Just a heads up on the old GSDS5 software - there are many critical errors in this program - one for example is the E modulus for CrSi - for some reason it is just a little less than 30000000 ?? And the torsion spring program is baffling.
This error and many others have been corrected in the...
SMI's ASD 6.0 software performs fatigue calculations for valve quality wire, music wire and some SS. I'm assuming that the material is 302 SS. According to the ASD software the fatigue life for this spring is less than 100K cycles.
You can download a free three day trial of the software at...
In addition to the previous post: The load requirement is 0.3 Kg for all length - This is confusing as the loads on compression springs typically increases with the amount of deflection (unless the spring is cracked).
As the design sits the spring will go solid at about 5% of material minimum...
The amount of chrome was curiously left out of your material report. Ni Span 902 is the best fit but it has nominally 5.25% Cr.
Have a lab recheck the material for Cr.
Jack
Also, as some springs are scragged or "set" the diameter may increase - if the dimensions are critical to the application this increase must also have to be considered.
Jack
Does anyone have any experience on using torsion springs in the reverse direction. I know that it is not adviseable to do so, but are there any rules / formulas that apply to this type of operation?
Thanks, Jack
If a steel spring (1080) comes in contact with 2024 aluminum will galvanic corrosion initiate (clean environment)? Would a zinc plating help minimize the risk.
Thanks Jack
Is it possible to perform Chromate Passivation by using Trivalent Cr process without depositing any Hex Chrome?
If not, is the amount of Hex Cr typically acceptable for the limits imposed by the RoHS?
And what are people in this country doing about this issue?
Jack
I might recommend three books to consider:
"Handbook of Spring Design" put out by SMI
"Mechanical Springs" by A. M. Wahl
or the
"Spring Design Manual AE-11" by SAE
Most springs that operate at temperatures below 250°F are made from a high carbon steel with a good surface finish called...
I took and passed the metallurgy PE October 2003. Personally I thought that it was the hardest test that I ever took and I did not think that I passed. There was way too much transport theory stuff and thermodynamics which I have some sort of apptitude for (apparently). But I think that I passed...
All,
I am confused, is it necessary to bake stainless steel parts that have been pickled and passivated? No one seems to be doing it. I'm specifically talking about sheet or wire that has been transformed by cold working into martensite, like full hard (40% red.) 302 SS or 17-7PH in the CH900...
I am looking for information showing the advantages and disadvantages of heat setting compression springs for automotive application. Free length of 1.25" and Diameter of about 0.20" Chrome Silicon.
Jackpot
The corrosion rate on sulfuric acid peaks at 12N or 31.4%. Adding inhibitors to the acid will help, but the main consideration, metallurgically speaking is, the amount of carbon in the steel that you select with lower being better.
There are grades oof SS like 302L and 316L that have very low...
All of your comments and years of experience are appreciated, as they expose me to some of the more practicle means of determining free length tolerances.
Thanks, Jackpot
It is commonly known in the spring industry that when 302SS springs are stress releived after coiling, they increase in diameter (d) and decrease in free length (Lf); conversely, music wire decreases in diameter and increases in free length.
My question is why? I suspect that it has something to...
How would one go about calculating the free length tolerance on the following spring?
d = .016"
OD = .292"
Lf = 1.2"
Ntotal = 20
Material = Phos. Bronze
Standard equations I have seen come out with tol. bigger than the free length! Are there any equations that practically take into account...
I agree with The Tick, on the second and third points. If you want to leave your company leave. Giving your current company an "opportunity" to match the future company's offer is a dubious opportunity especially for the one who's leaving. For the following reasons: You will always be know as...
