Advanced Spring Design (ASD7) is a spring design calculator jointly developed by Universal Technical Systems and the Spring Manufacturers Institute (SMI). This helpful resource merges engineering expertise with customized calculations to aid manufacturers in quality extension spring design.
Extension springs are just one type of spring this tool serves. The ASD7 calculator also aids in the manufacture of compression springs, spiral forms, torsion springs, garter springs, snap rings, washers, beams, and torsion bars.
Developed in a completely graphical environment, Advanced Spring Design features convenient and automatic unit conversion as well as convenient access to dynamic plots and reports. The ASD7 also includes an expandable extension springs material database, a profile system for saving and incorporating frequently used input data sets, as well as exportable DXF extension springs drawings.
The ASD7 calculator allows users to enter specifications to find extension spring rates and loads. Extension springs designs can also be backsolved for any variable.
This extension spring calculator provides SMI acceptable tolerances and calculates maximum safe loads. It also warns against potential design flaws such as settling or buckling.
W.B. Jones is expert at using this technology to design Custom Extension Springs. Let us design one to meet your exact specifications.
Specifying the right torsion spring for your application is the first step in achieving project success. Obtaining an accurate torsion spring measurement is essential. It is not difficult to obtain an accurate spring measurement if you use the correct tools and follow the right steps in taking the measurement.
The required tools include a micrometer, calipers, and a ruler or tape measure. Using these tools, obtain the following four measurements:
Find the wire diameter.
To achieve the highest degree of accuracy, use a micrometer to measure the wire diameter in two different locations on the torsion spring and take the average. This will assure precise readings and accurate ordering.
Find the outside diameter.
Typically referred to as “OD”, measurement of the outside diameter should be taken in the middle of the spring, since the end coils tend to run large.
Find the inside diameter.
Use your calipers to measure the inside diameter of the torsion spring. Since this is a more difficult measurement to accurately read, it is a good idea to double or triple check the measurements.
Measure the leg length of the spring.
Measure from the center to the end. Since the center of the spring is not marked, you’ll need to use your best judgment on this measurement. Again, double and triple checking is a good idea.
Determine the angle or relationship of the legs.
There are four major angles, all based from the center of the spring – 90°, 180°, 270°, and 360° relationship of legs.
Determine the direction of the wind.
Right hand springs follow a counterclockwise rotation. Left hand springs follow a clockwise rotation.
For more details and pictures regarding torsion spring measurement, read our guide to measuring torsion springs. Keep in mind, if you have an unusual spring of any type that is not easy to measure, you can speak to a member of our team for identification and ordering assistance.
W.B. Jones supplies die compression springs to meet a wide range of application needs. The rectangular shape of the material used for our die compression springs is designed to achieve the greatest possible load for a given amount of travel. Die compression springs are commonly used in die press applications, but can be used for any job involving a heavy load. All the ends are closed and ground.
To make springs easier to identify and evaluate, W.B. Jones die compression springs are color coded for easy identification from one strength to the next. Starting on page 28 of our catalog, we organize our die compression spring selection in an easy to follow chart.
The W.B. Jones die compression spring chart lists springs from lightest to heaviest load capabilities and categorizes them by color: Blue (35% of free length), Red (25% free length), Gold (20% of free length), Green (17% free length). They are organized by hole/rod size and then by the overall length, with the OD being be slightly smaller than the hole spec and the ID will be slightly larger than the rod diameter. The overall spring length will be slightly longer than what is listed for die compression springs, due to the need for set removal, or scragging.
Our 500 series dies compression springs are made from carbon steel, which is slightly less strong than the chrome silicon that is used for all of our other die compression springs. Another difference with the 500 series is that these springs are not colored.
Have an application that requires the strength of die compression springs? W.B. Jones has over 100 years’ experience providing quality die springs, both stock and custom to meet your needs.
Die springs are a variety of heavy duty compression springs designed for use in high stress, heavy load applications. They are fabricated from rectangular shaped material to reduce the solid height and increase efficiency.
Die springs are well-suited for assemblies requiring high force within limited installation dimensions. When specifying die springs, the factors to look at are working hole and shaft diameter. Since sufficient space is necessary for the die spring to function without hindrance, the critical measurement is the area within which the die spring works, or working hole, rather than the measurement of the actual die spring.
