Contents

 1   A Helpful Guideline to the Manual

 2   Registration
    2.1   How to Register
    2.2   Login for Registered Users
    2.3   Lost Your Password?

 3   General Functions
    3.1   Project Management
    3.2   Projects
    3.3   Files
    3.4   The Button ‘File’
    3.5   The Button ‘Extras’
    3.6   Button ‘Help’
    3.7   File Info
    3.8   Logging Out
    3.9   General eAssistant Functions
    3.10   Opening a Calculation from the eAssistant Server
    3.11   Opening a Calculation From Your Computer
    3.12   Saving a Calculation to the eAssistant Server
    3.13   Saving a Calculation to Your Computer
    3.14   The Button ‘Calculate’
    3.15   The Button ‘Redo’ and ‘Undo’
    3.16   Button ‘CAD’
    3.17   The Button ‘Report’
    3.18   The Button ‘Options’
    3.19   The button ‘Help’
    3.20   Message Window
    3.21   Quick Info: Tooltip
    3.22   How to Change the Unit System
    3.23   Automatic Dimensioning Functions (Calculator Symbol)
    3.24   User-Defined Input
    3.25   The Button ‘Question Mark’
    3.26   Calculation Results
    3.27   Template Files

 4   Shafts with Strength According to DIN 743
    4.1   Start the Calculation Module
    4.2   The Geometry Part
    4.3   General Functions
    4.4   2D and 3D View
    4.5   Toolbar
    4.6   Message Window
    4.7   Quick Info
    4.8   Calculation Part
    4.9   Documentation: Calculation Report
    4.10   How to Save the Calculation
    4.11   The Button ‘Redo’ and ‘Undo’
    4.12   The Button ‘CAD’
    4.13   The Button ‘Options’
    4.14   Calculation Examples: Shaft According to DIN 743

 5   Rolling Bearings According to DIN ISO 281
    5.1   Start the Calculation Module
    5.2   General Inputs
    5.3   Selection of Manufacturer and Bearing Type
    5.4   Specification of Bearing Load
    5.5   Nominal Rating Life
    5.6   Modified Rating Life Theory
    5.7   Bearing Selection
    5.8   Message Window
    5.9   Quick Info: Tooltip
    5.10   Calculation Results
    5.11   Diagrams
    5.12   Documentation: Calculation Report
    5.13   How to Save the Calculation
    5.14   The Button ‘Redo’ and ‘Undo’
    5.15   The Button ‘Options’
    5.16   Calculation Examples: Rolling Bearing According to DIN ISO 281

 6   Single External and Internal Cylindrical Gears According to DIN 3960 and Other Standards
    6.1   Start the Calculation Module
    6.2   Input of Geometry Data
    6.3   Input of Tool Data
    6.4   Input of Data for the Determination of Allowances
    6.5   Representation of Gear Tooth Form
    6.6   Input of Gear Tooth Profile and Gear Flank Modifications
    6.7   Some Notes for Internal Gears
    6.8   Input of Geometry Data for Internal Gears
    6.9   Manufacturing Process for Internal Gears
    6.10   Meshing Interferences for Internal Gears
    6.11   Message Window
    6.12   Quick Info: Tooltip
    6.13   Calculation Results
    6.14   Documentation: Calculation Report
    6.15   How to Save the Calculation
    6.16   The Button ‘Redo’ and ‘Undo’
    6.17   The Button ‘CAD’
    6.18   The Button ‘Options’

 7   Rack/Pinion Pairings According to DIN 3990, ISO 6336 and Other Standards
    7.1   Start the Calculation Module
    7.2   Input of Geometry Data
    7.3   Input of Tool Data
    7.4   Input of Data for the Determination of Allowances
    7.5   Representation of Gear Tooth Form
    7.6   Calculation of Gear Load Capacity
    7.7   Input of Gear Tooth Profile and Gear Flank Modifications
    7.8   Meshing Interferences for External Gears
    7.9   Message Window
    7.10   Quick Info: Tooltip
    7.11   Calculation Results
    7.12   Dokumentation: Protokoll
    7.13   How to Save the Calculation
    7.14   The Button ‘Redo’ and ‘Undo’
    7.15   The Button ‘CAD’
    7.16   The Button ‘Options’

