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| كتاب Machine Designers Reference - Jennifer Marrs | |
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كاتب الموضوع | رسالة |
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Admin مدير المنتدى
عدد المساهمات : 18996 التقييم : 35494 تاريخ التسجيل : 01/07/2009 الدولة : مصر العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
| موضوع: كتاب Machine Designers Reference - Jennifer Marrs الأحد 13 مايو 2012, 2:15 am | |
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تذكير بمساهمة فاتح الموضوع : أخوانى فى الله
أحضرت لكم كتاب Machine Designers Reference Jennifer Marrs,P.E.
ويتناول الموضوعات الأتية :
BRIEF TABLE OF CONTENTS About the Authors . Acknowledgments . Introduction Chapter 1: Design and Analysis 1.1: Design of Machinery . 1.2: Engineering Units 1.3: Equations Chapter 2: Ergonomics and Machine Safety (Co-written with E. Smith Reed, P.E.) . 2.1: Ergonomics . 2.2: Machine Safety: Design Process 2.3: Machine Safeguarding 2.4: Other Safety Issues . 2.5: Recommended Resources . Chapter 3: Dimensions and Tolerances 3.1: Limits, Fits, and Tolerance Grades 3.2: Tolerances on Drawings, and GD&T 3.3: Tolerance Stack-Ups (Written by Charles Gillis, P.E.) . Chapter 4: Precision Locating Techniques (Written by Charles Gillis, P.E.) Chapter 5: Pins, Keys, and Retaining Rings Chapter 6: Pipe Threads, Threaded Fasteners, and Washers 6.1: Pipe and Port Threads . 6.2: Threaded Fasteners and Washers . Chapter 7: Welds and Weldments Chapter 8: Materials, Surfaces, and Treatments 8.1: Materials 8.2: Surface Finish 8.3: Heat Treatment . 8.4: Surface Treatment Chapter 9: Force Generators . 9.1: Springs . 9.2: Pneumatics 9.3: Electric Motors . Chapter 10: Bearings 10.1: Plain Bearings 10.2: Rolling Element Bearings . 10.3: Linear Bearings . Chapter 11: Power Transmission Devices . 11.1: Shafts . 11.2: Shaft Couplings . 11.3: Gears (Written by Gregory Aviza) 11.4: Gearboxes 11.5: Belts and Chains . 11.5.1: Belts . 11.5.2: Chains 11.6: Lead, Ball, and Roller Screws 1. Design and Analysis 1.1. Design of Machinery • Recommended Resources • Functional Design Specification • Research . • Synthesis and Conceptual Design . • Detail Design and Analysis • Factors of Safety . • Critical Considerations: Design of Machinery . • Best Practices: Design of Machinery .1 1.2. Engineering Units • Recommended Resources • Engineering Units • Unit Conversions 1.3. Equations . • Recommended Resources • Tables of Equations .1 2. Ergonomics and Machine Safety . 2.1. Ergonomics . • Recommended Resources • Body and Workspace Dimensions . • Body Dimensions • Workspace, Clearances, Enclosures, and Access Openings . • Operator Physical Capabilities and Limitations: Reaching / Grasping / Moving / Lifting . • Critical Considerations: Ergonomics 2.2. Machine Safety: Design Process • Recommended Resources • Risk Assessment . • Risk Reduction • Critical Considerations: Machine Safety: Design Process . 2.3. Machine Safeguarding . • Recommended Resources • Guards . • Protective Devices . • Procedural Safeguarding: Information, Instructions and Warnings . • Warnings Included in the Manual . 2.4. Other Safety Issues • Recommended Resources . • Emission of Airborne Substances or Modification of Surrounding Atmosphere • Emission of Radiation, Intense Light, Vibration, Heat • Emission of Noise • Hand / Arm Vibration . • Whole Body Vibration . • Machine Use in Explosive Atmospheres . • Moving the Machine • Machine Stability . • Lubrication • Danger Warning Alarm Signaling: Audible Signals and Visual Signals . • Lockout / Tagout Requirements • Emergency Stop Devices . • Critical Considerations: Other Safety Issues . 2.5. Recommended Resources . • Governmental Regulations, Statutes, Codes, and Publications • Books • Industry Safety Standards . • Internet Web Sites • Application of Literature to Design Topics . 