Goodman Charts for Springs

Pretty tough to find any information. There was only "About 3,270,000 results (0.48 seconds)" results found when I searched.

Do your own homework.

To be fair Lyn, 3.27m hits is not any answer to his question. Did you wade through that pile of male bovine fecal matter to find the needed charts? Your education and all but the most minute part of your reference charts were handed to you from someone else doing their own homework. I'm not saying that you didn't do a bunch of work and spend huge amounts of time and $ to get it but you didn't have to reinvent the wheel. He was asking for help to save time and if you had found a manageable number of hits. I could see your point, but 3.27m? I see this a lot here and laugh most of the time and I agree with the sentiment but not this time. The search engines have all gotten less about info and more about amount and advertisement.

To this problem I give a bit of help:

Ixquick.com. A search engine that allow for Boolean searches, the only one I know.

Using the parameters: "spring" AND "materials" AND "strength" AND ("charts OR "graph")

I got 520,196 to as low as 3500+/- with the same parameters results.

Most of what I found led to something I had to buy in some way or were not helpful unless I wanted to do the calculations. Oddly when I misspelled material (meterial) I found this site, http://www.acewirespring.com/chem-phys-characteristics.html, which had a link to a pdf chart; a chart which I hope will help with the original question. I didn't find it when spelled "materials" correctly after looking through the first 12 pages. I still did not find any graphs so maybe he's on to something.

If I'm programming and need info nothing is more disruptive and distracting then having to go looking for it online. Now he had to read this mini rant to get it and that surely was punishment enough...

There is a link to the pdf chart on these pages:

http://www.spring-makers-resource.net/spring-steel.html

http://www.acewirespring.com/chem-phys-characteristics.html

More info but unexplored:http://www.spring-makers-resource.net/

Hope this helps

Dave

I'm happy for the OP that you are willing to perform the search for him.

You can perform this noble task at least 50 times a day, every day, here if you choose.

I'm sure that they will all be grateful to you. (Not)

I do not choose to do other's work for them.

Oh come on now lyn, they may be grateful but simply forget to say so, each and every @#$%^& one of them.

No I don't want to do that either. I get off an tangents all by myself and getting vector input from another source is not productive for me. My ADD gets me lost on the web and my dyslexia makes it hard to tell if I'm coming or going. That's how I ended up doing a search for "meterials". I just read the OP as a "if you know tell me or I'll find it myself" kinda thing. I assumed if was inputting a spreadsheet that complex he could do a web search. I didn't know what a Goodman chart was, now I do.

If he had asked where to find odd, old, info on metal work, or how to build your own lathe I don't need to search I would have sent him to lindsaybks.com. I know that off the top of my head. Plus I had to poke you a bit as I have not been here in a while. I like reading and following all the tangent thoughts and links. Takes hours sometimes, but I find the most interesting things here.

SAE design manual

Excel is capable of doing the chart for you or better said you can make the chart in Excel. Now that you have it calculated should be simply a matter of visualisation.

If Google is not your friend - Bing it!

Obviously Lyn did not understand my question. Possibly because my English is not good enough (I am from Spain), but it is not necessary to be unpleasant. It is easier and time saver not to answer. I have done always my homework.
It is very easy to find an approximated Goodman chart (DIN Specs have some and SAE too) but this is not my intention.
What I have seen up to today is that Goodman diagrams depends on 3 variables; diameter of the wire, type of material, and cycles before the break of the sample. In the next picture it is an example of the graphic from my EXCEL file.

What I am looking for is a deep study that gives me the data to fill the Goodman diagram, as I said, for different materials and wire diameters.

David, Thanks for your help. I will analyze the info that you gave me.

I was going to make a bad joke ask you if you speak Mexican in Spain but that would be like asking someone from the UK if he spoke american.

I have been digging around and you can find the formulas but no diagrams to compare your output with. The spring-makers resource web page seems to be full of info related to what you are doing. Springs are the most complex one piece thing I know and finding the one for a particular application is a huge task with many variables. Making them is magic as far as I'm concerned. If you can make a graph that will show the expected performance over time then, señor: usted es un asistente.( hope I got that correct.)

When I find something like that I bookmark, screen save, image save, Web page save, and download all the info I can. If I find more I will post it for you. I would like to see more details when you have it the way finished.

David

Pose the above as question and you would receive a different answer from Lyn and anyone else here. Sometimes questions come out of minds that are full of what they are doing, that when it comes to ask quesitions to the unknowing public they have to be worded a lot more careful and have a lot more information in it than even your question had. We dont know you and you ask a question with a background we do not have.

All you said was you want to know where to get the information from! So if I take your intitial question the answer is "Google or Bing It". Lyn is maybe unpleasant but I would rather say he is direct!

Now you adding the necessary information in there which hopefully is still enough for someone to step in and answer it. I dont have that answer as I am not working with springs but as David says there is probably a lot more to Springs than you can grasp with an Excel sheet. What comes to mind is that its not only the material and wire that makes a difference but also the form.

Maybe start contacting spring manufactures as they can maybe better help you.

Sorry to say that: but google is your friend again here!

One more thing, by looking at your digram I think that the Final value is all the same for any in between point. The gap is already filled in in a way isnt it?. . .

I will try to answer both David and Smith,
The company where I work is developing hinges and latches for the automobile industry. We work always together with he suppliers but there is an invisible border from where the supplier cannot help us because they don't know our product and and sometimes we need too many iterations to find the solution. I don't want to replace professional software I only want to find a dynamic solution to work with.
In fact, I use EXCEL only as an interface. The real routines are visual basic developed as a Macros. It is a fast way to solve problems like this. When I develop programs, the part that gives me much more time is the interface.
You can find the EXCEL file in to the next web page (http://www.eacim.es/Descargas.htm) It is still under development. I am sorry, is in Spanish.
My calculations are quite accurate comparing with the one that I receive from my suppliers(only 4% difference but for sure I will find the reason)
Smith, In case you don't know how to interpret a Goodman diagram
In the next example, the green line is the tensile strength min and max from my spring. The other color lines represent the border from where the spring will not reach the number of cycles.
For example, in the next diagram the spring will achieve 10^6 cycles bot not 10^7.

In the next one the spring would not reach even 3*10^4 cycles.

.