 8   Cylindrical Gears According to DIN 3990 and Other Standards
    8.1   Start the Calculation Module
    8.2   Input of Geometry Data
    8.3   Input of Tool Data
    8.4   Input of Data for the Determination of Allowances
    8.5   Representation of Gear Tooth Form
    8.6   Calculation of Gear Load Capacity
    8.7   Input of Gear Tooth Profile and Gear Flank Modifications
    8.8   Meshing Interferences for External Gears
    8.9   Internal Gears
    8.10   Input of Geometry Data for Internal Gears
    8.11   Manufacturing Process for Internal Gears
    8.12   Meshing Interferences for Internal Gears
    8.13   Examples for Internal Gears in eAssistant Software
    8.14   Dimensioning for Gear Pairs
    8.15   Message Window
    8.16   Quick Info: Tooltip
    8.17   Calculation Results
    8.18   Documentation: Calculation Report
    8.19   How to Save the Calculation
    8.20   The Button ‘Redo’ and ‘Undo’
    8.21   The Button ‘CAD’
    8.22   The Button ‘Options’
    8.23   How to Calculate the Accurate Tooth Form of Involute Splines

 9   Planetary Gear Trains According to DIN 3990 and Other Standards
    9.1   Start the Calculation Module
    9.2   Configuration of a Simple Planetary Gear Train
    9.3   Basic Configuration of a Planetary Gear Train
    9.4   Input of Geometry Data
    9.5   Input of Tool Data
    9.6   Input of Data for the Determination of Allowances
    9.7   Representation of Gear Tooth Form
    9.8   Input of Power Data
    9.9   Calculation of Gear Load Capacity of Planetary Gear Trains
    9.10   Input of Gear Tooth Profile and Gear Flank Modifications
    9.11   Meshing Interferences for Planetary Gear Trains
    9.12   Additional Information On Planetary Gear Trains
    9.13   Dimensioning for Gear Pairs
    9.14   Message Window
    9.15   Quick Info: Tooltip
    9.16   Calculation Results
    9.17   Documentation: Calculation Report
    9.18   How to Save the Calculation
    9.19   The Button ‘Redo’ and ‘Undo’
    9.20   The Button ‘CAD’
    9.21   The Button ‘Options’

 10   Three- and Four-Gear Train Systems
    10.1   Start the Calculation Module
    10.2   Input of Geometry Data
    10.3   Input of Tool Data
    10.4   Input of Data for the Determination of Allowances
    10.5   Representation of Gear Tooth Form
    10.6   Calculation of Gear Load Capacity
    10.7   Input of Gear Tooth Profile and Gear Flank Modifications
    10.8   Meshing Interferences for External Gears
    10.9   Message Window
    10.10   Quick Info: Tooltip
    10.11   Calculation Results
    10.12   Documentation: Calculation Report
    10.13   How to Save the Calculation
    10.14   The Button ‘Redo’ and ‘Undo’
    10.15   The Button ‘CAD’
    10.16   The Button ‘Options’

 11   Straight and Helical Bevel Gears According to ISO 23509
    11.1   Start Calculation Module
    11.2   Basic Configuration of a Bevel Gear Pair
    11.3   Input of Tool Data
    11.4   Input of Geometry Data
    11.5   Input of Data for the Gear Body
    11.6   Input of Data for the Determination of Tolerances and Backlash
    11.7   Calculation of Load Capacity of Straight and Helical Bevel Gears
    11.8   Message Window
    11.9   Quick Info: Tooltip
    11.10   Calculation Results
    11.11   Documentation: Calculation Report
    11.12   How to Save the Calculation
    11.13   The Button ‘Redo’ and ‘Undo’
    11.14   The Button ‘CAD’
    11.15   The Button ‘Options’

 12   Spiral Bevel Gears According to Klingelnberg KN 3028 and ISO 23509
    12.1   Start Calculation Module
    12.2   Basic Configuration of Bevel Gear Pair
    12.3   Input of Tool Data
    12.4   Input of Geometry Data
    12.5   Input of Data for the Gear Body
    12.6   Input of Data for the Determination of Tolerances and Backlash
    12.7   Calculation of Load Capacity of Spiral Bevel Gears
    12.8   Message Window
    12.9   Quick Info: Tooltip
    12.10   Calculation Results
    12.11   Documentation: Calculation Report
    12.12   How to Save the Calculation
    12.13   The Button ‘Redo’ and ‘Undo’
    12.14   The Button ‘CAD’
    12.15   The Button ‘Options’

