Well it isn’t gold! (mine is in leaf form - not convenient at conducting).
Have a few odds and ends in the shop. Had some platinum once - used it as a heater.
As for the copper coils, they do get compressed. What did you imply by “lower and lower” ?
Besides, my rudimentary set-up for tailcap measurement gave 17 amps with the stock XPL-2 and Q30s in the lamp. I may try out your springs to see the gain.
My idea is the copper is the primary conductor, the nickel steel spring to sustain the mechanical load.
Visually, the tailcap looks very much as I had made some year ago.
I could take it apart and compare to my original posting, but I rather wait til I have your gen 3 springs as I may try them.
The trick may lay in the soldered cap, this retains the copper coil. These coils were just wound around some mandrel, I believe some 5 turns and had the ends loop flat. The caps were presoldered and the nickel steel spring was fluxed with an acid (something laying in my soldering pastes drawer). The base is completely puddled in solder. A very good mechanical connection.
Some have posted 20 and some amps on a Q8 (to be taken with a grain of salt). But with my phone’s lux meter and a conversion factor that I derived from a known flashlight, I got some 5700 lumens (on turn on). I’m happy with the results.
Copper doesn’t need to hold the strength on its own, when they are joined together at the top and at the bottom steel should push it up.
And no, double BeCu won’t be nearly as conductive as that.
1 mm copper wire (AWG18) has 50% better conductivity than 0.8 + 1 mm BeCu (w/out extra coating). Furthermore removing coils should reduce the conductor length. And…without tight coils I think that conductor could be thicker.
Spring upper diameter: 6,25mm
Spring base diameter: 9mm
Spring thickness: 1,0mm
Spring height: 12mm Total number of coils: 5 Plating: Copper(25um) + Silver electroplating
Small spring:
Spring upper diameter: 4,25mm
Spring base diameter: 5,70mm
Spring thickness: 0,8mm Spring height: 10,5mm
Total number of coils: 5 Plating: Copper(20um)+ Silver electroplating
We are at:
621 large BeCu springs
557 small BeCu springs
So, we’ve got some confirmation for the final specs.
Large spring:
Material: Beryllium Copper C17530 38% IACS Spring upper diameter: 6,50mm
Spring base diameter: 9mm
Spring thickness: 1,0mm
Spring height: 12mm Total number of coils: 5 Plating: Copper(25um) + Silver electroplating
Small spring:
Material: Beryllium Copper C17530 38% IACS
Spring upper diameter: 4,35mm
Spring base diameter: 5,80mm
Spring thickness: 0,8mm Spring height: 10,5mm
Total number of coils: 5 Plating: Copper(20um)+ Silver electroplating
Will probably be ordering the springs soon.
Just post your interest here, and I’ll get you on the list as quickly as possible.
If needed, PM for large quantities of spring orders so we can discuss more about it.
Have you received the funds I sent you? I’ve never bought from you before and want to be sure you got it, payment message was my username, check the pm.
1. No, not optimally. You want 1x large, and 2x small.
2. Same thing.
3. Only 1x large and 1x small on the tail. No need for a driver spring change since it’s already a BeCu spring.
I did do this mod too. I’ll take a picture of it tomorrow. Fits very nicely.
4. Yes, it’ll work.
5. Yes, it’ll work
6. Yes, it’ll work quite well.