When working with die springs, keep in mind that the maximum travel should not be used or exceeded, otherwise the service life of the die spring will be considerably lessen. Die springs should always be installed pre-tensioned to avoid shock loads.
When specifying die springs, here are some important considerations:
- Consider how the die spring will be used. Will it be used for short runs, or will it need to withstand extreme stress and rapid cycles?
- Depending on the amount of space available, use as many die springs as possible with a minimal amount of deflection, and staying within the ideal operating range.
- Match the die spring with the proper hole and rod size to reduce the chance of buckling and spring failure.
- Be sure that preventive die maintenance includes replacement of die springs at recommended intervals, to reduce the likelihood of operational downtime.
- Replace all die springs at the same time to assure even load distribution.
- Never rework die springs by grinding the inside or outside diameter, or by cutting off coils – doing so could damage the die or cause premature spring failure.
Have an application that requires the strength of die springs? W.B. Jones has over 100 years’ experience providing quality die springs, both stock and custom to meet your needs.
Looking for a source for steel springs? An experienced and fully capable U.S. spring manufacturer, W.B. Jones can meet your steel springs requirements, from design and fabrication, to finishing processes and fast delivery.
Have a steel spring you are trying identify? Figuring out the right spring material and specifications doesn’t have to be complicated. Extensive experience enables our team to quickly determine the best spring option for your needs.
Only need a few steel springs? Or just need help finding a stock spring that will work for your application? W.B. Jones has over 5000 springs in stock – wire ranges from .007 to .500, typical OD’s .088″ to 5″, lengths from .125 to 10 ft. If you require custom steel springs, we can meet your needs and do not require a minimum quantity.
Need steel springs fast? Contact us – our team can help. We can ship stock springs out in 1-3 business days and as quick as 5 days for custom springs.
Types of steel springs we offer include:
Steel Spring Applications
Typical steel spring applications include power equipment, retractable safety devices, tape measures, timing devices, toys, fitness equipment, and gardening equipment. Steel springs are widely used in many industries including medical, automotive, oil and gas, telecommunications, textiles, agriculture, electronics, military, and aerospace.
Steel springs are made from tempered wire. The different wire diameters are created by a drawing processes. Wire starts as a 100 to 1000 pound bar about 2” in diameter and is continually drawn through smaller dies to reduce it to the required diameter. This processes enhances the tensile strength of the metal.
The most commonly used types of steel in spring fabrication are carbon steels and stainless steels. Traditionally, manufacturers will use music wire because of its high carbon content. This creates better quality and more uniform steel springs. One down side to music wire and other carbon steels is that they rust. If the springs will be exposed to wet environments, it may be best to use a stainless steel since it is corrosion resistant. It is important to note some types of stainless are slightly magnetic in spring tempered form.
Contact us to discuss your steel spring needs.
An astounding number of springs are put to work in the world around us every day. Depending on the industry and application in which they will be used, springs are manufactured in a broad range of sizes and configurations.
Given the diversity of spring applications, it might be surprising to learn that springs are most commonly made from only six basic types of materials. These include: music wire, hard drawn MB, oil tempered wire, stainless steel, phosphor bronze, and brass. Each of these material types offer specific and unique characteristics that are well-suited to individual uses and work environments.
To provide an overview in guiding spring material selection, we have developed a helpful and informative video explaining spring material options. We invite you to watch this video to learn more about spring materials, or call us to discuss your spring needs!
Understanding Wire Types Video
Torsion spring design is straightforward and simple with a software product called ASD7. This Advanced Spring Design ASD7 calculator determines torsion spring rates and loads based on user-input specifications. This tool is also capable of back-solving torsion spring designs for any specified variable.
Developed by Universal Technical Systems and the Spring Manufacturers Institute (SMI), the ASD7 spring design calculator brings together the benefits of engineering knowledge and precision calculations to facilitate the design of reliable, quality torsion springs. SMI acceptable tolerances and maximum safe loads for torsion springs are provided, as well as alerts to potential design flaws such as overstressing or limitations in working space.
Designed in an entirely graphical environment, ASD7 is user-friendly and offers automatic unit conversion, as well as convenient and quick access to dynamic plots and reports. Another feature is a torsion spring materials database, which can be added to by the user. A profile system for saving and incorporating frequently used torsion data sets and exportable DXF torsion springs drawings are additional perks that come with the software.