3. Dimensions and Tolerances 3.1. Limits, Fits, and Tolerance Grades • Recommended Resources . • Types of Fits and Their Limits . • Machining Tolerances . • Limits of Size Data • Critical Considerations: Limits, Fits, and Tolerance Grades . • Best Practices: Limits, Fits, and Tolerance Grades 3.2. Tolerances on Drawings, and GD&T • Recommended Resources . • Implied Tolerances • Geometric Dimensioning and Tolerancing (GD&T) • Critical Considerations: Tolerances on Drawings, and GD&T . • Best Practices: Tolerances on Drawings, and GD&T 3.3. Tolerance Stack-Ups . • Recommended Resources . • Design Practice . • The Tolerance Stack-Up Chain • Practical Applications . • Summary . • Critical Considerations: Tolerance Stack-Ups . • Best Practices: Tolerance Stack-Ups 4. Precision Locating Techniques • Recommended Resources • Design Requirements . • The Two-Hole Problem . • Datum Reference Frame . • Design Process • Precision Locating Techniques . • Critical Considerations: Precision Locating Techniques . • Best Practices: Precision Locating Techniques 5. Pins, Keys, and Retaining Rings . • Recommended Resources • Pins and Keys in Shear • Pins . • Keys • Retaining Rings . • Critical Considerations: Pins, Keys, and Retaining Rings • Best Practices: Pins, Keys, and Retaining Rings . • Component Data . 6. Pipe Threads, Threaded Fasteners and Washers . 6.1. Pipe and Port Threads . • Recommended Resources • Standards • Critical Considerations: Pipe and Port Threads • Best Practices: Pipe and Port Threads . • Pipe and Port Thread Dimensions . 6.2. Threaded Fasteners and Washers . • Recommended Resources • Fastener Threads . • Tap Drills • Fastener Types, Materials, and Selection • Grades and Strength of Fasteners • Torque of Fasteners • Critical Considerations: Threaded Fasteners and Washers • Best Practices: Threaded Fasteners and Washers . 7. Welds and Weldments . • Recommended Resources • Weld Types . • Weld Symbols • Weldment Drawings • Materials and Treatments • Critical Considerations: Welds and Weldments • Best Practices: Welds and Weldments . 8. Materials, Surfaces, and Treatments 8.1. Materials • Recommended Resources • Metals Nomenclature . • Material Properties . • Common Material Choices . • Materials Data • Critical Considerations: Materials . • Best Practices: Materials 8.2. Surface Finish . • Recommended Resources • Surface Finish Symbols . • Surface Finish and Tolerance . • Surface Finish Data • Critical Considerations: Surface Finish • Best Practices: Surface Finish 8.3. Heat Treatment . • Recommended Resources • Hardness . • Heat Treatment Processes . • Heat Treatment and Distortion • Hardness from Heat Treating . • Critical Considerations: Heat Treatment • Best Practices: Heat Treatment . 8.4. Surface Treatment • Recommended Resources • Common Surface Treatment Types • Selection of Surface Treatments • Critical Considerations: Surface Treatment . • Best Practices: Surface Treatment 9. Force Generators . 9.1. Springs • Recommended Resources . • Spring Types . • Spring Materials • Helical Coil Spring Terminology . • Helical Coil Spring Fatigue . • Helical Coil Compression Springs • Helical Compression Spring Catalog Selection Steps . • Helical Compression Spring Design Steps . • Helical Coil Extension Springs • Helical Extension Spring Catalog Selection Steps . • Helical Extension Spring Design Steps • Helical Coil Torsion Springs • Helical Torsion Spring Catalog Selection Steps . • Helical Torsion Spring Design Steps • Belleville Spring Washers • Belleville Spring Washer Catalog Selection Steps . • Belleville Spring Washer Design Steps • Critical Considerations: Springs . • Best Practices: Springs 9.2. Pneumatics . • Recommended Resources . • Pressure and Regulation • Pneumatic Circuits • Pneumatic Symbols . • Air Actuators • Sizing Air Actuators . • Calculating Cv • Pneumatic Valves . • Sizing Valves • Critical Considerations: Pneumatics • Best Practices: Pneumatics . 