Springs
Springs
(OP)
Hey guys, how do we define springs? in gauges? or just based on diameter? are there any guidelines in adopting springs in design? any standards available for springs in United states or In India??
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RE: Springs
RE: Springs
Century has a good catalog of springs. So does Lee.
some links:
http://www.centuryspring.com/
http://www.leespring.com/
http://smihq.org/
RE: Springs
In terms of specifying wire size, generally convention these days is give the actual dimension but practically you want to have this dimension match a standard gauge.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Springs
RE: Springs
RE: Springs
However, from experience I do have then because of the volumes involved there may not be a big price difference between custom springs and straight out of the catalog.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Springs
Springs are things that are intended to be flexible, and able to exert force on stuff. Not all springs are coil springs.
Is this an engineering question or one of those philosophy 101 questions, like "which way is up?"?
--
JHG
RE: Springs
Check out the Spring Manufacturing Institute.
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Springs
The only time that sort of information would be needed on a Drawing would be a) you're going to manufacture the spring yourself, or b) the Drawing was part of a request for a quote to purchase a custom-made spring. If you're simply calling out a standard spring as part of a product Drawing (i.e. Assembly), then just the vender catalog number with perhaps some basic 'size' info should be adequate.
John R. Baker, P.E.
Product 'Evangelist'
Product Engineering Software
Siemens PLM Software Inc.
Industry Sector
Cypress, CA
Siemens PLM:
UG/NX Museum:
To an Engineer, the glass is twice as big as it needs to be.
RE: Springs
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
RE: Springs
http://www.asbg.com/
nick
Nick
RE: Springs
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Springs
exactly my thoughts - there is a lot of system work which goes into the spring design, and its usually best for an engine (and probably car) OEM to fully define the required functional characteristics of the spring and let the supplier figure out the details of manufacturing it. You wouldn't normally be able to go select an appropriate valve spring for a new engine design from a catalog, and I assume the same goes for a suspension spring.
If you're shopping from a catalog, then yes a part number is probably adequate in the short term - but you don't have any control of whether that part number refers to different geometry/characteristics over the long term.
RE: Springs
RE: Springs
When I am picking a spring from a catalog, I have the performance constraints in mind and narrow the selection down from there. The physical parameters of a spring are going to narrow down your choices. Once I have one selected, I usually list the specs available such as OD, free Length, wire gauge, pre-tension (for extension springs), K (rate) and type of material (usually music wire or SSTL). I have to create a spec control drawing and this information is useful in case I have to find another source. Compression springs can also have other specs such as ground ends. For an extension spring, I may also have to define the style of end loops and their orientation relative to each other.
If I am working on a new design and nothing comes up in the catalog, I work with a spring manufacturer. I can narrow down the physical specs as I did above, but a spring company will have more expertise and experiance than I do and they usually have software to check fatigue life etc. Once we have arrived at a design, I will takes those specs and list them out like I do for a catalog part and create a spec control drawing.
Kyle
RE: Springs
Eventually I discovered that when I designed a spring conservatively, and used readily available materials, I always ended up with something very close to what was already available as a stock spring.
So I suggest that, if someone hasn't already painted you into a corner, i.e. with unusual environmental requirements or too little space available, it's best to design from a stock spring catalog. It's nice to know how to roll your own, but the spring manufacturers do a damn good job of covering the problem space with good-enough solutions.
Mike Halloran
Pembroke Pines, FL, USA
RE: Springs
Kyle