Sets parameters for design of a torsion spring.
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Ribbon:
Design tab
Spring panel
Torsion
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Spring Reference Image
Click to display an image with the basic spring dimensions.
The image updates when you change the arm type, direction of spring load, or coil direction.
Model
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Angle Between Spring Arms |
This option is enabled only if you select the Custom option in the Model drop-down list. If you select other type of load, this value is calculated when you click Calculate. |
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Coil Direction |
Select the direction of the coil, left or right. |
Min. Load angle between arms is set based on the minimum deflection of working arm. 
Working Load angle between arms is set based on the maximum deflection of working arm. 
Max. Load angle between arms is calculated based on working force. 
Custom angle between arms is set by a user. Spring Wire
Enter or measure the wire diameter value.
Spring Diameter
Use the drop-down list to specify which spring dimensions are the inputs for the calculation, and which dimensions is calculated.
Outer - Mean and inner spring diameters are calculated for the specified wire diameter and outside spring diameter.
Median - Inner and outside spring diameters are calculated for the specified wire diameter and mean spring diameter.
Inner - Mean and outside spring diameters are calculated for the specified wire diameter and inside spring diameter.
Start Arm, End Arm
Use the drop-down menu to select the type of the spring arm. According to your selection, Bending Radius edit field is either enabled or disabled in the lower part of the area.
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Arm Type |
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Arm Length |
Enter or measure the arm length. |
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Bending Radius |
This option is disabled if you select Tangential Straight type of arm from the drop-down list in this area. |
Tangential Straight working and supporting spring arms are straight torsion arms. 
Radial External working spring arm is a straight torsion arm, and the supporting arm is a straight hook arm bent. 
Axial Straight working spring arm is a straight hook arm bent, and the supporting arm is a straight torsion arm. 
Radial Internal working spring arm is a straight torsion arm, and the supporting arm is a straight hook arm bent. Spring Length
Use this section to define which parameters are entered and which are calculated.
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Length Inputs |
L
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, t |
Calculates the number of spring coils for the specified wire diameter, length of unloaded spring and shape and size of spring hook. |
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t, n |
Calculates the length of unloaded spring for the specified wire diameter, number of coils and shape and size of spring hook. |
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Loose Spring Length |
Enter or measure the loose spring length value. This option is available only if L
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Close Pitch |
Specify the coil pitch. Clear the check box, and click |
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Active Coils Number |
Specify the spring number of active coils. |
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next to the edit field to open the Pitch between Spring Coils dialog box where you can specify the value of the pitch between spring coils. Selected value transfers to the Design tab when you click OK. When the edit field is enabled, the value is calculated when you click Calculate. Results
To display the Results area on the right side of the Calculation and Design tabs, double-click the double line on the right or click the chevron.
Results area displays appropriate results which need to be calculated to get all proper dimensions of spring. Click Calculate to display the values. The units of the results values can be changed. Double-click the specified value you want to change.
Following output parameters are displayed in the Results pane:
- Angle between Arms for the Free State (α 0 )
- Spring Index (c)
- Mean Spring Diameter (D)
- Outside Spring Diameter (D 1 )
- Inside Spring Diameter (D 2 )
Summary of Messages
Displays the reports about calculation. To open the Summary of Messages area at the bottom of the Calculation and Design tabs, double-click the double line at the bottom of tabs or click the chevron at the bottom of the tabs.