9.3. Electric Motors • Recommended Resources . • Electrical Power • Motor Terminology . • AC Motors • DC Motors • Electric Motor Controls • Electric Motor Frames and Enclosures • Electric Motor Sizing • Critical Considerations: Electric Motors . 10. Bearings . 10.1. Plain Bearings . • Recommended Resources . • Lubrication of Plain Bearings . • Bearing Materials for Boundary Lubrication • Boundary Lubricated Sleeve Bearings . • Sleeve Bearing Selection Procedure for Boundary Lubrication . • Critical Considerations: Plain Bearings . • Best Practices: Plain Bearings . 10.2. Rolling Element Bearings • Recommended Resources . • Lubrication, Seals, and Shields • Bearing Characteristics . • Bearing Types • Radial Ball and Roller Bearing Dimensions and Tolerances . • Bearing Arrangements . • Loads on Bearings • Bearing Load Ratings and Life Expectancy • Bearing Selection Procedure for a Rotating Shaft Application • Critical Considerations: Rolling Element Bearings • Best Practices: Rolling Element Bearings . 10.3. Linear Bearings • Recommended Resources . • Lubrication • Plain Linear Bearings • Rolling Element Linear Bearings . • Critical Considerations: Linear Bearings • Best Practices: Linear Bearings . 11. Power Transmission Devices 11.1. Shafts • Recommended Resources . • Methods of Attachment • Materials and Treatments . • Deflection, Stress, and Fatigue . • Critical Speeds . • Shaft Design Procedure • Critical Considerations: Shafts • Best Practices: Shafts 11.2. Shaft Couplings • Recommended Resources . • Coupling Types • Flexible Coupling Types . • Coupling Selection • Critical Considerations: Shaft Couplings • Best Practices: Shaft Couplings . 11.3. Gears . • Recommended Resources . • Terms and Definitions . • Gear Types • Gear Trains • Shaft Attachment Methods • Gear Quality Ratings • Backlash • Materials and Treatments . • Lubrication and Wear • Spur Gears • Spur Gear Selection and Sizing • Helical Gears • Bevel Gears . • Worm Gears . • Critical Considerations: Gears • Best Practices: Gears 11.4. Gearboxes • Recommended Resources . • Gearbox Characteristics • Loads on Gearboxes . • Gearbox Selection • Critical Considerations: Gearboxes . • Best Practices: Gearboxes 11.5. Belts and Chains • Recommended Resources . • Drive Calculations 11.5.1 Belts . • Flat Belt Drive Design and Selection Procedure • V-Belt Drive Design and Selection Procedure • Synchronous Drive Design and Selection Procedure . • Critical Considerations: Belts • Best Practices: Belts 11.5.2 Chains • Chain Selection and Sizing . • Critical Considerations: Chains . • Best Practices: Chains 11.6. Lead, Ball, and Roller Screws Screw Characteristics • Screw Stresses, Deflection, and Buckling • Critical Speed • Linear Motion Screw Types . • Lead Screws . • Ball Screws • Lead or Ball Screw Selection Procedure . • Critical Considerations: Lead, Ball, and Roller Screws . • Best Practices: Lead, Ball, and Roller Screws 12. Machine Reliability and Performance . • Recommended Resources . • Machine Reliability . • Failure Modes, Effects, and Criticality Analysis . • Safety Category • Manufacturing Equipment Performance . • Condition Monitoring • Critical Considerations: Machine Reliability and Performance . • Best Practices: Machine Reliability and Performance
كلمة سر فك الضغط : books-world.net The Unzip Password : books-world.net أتمنى أن تستفيدوا منه وأن ينال إعجابكم رابط مباشر لتنزيل كتاب Machine Designers Reference - Jennifer Marrs رابط من موقع عالم الكتب لتنزيل كتاب Machine Designers Reference - Jennifer Marrs
عدل سابقا من قبل Admin في الجمعة 03 نوفمبر 2017, 6:46 pm عدل 2 مرات |
| | |
كاتب الموضوع | رسالة |
---|
Admin مدير المنتدى
عدد المساهمات : 18996 تاريخ التسجيل : 01/07/2009
| موضوع: كتاب Machine Designers Reference - Jennifer Marrs الأحد 13 مايو 2012, 2:15 am | |
|
أخوانى فى الله
أحضرت لكم كتاب Machine Designers Reference Jennifer Marrs,P.E.
