If the springs are plated with silver, don’t they tarnish quite quickly?
Tarnish? I was wondering how they’ll look after the lithium fire. How does one extinguish a lithium fire, boron or graphite- halon?
Please measure the contact pad in your driver. What is the maximum diameter spring it can take without jeapordizing contact with legs on chips under compression for the larger diameter body. Think about how many amps you wish to flow through this spring. Now think about how big a vent incident or explosion you are willing to deal with. It’s not ALL fun and games.
I’m in for 20-40 springs, depending on others’ interest. If there ain’t enough demand, than I’ll get 40.
Mattaus, can I presume you’re selling these springs along side your FET switches?
I had figured on putting the spring upside down, so I checked how big of a diameter I had on the negative pole of my batteries, poop! About .38 inches on average and the contact pad is only .36 inches in diameter. So then I figured that the AA size stock beryllium spring would work and Ta-Da WRONG! The base is .39 inches for the stock beryllium spring. So much for my creative input.
Depending on price, id be in for min 20.
A spring that tapers from 4mm to 8mm seems ideal. That way it could be mounted inverted if the driver pad is on the smaller side and it still wouldn't splay larger than a positive battery pole.
I'd take 25 of each, driver side and tailcap switch side (if we end up doing those). Even more if the tailcap switch side compresses flat.
20 should do for me.
Don’t know how many… depends on the details.
Depending upon the alloy, BeCu has an electrical conductivity of 7-50% that of pure copper…
And Silver plated BeCu? That would only make it higher. And of course, we can’t use pure copper for a spring, so how does it compare to music wire?
Silver plating won’t make a rat’s ass difference… too little material to affect things.
Depends upon the alloy… could be as low as 2%…
Seems to me you’re wrong TP.
Moi? Wrong? Never! :party: The only way silver plating will have any significant effect on electrical conductivity will be at microwave frequencies where the electrons are carried at the surface of the material (aka skin effect). For DC/audio freqs, the bulk material is where the conductivity occurs.
Well, then I have to wonder why a major spring manufacturing company would say “But one material, beryllium copper, has the distinction of being one of the best for battery contacts.” And go on and on about it’s robust ability to take compression and maintain shape far more than other materials while offering greater strength and thinner profiles. It would stand to reason that if the company makes springs, nothing but springs, they would have a pretty good grasp on the best materials to make them from.
Wikipedia even says that BeCu has better thermal and conductive properties than aluminum, performing only slightly less than pure copper itself.
At any rate, they’re far better than gold plated steel springs. Can one deduct that a thin gold plating carries as little conductive properties as the aforementioned rat’s derriere? After all, there’s so little there…
Just wondering, what is “too little material to affect things”? One mouse turd in a gallon of tea is very little, but I suppose you wouldn’t drink the tea?
I’m in for 20…I’ll specify sizes later. Thanks for organizing this…much appreciated!
I will be interested to see if you get samples for testing. From the copper alloy springs I have tried over the years, they tend to be much stiffer than spring steel and they tend to develop a "compressed memory" rather rapidly, but maybe these are made a different way than the ones I have tried out.
If they do get tested first and prove out to be as good as spring steel ones, then I would want to purchase "an amount somewhere under 100pcs, depending on the price", of springs that are in the range of 10mm-12mm bottom diameter, 5mm-7mm top diameter, 10mm-12mm tall and .8mm-.9mm wire thickness.
I would take 20 if we get enough together for the cheap price.
I also would like to take 20.
I would be in for 20 springs.