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Please login with your user name and your password. Select the module ‘Tension spring’ through the tree structure of the Project Manager by double-clicking on the module or clicking on the button ‘New calculation’.
The calculation module is opened in a new window.
For the calculation of the tension spring according to DIN EN 13906-2 forces or deflections or a combination of both can be specified for the calculation.
The values depending on parameters entered previously are calculated automatically.
For the entry of forces and deflections there are the following possibilities:
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The input fields that depend on each other are color-coded to guide you. When you click into an input field, this input field turns violet. The corresponding input field will turn yellow. It makes it easy for you to see how these values relate to each other and how they change.
Use this function to change the unit of measurement.
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Enter either a value for the wire diameter 
or the spring rate 
. Both values are calculated.
When you click on the input field, the corresponding input field turns yellow. It makes it easy for you to see how
these values relate to each other and how they change.
Please note: To consider the tolerances for the wire diameter, click on the ‘Options’ button. Select DIN 2076 B/C or DIN 2077. In addition, the calculation report contains all information on the tolerances according to DIN 2097 (see section 12.11 ‘The button Options’).
You can enter the values for the tension spring geometry, such as length, diameter and coils. According to the specified input value, the values are calculated automatically.
For cold-formed springs an initial tension is created that elastic coils lie on top of each other without any load.
Hot-formed springs have no initial tension and are manufactured with a clearance between the coils. Add the
number of coils 
to the appropriate input field.
Please note: Click on the ‘Material’ button to open the material database. Here you can select different
materials. Futhermore, you get information on the manufacturing process (see also section 12.3 ‘The material
selection’).
Before you start the calculation, it should be clarified whether the load refers to a dynamic or static/quasi static load. The calculation is possible for both dynamic and static/quasi static load.
Please note: Quasi static load means: Number of load changes 
Click on the ‘Material’ button and select the material from the database. In case you cannot find the required material in the database, you can define your own material.
The material database is opened.
Please select the material from the list. Further, you will get detailed information on the material.
Please note: Move fast within the listbox and select the material by using the arrow keys ‘Up’ and ‘Down’ on
your computer keyboard. This allows you to browse through the list to view details or to compare different
materials.
To define your own material for the spring, please select the entry ‘User-defined’.
Specify the individual material and add a comment. Confirm your inputs with the ‘OK’ button.
Please note: Please note that by changing the material, your individual definition of a material is
deleted.
Depending on the manufacturing process of the chosen material (e.g. hot-formed rolled or cold-formed), the calculation of the tolerances is determined according to DIN 2095 or DIN 2096. In addition, the eigenfrequency of the spring is calculated.
Please note: Because there is no DIN standard that provides geometry data for the tension spring, the ‘Spring
geometry database’ button is disabled. In case you need geometry data, please contact the spring
manufacturer.
Various forms of loops and connection elements are used for the spring power transmission. Select the spring end types from the list:
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Please note: You can combine any loop form or connection element for the spring ends. In order
to select equal spring ends very fast, simply activate the option ‘Equal spring ends’. When this
option is enabled, equal spring ends are displayed automatically in the list. Is this option disabled,
you can combine again different end types. Additionally, you get a representation for each end
type.
and unsprung coilsThe distance 
from the inner edge of the loop to the spring body is displayed as well as the unsprung
coils.
The calculation module enables you to define your own distance and to calculate special tension springs. You can enable the input field by clicking the small checkbox next to it. After clicking the checkbox, you have to enter the input value.
The calculation module contains a message window. You get all information, warnings and hints. For example whether the tension spring is suitable for the case of application. The information will also appear in the calculation report later. After the completion of your calculation, click on the ‘Report’ button to create a calculation report (see section 12.8 ‘The documentation: The calculation report’).
All important calculation results, such as the static and dynamic utilization of the permissable stress, the spring
deviation 
and the utilization of the permissable spring deflection 
, are determined and displayed
immediately during the input of values. Which means that after every input of data, the results are calculated
again. Click on the button ‘Calculate’, your input data will be confirmed, the results will be calculated and be
displayed in the result panel. If you press the ‘ENTER’ or the ‘TAB’ key of your keyboard or click in a different
input field, your data will be also confirmed automatically. If the result exceeds certain values, the result will be
marked red.
You get a graphical representation of the load-deflection diagram and Goodman diagram. Click on the diagram and a larger image is opened in a new window.
Please note: The Goodman diagram is displayed only for the dynamic load.
After the completion of your calculation, you can create a calculation report. Click on the ‘Report’ button.
The report is opened.
The calculation report contains a table of contents. You can navigate through the report via the table of contents that provides links to the input values, results and figures. The report is available in HTML and PDF format. Calculation reports, saved in HTML format, can be opened in a web browser or in Word for Windows.
‘Save as’ from your browser menu
bar. Select the file type ‘Webpage complete’, then just click on the button ‘Save’.
When the calculation is finished, you can save it either on the eAssistant server or on your own workstation. Click on the ‘Save’ button.
If you have activated the option ‘Enable file save local’ in the Project Manager and the option ‘Local’ in the
calculation module, a standard Windows dialog for saving the file on your workstation appears.
Please note: You must not forget that the calculation module has to be closed to activate the option ‘Enable file save local.’
In case you have not activated this option, a new window is opened and you can save the calculation on the eAssistant server.
Please enter a name into the input field ‘Filename’ and click on the button ‘Save’. Then click on the button ‘Refresh’ in the Project Manager. Your saved calculation file is displayed in the window ‘File’.
The button ‘Undo’ allows you to reset your input to an older state. The button ‘Redo’ reverses the undo.
The button ‘Options’ allows you to change some general settings.
A new window is opened.
Here you can change the general settings. Modify the tolerances for the wire diameter according to DIN 2076 B/C and DIN 2077 as well consider the operating temperature. Please change here also the number of decimal places which will appear later in the calculation report.
and unsprung coils