ويتناول الموضوعات الأتية :
BRIEF TABLE OF CONTENTS About the Authors . Acknowledgments . Introduction Chapter 1: Design and Analysis 1.1: Design of Machinery . 1.2: Engineering Units 1.3: Equations Chapter 2: Ergonomics and Machine Safety (Co-written with E. Smith Reed, P.E.) . 2.1: Ergonomics . 2.2: Machine Safety: Design Process 2.3: Machine Safeguarding 2.4: Other Safety Issues . 2.5: Recommended Resources . Chapter 3: Dimensions and Tolerances 3.1: Limits, Fits, and Tolerance Grades 3.2: Tolerances on Drawings, and GD&T 3.3: Tolerance Stack-Ups (Written by Charles Gillis, P.E.) . Chapter 4: Precision Locating Techniques (Written by Charles Gillis, P.E.) Chapter 5: Pins, Keys, and Retaining Rings Chapter 6: Pipe Threads, Threaded Fasteners, and Washers 6.1: Pipe and Port Threads . 6.2: Threaded Fasteners and Washers . Chapter 7: Welds and Weldments Chapter 8: Materials, Surfaces, and Treatments 8.1: Materials 8.2: Surface Finish 8.3: Heat Treatment . 8.4: Surface Treatment Chapter 9: Force Generators . 9.1: Springs . 9.2: Pneumatics 9.3: Electric Motors . Chapter 10: Bearings 10.1: Plain Bearings 10.2: Rolling Element Bearings . 10.3: Linear Bearings . Chapter 11: Power Transmission Devices . 11.1: Shafts . 11.2: Shaft Couplings . 11.3: Gears (Written by Gregory Aviza) 11.4: Gearboxes 11.5: Belts and Chains . 11.5.1: Belts . 11.5.2: Chains 11.6: Lead, Ball, and Roller Screws 1. Design and Analysis 1.1. Design of Machinery • Recommended Resources • Functional Design Specification • Research . • Synthesis and Conceptual Design . • Detail Design and Analysis • Factors of Safety . • Critical Considerations: Design of Machinery . • Best Practices: Design of Machinery .1 1.2. Engineering Units • Recommended Resources • Engineering Units • Unit Conversions 1.3. Equations . • Recommended Resources • Tables of Equations .1 2. Ergonomics and Machine Safety . 2.1. Ergonomics . • Recommended Resources • Body and Workspace Dimensions . • Body Dimensions • Workspace, Clearances, Enclosures, and Access Openings . • Operator Physical Capabilities and Limitations: Reaching / Grasping / Moving / Lifting . • Critical Considerations: Ergonomics 2.2. Machine Safety: Design Process • Recommended Resources • Risk Assessment . • Risk Reduction • Critical Considerations: Machine Safety: Design Process . 2.3. Machine Safeguarding . • Recommended Resources • Guards . • Protective Devices . • Procedural Safeguarding: Information, Instructions and Warnings . • Warnings Included in the Manual . 2.4. Other Safety Issues • Recommended Resources . • Emission of Airborne Substances or Modification of Surrounding Atmosphere • Emission of Radiation, Intense Light, Vibration, Heat • Emission of Noise • Hand / Arm Vibration . • Whole Body Vibration . • Machine Use in Explosive Atmospheres . • Moving the Machine • Machine Stability . • Lubrication • Danger Warning Alarm Signaling: Audible Signals and Visual Signals . • Lockout / Tagout Requirements • Emergency Stop Devices . • Critical Considerations: Other Safety Issues . 2.5. Recommended Resources . • Governmental Regulations, Statutes, Codes, and Publications • Books • Industry Safety Standards . • Internet Web Sites • Application of Literature to Design Topics . 3. Dimensions and Tolerances 3.1. Limits, Fits, and Tolerance Grades • Recommended Resources . • Types of Fits and Their Limits . • Machining Tolerances . • Limits of Size Data • Critical Considerations: Limits, Fits, and Tolerance Grades . • Best Practices: Limits, Fits, and Tolerance Grades 3.2. Tolerances on Drawings, and GD&T • Recommended Resources . • Implied Tolerances • Geometric Dimensioning and Tolerancing (GD&T) • Critical Considerations: Tolerances on Drawings, and GD&T . • Best Practices: Tolerances on Drawings, and GD&T 3.3. Tolerance Stack-Ups . • Recommended Resources . • Design Practice . • The Tolerance Stack-Up Chain • Practical Applications . • Summary . • Critical Considerations: Tolerance Stack-Ups . • Best Practices: Tolerance Stack-Ups 4. Precision Locating Techniques • Recommended Resources • Design Requirements . • The Two-Hole Problem . • Datum Reference Frame . • Design Process • Precision Locating Techniques . • Critical Considerations: Precision Locating Techniques . • Best Practices: Precision Locating Techniques 5. Pins, Keys, and Retaining Rings . • Recommended Resources • Pins and Keys in Shear • Pins . • Keys • Retaining Rings . • Critical Considerations: Pins, Keys, and Retaining Rings • Best Practices: Pins, Keys, and Retaining Rings . • Component Data . 