The ASD7 design calculator can be used for more than torsion springs. The software can also be used in the design of compression springs, spiral forms, extension springs, garter springs, snap rings, washers, beams, and torsion bars.
W.B. Jones is expert at using this technology to design Torsion Springs. Let us design one to meet your exact specifications.
The process of ordering the right compression springs for your application begins with understanding spring terminology. Knowing the basics will not only help you take accurate measurements of your spring, but it will also ease the communication of your spring needs to our sales team. Both of which will aid in getting you the right spring for your application and lessen the chances of spring failure.
Here are just a few common terms to get you started with your first lesson in compression spring terminology:
|Active Coils:||Those coils which are free to deflect under load. (i.e. the coils with space in between)|
|Buckling:||Bowing or lateral deflection of compression springs when compressed.|
|Close Wound:||Coiled with adjacent coils touching. (i.e. no space between the coils)|
|Deflection:||Movement of spring ends under the application of force.|
|Free Length:||The length of a compression spring in the unloaded position.|
|Load:||The force applied to a spring that causes a deflection.|
|Pitch:||The distance from center to center of the wire in adjacent active coils.|
|Rate:||Change in load per unit of deflection, generally given in pounds per inch.|
|Total coils:||Number of active coils plus the coils forming the ends.|
As an experienced spring specialist, W.B. Jones has compiled an extensive glossary of spring terms, providing you with a quick and handy reference for brushing up on the most widely used spring descriptors.
In all that we do, our goal is not only to provide the industry’s highest quality springs, but also to provide our customers with the best possible service. We are here to help you understand everything you need to know about the springs that will best meet your application needs. Contact us to discuss your project!
There are different options available when selecting spring end types. Your choice depends on the application in which the spring will be used. If the job requires it, a spring can have two different end types. In order to choose the right end type or types for your springs it is important to understand each end type and how they function.
The type of ends affect the pitch, solid height, number of active and total coils, free length, and seating characteristics of the spring. Selecting the right end type for your springs begins with getting to know the basic end types available.
There are two basic end types used for compression springs – closed and open. Each option offers the choice of either ground or not ground ends. The most widely used type is a closed or squared off end type. In the case of closed ended springs, the space between the last two coils is minimal so that the coils actually touch and it sits flat. Conversely, open ended springs are not squared off and tend to need some form of support, such as a rod. Open ends are usually only specified in special applications. Grinding the ends of compression springs helps springs sit more flat to reduce buckling. Grinding is a secondary operation, and therefore makes springs more expensive.
Hooks and loops are the two basic end type options used with extension springs. Loops are fully closed all the way around, and hooks have a gap. In most cases, stock extension springs are made with loop ends. If a hook is required, a gap can easily be cut in the loop to create the hook. Hooks and loops are available in a few different style options to match application needs. The most widely used end styles for extension springs are crossover, machine style, side style, and double loop ends.
In the case of torsion springs, the most common and versatile end type is a plain straight leg, with no bends. Customized designs are available for applications that require a torsion spring with bends. A sample, print, photo, or sketch is all that a good spring manufacturer will require to determine the torsion spring design that is needed.
The most common cause for extension spring failure is the flawed design that leads to an overstressed spring. Exerting too much stress, or force, than allowed by design can trigger the spring to break or take set. For example, an extension spring that is intended to be strong will have very little elasticity. If stretched out too far, it becomes highly stressed and susceptible to breakage. The damage can happen at the spring body or at the spring ends.
In dealing with extension springs, the ends are more fragile than the body. As the loops or hooks are formed, the wire is bent upward and the diameter of the ends is slightly reduced. The bend and smaller diameter creates a considerable concentration of stress. A properly engineered spring will take this concentration into account as it leads to premature failure.
If a spring is failing due to overstressing, it is likely the spring design needs to be changed. Here’s are common adjustments:
- Increase the outer diameter
- Decrease wire diameter
- Add more coils by making the body length longer
To avoid extension spring failure, it is important to provide accurate information about what is required. That ranges from the required extended length to the required load to the actual measurements of an existing spring. The more precise the details provided the less likely spring overstressing will occur. For more information about how to measure an extension spring or what information is needed, visit our custom extension springs page.
Other reasons for failure, apart from a flawed spring design, are unforeseen environmental implications and improper installation.
To be assured your extension springs are designed correctly for your application, please contact the spring design specialists at WB Jones.