From wire dimensions and standard spring sizes to tackling tight tolerances, Master Spring is here to answer all of your spring and wire form design questions. Browse our list of frequently asked questions below? Or, If you have specific questions about wire sizes, tolerances and applications we invite you to contact Master Spring or explore our Resource Center.
No. We manufacture all parts per your print, sample, or specifications. However, we can be a more economical source for standard or catalog springs when quantities reach production levels. We keep your blanket orders in stock and deliver per your just-in-time releases.
Cost is always a concern for product designers and purchasing agents.
Savings can be addressed in the following ways:
Yes. Our quality system is based on ISO 9001. We are certified in order to ensure that our springs and wire forms consistently meet customers’ requirements, and that quality is continuously improved. Our goal is to provide our OEM partners with predictable quality and supply. We are proud of our quality system. Learn more.
Yes, we work with engineers from established OEMs on rapid prototype orders. Our goal is develop long-term partnerships with OEMs where we support all of their spring and wire form needs, from prototypes to production quantities. We prefer not to work with solo inventors or design engineering firms that only order prototype quantities.
Our knowledgeable staff can help OEM engineers throughout the challenging phase of prototyping by offering advice and design review. Learn more about our rapid prototyping services. Contact us today for more information.
Yes. If a custom tool is required, we have the machinery, skill and experience to make it in-house to save cost and time. We normally purchase a full set of standard tooling that covers the wire diameter range for each machine that we own. Most orders do not require custom tools because of our large tooling inventory and the flexibility of our high-tech forming machines.
Yes. Master Spring has several means to prevent tangling in packaging and shipment. Some include bagging, paper layering, placing parts on a tack-a-board, and stringing parts. These methods can be discussed at the time of quotation. Learn more about this service!
Smart spring designs are dependent on many factors including dimensional and load requirements.
Consideration throughout the spring engineering process should be given to the following:
In most basic terms, tolerances should allow spring makers to fabricate quality parts by ordinary production means in the most economical way. Therefore the critical dimensions should be determined early in the engineering process to allow the spring maker to make adjustments or to compensate for the allowable variations in both both the wire size and mechanical properties of the materials.
Product designers often impose the “standard tolerance box for machined dimensions” to spring designs which prove impractical based on history and the nature of spring materials. Such boxes must be reviewed and more realistic tolerances applied.
Our spring design review team would be glad to help product designers determine what is critical and what specific tolerances should apply. Please call us at 708-453-2570 for spring engineering tips.
Burrs can be minimized during the wire forming process. However, sharp edges are a natural result of the cut-off operation. Sharp edges are generally harmless and removal of such can add more costs without adding any value to the spring performance. Give a second thought to adding the requirement to your drawing.
Stress relieving does change spring dimensions. Temperature and length of time in the oven, as well as material type, vary the spring dimension changes. We anticipate these changes so final product meets specifications. In general the following is true:
Stress relieving or heat treating affects the type of springs as follows:
If you change a wire diameter by 1%, your spring rate will change 4%. So an increase in wire size by 1% will result in a 4% stronger spring. The converse is also true. A decrease in wire size of 1% will result in a 4% weaker spring.
You will get a 3% change in torsion stress on the spring wire size.
If you increase the mean diameter by 1%, the change in spring rate will decrease by 3%.
Adding a coil weakens the rate. Removing a coil strengthens the rate.
e.g. If you have a compression spring that has ten active coils and a spring rate of 90 lbs./inch, and you want to get a rate of 100 lbs., how many active coils do you need?
Master Spring & Wire Form Co. offers several coating options to improve the look or durability of your products. These finishes do require additional lead times and may increase cost. However, finishes may prove cost effective down the road by improving life and performance of a spring.
Zinc plating
Passivation
Other
Manufacturing Springs for the Automotive Industry
Learn how Master Spring was able to manufacture a compression spring with exacting tolerances to support the thin walls of an automotive hose -- without the spring protruding the hose. The result: we are able to produce approximately 6,000,000 of these springs per year to spec.
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