6. Pipe Threads, Threaded Fasteners and Washers . 6.1. Pipe and Port Threads . • Recommended Resources • Standards • Critical Considerations: Pipe and Port Threads • Best Practices: Pipe and Port Threads . • Pipe and Port Thread Dimensions . 6.2. Threaded Fasteners and Washers . • Recommended Resources • Fastener Threads . • Tap Drills • Fastener Types, Materials, and Selection • Grades and Strength of Fasteners • Torque of Fasteners • Critical Considerations: Threaded Fasteners and Washers • Best Practices: Threaded Fasteners and Washers . 7. Welds and Weldments . • Recommended Resources • Weld Types . • Weld Symbols • Weldment Drawings • Materials and Treatments • Critical Considerations: Welds and Weldments • Best Practices: Welds and Weldments . 8. Materials, Surfaces, and Treatments 8.1. Materials • Recommended Resources • Metals Nomenclature . • Material Properties . • Common Material Choices . • Materials Data • Critical Considerations: Materials . • Best Practices: Materials 8.2. Surface Finish . • Recommended Resources • Surface Finish Symbols . • Surface Finish and Tolerance . • Surface Finish Data • Critical Considerations: Surface Finish • Best Practices: Surface Finish 8.3. Heat Treatment . • Recommended Resources • Hardness . • Heat Treatment Processes . • Heat Treatment and Distortion • Hardness from Heat Treating . • Critical Considerations: Heat Treatment • Best Practices: Heat Treatment . 8.4. Surface Treatment • Recommended Resources • Common Surface Treatment Types • Selection of Surface Treatments • Critical Considerations: Surface Treatment . • Best Practices: Surface Treatment 9. Force Generators . 9.1. Springs • Recommended Resources . • Spring Types . • Spring Materials • Helical Coil Spring Terminology . • Helical Coil Spring Fatigue . • Helical Coil Compression Springs • Helical Compression Spring Catalog Selection Steps . • Helical Compression Spring Design Steps . • Helical Coil Extension Springs • Helical Extension Spring Catalog Selection Steps . • Helical Extension Spring Design Steps • Helical Coil Torsion Springs • Helical Torsion Spring Catalog Selection Steps . • Helical Torsion Spring Design Steps • Belleville Spring Washers • Belleville Spring Washer Catalog Selection Steps . • Belleville Spring Washer Design Steps • Critical Considerations: Springs . • Best Practices: Springs 9.2. Pneumatics . • Recommended Resources . • Pressure and Regulation • Pneumatic Circuits • Pneumatic Symbols . • Air Actuators • Sizing Air Actuators . • Calculating Cv • Pneumatic Valves . • Sizing Valves • Critical Considerations: Pneumatics • Best Practices: Pneumatics . 9.3. Electric Motors • Recommended Resources . • Electrical Power • Motor Terminology . • AC Motors • DC Motors • Electric Motor Controls • Electric Motor Frames and Enclosures • Electric Motor Sizing • Critical Considerations: Electric Motors . 10. Bearings . 10.1. Plain Bearings . • Recommended Resources . • Lubrication of Plain Bearings . • Bearing Materials for Boundary Lubrication • Boundary Lubricated Sleeve Bearings . • Sleeve Bearing Selection Procedure for Boundary Lubrication . • Critical Considerations: Plain Bearings . • Best Practices: Plain Bearings . 