fine Pitch, Large Diameter Work 86 Die Heads for Potter & Johnston Automatic 79, 80 Die Heads for Special Thread Cutting 83 87 Die Heads for Standard Threading Operations 68 82 Die Heads for Use on Live Spindle 93 Dies, Solid on Automatics 66 Dies, Threading with 68 Dies, Why Solid Dies Strip Threads 66 Different Thread Standards, Reason for 159 Drunken Threads 143 E Effect of Variation in Length of Fit 15 Elements Different Standard Threads 7 10 Elements of Screw Thread 4 End Play in Chasers , 143 Engine Lathe vs. Die Head 141 Essentials of Milled Form of Die 112 Evolution of Screw Thread 3 Examples of Acme Threads 9 Examples of Buttress Threads 10 Experience, Lessons of 135 169 F Faces on Which Dies Should Be Ground 117 Failure of Die Head to Open 143 Failure of Tap to Close 163 Failure to Hold Size 149 Failure to Maintain Lead 143 Failure to Track Properly 148 Fine Pitch, Large Diameter Work, Die Heads for 86 Floss on Threads 141 Form of Thread, Special 10 Formula for Medium Fit Screws, etc., for General Use 39 Franklin Institute Standard 164 French and International Standard Thread 9, 186 G Gaging Devices 40 43 Gaging Systems 12 Geometric Chaser Grinder. 128 Geometric Style C Die Heads 84 87 Geometric Style D Die Head 68 74 Geometric Style DD Die Head 75 79 Geometric Taper Threading Die Heads 88 91 Geometric Threading Machine 103, 104VI INDEX Page Gridley Automatic Special Die Head for 82, 93 Grinding Below Center 148 Grinding Dies or Chasers 117 128 Grinding for Different Materials 148 Grinding to Give Proper Clearance 122 Grinding with Hook and to Center 125 H Harris Lead and Angle Testing Machine 50 Hollow Milling Tool, Adjustable 101 Hook Grinding, Tapped and Milled Dies 125 How Far Down Dies May Be Ground 117, 151 How to Use Tables of Limits and Tolerances 17 I Illustrating Effect of Long Continued Correct Grinding, Milled Chasers.. 119 Improper Grinding, Results of 156 Inches Into Millimeters 192 Incorrectly Ground Tap Chasers 121 Inserted Blade Reamers and Collapsing Taps 100 Inside Trip Type Style C Die Head 83 Inside Trip Type Taper Threading Die Head 90 Inspection Limits for U.S.S. Taps and Screws . . .46, 47 Interchangeable Chasers 153 International Standard Thread , 9, 186 L Land of Die 112 Last Grinding of Tap Formed Chasers 151 Lead, Accurately Maintained on Long Screw 146 Lead, Allowable Variations 38 Lead Control of Die Ill Lead, Failure to Maintain 143 Lead, Accurately Maintained on Long Screw 146 Lead of Chasers, Restoring 162 Lead of Thread 5, 113, 147 Lead, Testing 51 Length of Service Obtainable from Properly Ground Chaser 124 Lessons of Experience 135 169 Limits and Tolerances 13 38, 44 47 Live Spindle, Die Heads for 93 Loewenherz, German Standard Thread 189 Longitudinal Clearance 1 12 Longitudinal Movement, Solid Die in Taper Threading 88 Lubricants, Cooling 108 110 M Machine, Geometric Threading 103, 104 Mechanism, Class N L Collapsing Taps 97 Mechanism of Geometric Style D Die Head 69 Method of Forming Dies 115 116 Method of Operating Collapsible Taps with Trip Lever 98 Method of Using Charts, Limits and Tolerances 16 Methods of Grinding 155 Methods of Threading 63 67 Metric Standards 10, 185 Metric Tables 191, 192 Micrometer Adjustment of Die Head 75 Milled and Tapped Dies Compared .113,115,118,155 Milled Dies, as Originally Ground 119 Milled Chasers with Bearing Ground Away 120 Milled Form Die 112 Milled Chasers, Incorrectly Ground 121 Milling Tool, Hollow Adjustable 101 Monel Metal, Lubricating Compound for 109 Multiple Thread 6INDEX VII N Page Negative Rake in Grinding Dies 113 Nomenclature, Screw Thread 4 Non opening adjustable Die Heads 92 Number of Cuts Necessary 155 Number of Threads per Inch 5, 6 O Oil Stones for Use on Dies or Chasers 167 Opening of Die Hea'd at Wrong Time 141 Operating Speed, Die Head 71 Original Grinding, Milled Chasers 119 Outside Diameter, Relation to Pitch Diameter 162 Outside Lever Trip Die Head, Style C 87 Outside Trip Type Taper Threading Die Head 89 P Phosphor Bronze, Lubricant for 109 Pipe Tapping vs. Threading 156 Pipe Taps and Reamers, Combination . 