 13   Cylindrical Worms with Globoid Worm Wheel
    13.1   Start the Calculation Module
    13.2   Input of Geometry Data
    13.3   Input of Tool Data
    13.4   Input of Data for the Determination of Allowances
    13.5   Calculation of Load Capacity
    13.6   Message Window
    13.7   Quick Info: Tooltip
    13.8   Calculation Results
    13.9   Documentation: Calculation Report
    13.10   How to Save the Calculation
    13.11   The Button ‘Redo’ and ‘Undo’
    13.12   The Button ‘Options’

 14   Bolted Joints according to VDI 2230
    14.1   Start the Calculation Module
    14.2   Operating Data
    14.3   Assembly Properties
    14.4   Input of the Clamped Parts and Definition of the Basic Solid
    14.5   Selection and Input of the Connecting Elements
    14.6   Input of the Load Introduction and the Load Application
    14.7   The Display of the Joint Diagram
    14.8   Message Window
    14.9   Quick Info: Tooltip
    14.10   Calculation Results
    14.11   Documentation: Calculation Report
    14.12   How to Save the Calculation
    14.13   The Button ‘Redo’ and ‘Undo’
    14.14   The Button ‘Options’

 15   Interference Fits According to DIN 7190
    15.1   General Information
    15.2   Application
    15.3   Selection of Fit/Tolerances
    15.4   Automatic Dimensioning Functions (Calculator Button)
    15.5   Influence of Centrifugal Force
    15.6   Additional External Loads
    15.7   Operating Factor (Application Factor)
    15.8   Coefficients of Friction
    15.9   Stepped Hub Geometry
    15.10   Subsidence/Surface Smoothing
    15.11   Modification of Diameter
    15.12   Fretting Corrosion
    15.13   Assembly and Disassembly
    15.14   Example of Interference Fits
    15.15   How to Change the Unit System
    15.16   The Button ‘Redo’ and ‘Undo’
    15.17   Material Selection
    15.18   Message Window
    15.19   Quick Info: Tooltip
    15.20   Calculation Results
    15.21   Documentation: Calculation Report
    15.22   How to Save the Calculation
    15.23   The Button ‘Options’
    15.24   Calculation Example: Interference Fit According to DIN 7190

 16   Parallel Keys According to DIN 6892
    16.1   General
    16.2   Scope of DIN 6892
    16.3   Types of Parallel Keys
    16.4   Surface Pressure
    16.5   Permitted Surface Pressure
    16.6   Application Factor
    16.7   Load Factor
    16.8   Load Distribution Factor
    16.9   Friction Factor
    16.10   Load Direction Changing Factor
    16.11   Load Peak Frequency Factor
    16.12   Support Factor and Hardness Influence Factor
    16.13   Inputs for Calculation Method B
    16.14   Some Additional Information On Method C
    16.15   Design Recommendations of Parallel Keys According to DIN 6892
    16.16   Automatic Dimensioning Functions (Calculator Button)
    16.17   Material Selection
    16.18   Selection and Geometry of Parallel Keys
    16.19   Input of Individual Parallel Keys
    16.20   The Button ‘Redo’ and ‘Undo’
    16.21   Message Window
    16.22   Quick Info: Tooltip
    16.23   Calculation Results
    16.24   Documentation: Calculation Report
    16.25   How to Save the Calculation
    16.26   The Button ‘Options’
    16.27   Calculation Example: Parallel Key According to DIN 6892

 17   Involute Splines According to DIN 5480 and Other Standards
    17.1   Start the Calculation Module
    17.2   Field of Application of DIN 5480
    17.3   Input of Geometry Data
    17.4   Input of Tool Data
    17.5   Input of Data for the Determination of Allowances
    17.6   Representation of Gear Tooth Form
    17.7   Calculation of Strength
    17.8   Message Window
    17.9   Quick Info: Tooltip
    17.10   Calculation Results
    17.11   Documentation: Calculation Report
    17.12   How to Save the Calculation
    17.13   The Button ‘Redo’ and ‘Undo’
    17.14   The Button ‘CAD’
    17.15   The Button ‘Options’