10.2. Rolling Element Bearings • Recommended Resources . • Lubrication, Seals, and Shields • Bearing Characteristics . • Bearing Types • Radial Ball and Roller Bearing Dimensions and Tolerances . • Bearing Arrangements . • Loads on Bearings • Bearing Load Ratings and Life Expectancy • Bearing Selection Procedure for a Rotating Shaft Application • Critical Considerations: Rolling Element Bearings • Best Practices: Rolling Element Bearings . 10.3. Linear Bearings • Recommended Resources . • Lubrication • Plain Linear Bearings • Rolling Element Linear Bearings . • Critical Considerations: Linear Bearings • Best Practices: Linear Bearings . 11. Power Transmission Devices 11.1. Shafts • Recommended Resources . • Methods of Attachment • Materials and Treatments . • Deflection, Stress, and Fatigue . • Critical Speeds . • Shaft Design Procedure • Critical Considerations: Shafts • Best Practices: Shafts 11.2. Shaft Couplings • Recommended Resources . • Coupling Types • Flexible Coupling Types . • Coupling Selection • Critical Considerations: Shaft Couplings • Best Practices: Shaft Couplings . 11.3. Gears . • Recommended Resources . • Terms and Definitions . • Gear Types • Gear Trains • Shaft Attachment Methods • Gear Quality Ratings • Backlash • Materials and Treatments . • Lubrication and Wear • Spur Gears • Spur Gear Selection and Sizing • Helical Gears • Bevel Gears . • Worm Gears . • Critical Considerations: Gears • Best Practices: Gears 11.4. Gearboxes • Recommended Resources . • Gearbox Characteristics • Loads on Gearboxes . • Gearbox Selection • Critical Considerations: Gearboxes . • Best Practices: Gearboxes 11.5. Belts and Chains • Recommended Resources . • Drive Calculations 11.5.1 Belts . • Flat Belt Drive Design and Selection Procedure • V-Belt Drive Design and Selection Procedure • Synchronous Drive Design and Selection Procedure . • Critical Considerations: Belts • Best Practices: Belts 11.5.2 Chains • Chain Selection and Sizing . • Critical Considerations: Chains . • Best Practices: Chains 11.6. Lead, Ball, and Roller Screws Screw Characteristics • Screw Stresses, Deflection, and Buckling • Critical Speed • Linear Motion Screw Types . • Lead Screws . • Ball Screws • Lead or Ball Screw Selection Procedure . • Critical Considerations: Lead, Ball, and Roller Screws . • Best Practices: Lead, Ball, and Roller Screws 12. Machine Reliability and Performance . • Recommended Resources . • Machine Reliability . • Failure Modes, Effects, and Criticality Analysis . • Safety Category • Manufacturing Equipment Performance . • Condition Monitoring • Critical Considerations: Machine Reliability and Performance . • Best Practices: Machine Reliability and Performance
كلمة سر فك الضغط : books-world.net The Unzip Password : books-world.net أتمنى أن تستفيدوا منه وأن ينال إعجابكم رابط مباشر لتنزيل كتاب Machine Designers Reference - Jennifer Marrs رابط من موقع عالم الكتب لتنزيل كتاب Machine Designers Reference - Jennifer Marrs
عدل سابقا من قبل Admin في الجمعة 03 نوفمبر 2017, 6:46 pm عدل 2 مرات |
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عدد المساهمات : 18996 تاريخ التسجيل : 01/07/2009
| موضوع: رد: كتاب Machine Designers Reference - Jennifer Marrs الأربعاء 07 نوفمبر 2012, 6:03 pm | |
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عدد المساهمات : 2041 تاريخ التسجيل : 21/01/2012
| موضوع: رد: كتاب Machine Designers Reference - Jennifer Marrs الخميس 08 نوفمبر 2012, 6:03 pm | |
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عدد المساهمات : 18996 تاريخ التسجيل : 01/07/2009
| موضوع: رد: كتاب Machine Designers Reference - Jennifer Marrs الخميس 08 نوفمبر 2012, 8:05 pm | |
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عدد المساهمات : 394 تاريخ التسجيل : 07/10/2012
| موضوع: رد: كتاب Machine Designers Reference - Jennifer Marrs الخميس 08 نوفمبر 2012, 8:11 pm | |
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عدد المساهمات : 18996 التقييم : 35494 تاريخ التسجيل : 01/07/2009 الدولة : مصر العمل : مدير منتدى هندسة الإنتاج والتصميم الميكانيكى
| موضوع: رد: كتاب Machine Designers Reference - Jennifer Marrs الخميس 08 نوفمبر 2012, 8:13 pm | |
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