99 Pitch Diameter 19 Pitch Diameter, Relation to Outside Diameter 162 Pitch Diameters, Taps and Screws at Perfect Lead 45 Pitch of Multiple Thread 6 Pitch of Thread , 5 Potter and Johnston Automatics, Die Heads for 79 80 Prevention of Chattering 153, 156 Prevention of Waving Threads 165 Production of Brass Parts, Accurate 101 Production, Speed of 169 Pull off Trip Type Style C Die Head 85 R R. P. M. for Given Surface Speed 107 Radial Hook Grinding for Certain Materials 125 Rake in Grinding of Dies 113 Reamers and Collapsing Taps 99, 100 Relation of Pitch Diameter to Outside Diameter 162 Relation of Screw to Tapped Hole 18 Releasing Shank Type, Solid Adjustable Die Head 93 Requirements, Special Threading 83 Removing Dies from Die Head 72 73 Restoring Lead of Chasers 162 Rough Threads and Their Causes 158 Roughing Attachment for Die Head 71 S S. A. E. Screw Standard 180 181 Screw Cutting on Automatics 79 Screw Thread Cutting Terms Ill Screw Thread Standard Tables Appendix Screw Thread Standards 7 10 Screw Thread Tolerances 1 1 20, 159 Service Obtainable from Properly Ground Chaser 124 Self Opening Die Heads 67 Set of Milled Dies Correctly and Incorrectly Ground 121 Seventeen Year Old Die Head and Its Work 166 Staggered Threads 163 Shank and Cap of Shower Head of Which 45,000 Were Threaded with a Single Set of Chasers 169 Sharp Whitworth Threads 160 Shelby Steel Tubing, Cutting Pipe Threads on 144 Shoulder, Taper in Cutting Close to 168 Shoulder, To Cut Close to 162 Single Chasers, Replacing 159 Size, Failure to Hold . 149VIII INDEX Page Snubbing or Negative Rage in Grinding Dies 113 Solid Adjustable Die Heads, Non Opening 92 94, 176 Solid Taps, Variation in 164 Special Die Heads for Automatics 75 81 Special Threading Requirements 83 Special Threads 10 Specifications, Geometric Die Heads and Collapsing Taps 174 178 Speed of Operation, Die Heads 71 Speed of Production 169 Speeds, Cutting 105 Standard Dimensions Wrought Iron Pipe 187 Standard Threading Operations, Die Heads for 68 Steel, Lubricants for 109 Stock, Improper 74 Stoning Dies to Prevent Waving Threads 165 Straight Grinding, Tapped and Milled Dies 124 Stripping, Causes of 160 Style C Die Head for Potter & Johnston Automatic 80 Style C Die Heads 84 87 Style DD Die and One of Its Products 166 Style DD Die Head, Sequence of Operations on Cleveland Automatic. 76 78, 175 Style D Die Heads .68 74, 174 T Table of Diameters with Corresponding Pitches 179 Tables of Limits and Tolerances 20 38 Tables of Screw Thread Standards Appendix Tap Chasers as Originally Ground 120 Tap Chasers Incorrectly Ground 121 Taper in Cutting Close to Shoulder 168 Taper Threading Die Heads 88 91 Taper Threads Out of Round 163 Tapped and Milled Dies Compared 113, 115, 118 Tapping Open Hearth and Bessemer Steel 163 Testing Lead of Thread 51 Testing Threads for Accuracy 50' Testing Turret Lathes 74 Thread Gages 40 43 Thread Gages, Checking 56 62 Threading Brake Rods 136 Threading Machine Geometric 103, 104 Threading, Methods of 63 67 Threading Pump Bodies on W, & S. Hex Lathe 134 Threads, 15,000 in Six Years with One Set Chasers 138 Threads, Why Solid Dies Strip 66 Tilted Turret Lathe, Die Heads on 142 Tolerances, Permissible (A. S. M. E.) 11 20, 159 Tripping Mechanism, Style DD Die Head 77, 78 Types of Die Heads 68 U U. S. Standard Thread 7, 164 U. S. F. or United States Form Thread 165 U. S. S. Taps and Screws, Inspection Limits 46, 47 V V Thread Standard 7 Variation in Solid Taps 164 W Waving Threads and Their Prevention 165 What Constitutes a Special Thread 10 When One Chaser Breaks 167 Whitworth Standard Thread 8, 160 Why Solid Dies Strip Threads 6
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