 18   Serrated Shaft and Splined Shaft Connection According to Niemann
    18.1   Start the Calculation Module
    18.2   Profile Geometry Selection
    18.3   How to Change the Unit System
    18.4   Application Factor
    18.5   Load Peaks
    18.6   Kind of Load
    18.7   Stepped Hub
    18.8   Material Selection
    18.9   Message Window
    18.10   Quick Info: Tooltip
    18.11   Calculation Results
    18.12   Documentation: Calculation Report
    18.13   How to Save the Calculation
    18.14   Automatic Dimensioning Functions (Calculator Button)
    18.15   The Button ‘Redo’ and ‘Undo’
    18.16   The Button ‘CAD’
    18.17   The Button ‘Options’
    18.18   Calculation Example: Splined Shaft for Lifting Gear

 19   Bolts and Pins
    19.1   Start the Calculation Module
    19.2   Kind of Connection
    19.3   Pin Types
    19.4   Material Selection
    19.5   Application Factor
    19.6   Message Window
    19.7   Calculation Results
    19.8   Documentation: Calculation Report
    19.9   How to Save the Calculation
    19.10   The Button ‘Redo’ and ‘Undo’
    19.11   The Button ‘Options’

 20   Clamp Connections
    20.1   Start the Calculation Module
    20.2   Kind of Connection
    20.3   Application Factor
    20.4   Coefficients of Friction
    20.5   Required Clamping Force
    20.6   Material Selection
    20.7   Message Window
    20.8   Quick Info: Tooltip
    20.9   Calculation Results
    20.10   Documentation: Calculation Report
    20.11   How to Save the Calculation
    20.12   The Button ‘Redo’ and ‘Undo’
    20.13   The Button ‘Options’

 21   Hirth Coupling
    21.1   Start the Calculation Module
    21.2   Geometry
    21.3   Strength
    21.4   Message Window
    21.5   Quick Info: Tooltip
    21.6   Calculation Results
    21.7   Documentation: Calculation Report
    21.8   How to Save the Calculation
    21.9   The Button ‘Redo’ and ‘Undo’
    21.10   The Button ‘CAD’
    21.11   The Button ‘Options’

 22   Compression Springs According to DIN EN 13906-1-2002
    22.1   Start the Calculation Module
    22.2   General Information
    22.3   Input Possibilities
    22.4   Spring Geometry Selection
    22.5   Material Selection
    22.6   How to Change the Unit System
    22.7   The Button ‘Redo’ and ‘Undo’
    22.8   Message Window
    22.9   Quick Info: Tooltip
    22.10   Calculation Results
    22.11   Diagrams
    22.12   Documentation: Calculation Report
    22.13   How to Save the Calculation
    22.14   The Button ‘Options’
    22.15   Calculation Example: Compression Spring According to DIN EN 13906-1, Edition 2002

 23   Tension Springs According to DIN EN 13906-2-2002
    23.1   Start the Calculation Module
    23.2   General Information
    23.3   Input Possibilities
    23.4   Material Selection
    23.5   Spring end types
    23.6   How to Change the Unit System
    23.7   The Button ‘Redo’ and ‘Undo’
    23.8   Message Window
    23.9   Quick Info: Tooltip
    23.10   Calculation Results
    23.11   Diagrams
    23.12   Documentation: Calculation Report
    23.13   How to Save the Calculation
    23.14   The Button ‘Options’

 24   Timing Belt Drives
    24.1   Start the Calculation Module
    24.2   General Information
    24.3   Advantages and Disadvantages of Timing Belt Drives
    24.4   Pre-Selection of a Timing Belt Profile
    24.5   Configuration of Geometry of a Belt Drive
    24.6   Message Window
    24.7   Input of Power Data Of the Timing Belt Drive
    24.8   Documentation: Calculation Report
    24.9   How to Save the Calculation
    24.10   The Button ‘Redo’ and ‘Undo’
    24.11   The Button ‘Options’

 25   Tolerance Fit Calculator ISO 286, Edition 2010
    25.1   Selection of Fits
    25.2   Calculation of Possible Fits
    25.3   Example for Cylindrical Fits
    25.4   Further Possibilities

 26   Approximate Shaft Dimensioning According to Niemann 2001
    26.1   Material Selection
    26.2   Material Number
    26.3   Load Types
    26.4   Further Possibilities

 27   Rough Estimation of Bolted Joints According to VDI 2230 Sheet 1 (2003-02)
    27.1   Axial Load
    27.2   Transverse Load
    27.3   Strength Grade
    27.4   Load Introduction
    27.5   Tightening Technique
    27.6   Preload
    27.7   Further Possibilities

 28   Hardness Conversion According to DIN 50150: 2000-10
    28.1   Kind of Material
    28.2   Hardness Values
    28.3   Further Possibilities