You see, the company which I was going to pay for the samples originally, boosted the price aā¦ bit.
It went for 100$US+shipping, to 135$US+shipping, so quite a bit more expensive.
This is getting quite annoying, and expensive just for some spring samples.
I think Iāll just take the risk, and go with my original plan of just buying the 2000 springs from my original manufacturer, since while the prices are the same from both sellers using BeCu C17530, the one I was going to go with is being just absurd with the samples cost.
Since this is my hobby money, Iām willing to take a risk.
Edit: Iām just going to keep looking for a supplier that is willing to even get 1 spring sample.
And besides, I have Paypal to protect just in case something goes horribly wrong, like springs not being made of BeCu C17530, which is quite easy to test just by its electrical properties.
After careful considerations, I have decided to order the 2000 big springs first since they are the most popular, and I can validate their mechanical and electrical properties much more easily than with a small spring for good reason, and easier to prototype in a light.
Here are the final specs of the spring:
- Material: C17530 (Beryllium Copper) with IACS of 38%
- Spring upper diameter: 7mm
- Spring base diameter: 9mm
- Spring thickness: 1mm
- Spring height (free height): 12mm
- Plating: Electroplated zinc
Total number of coils: 6
The small springs will be ordered afterwards if the big springs are excellent.
I just want to make sure if everybody is okay with this, and is okay with the amount of springs they ordered
_
I am going with a 7mm top diameter because I have calculated that the yield strength is stronger with a 7mm top diameter rather than a 6mm top diameter because of the small bottom diameter of the spring, so there is a lower chance of plastic deformation occurring wider diameter.
Iām going to be paying for the springs real soon.
If we are lucky, we should have have in 2-3 weeks, 4 if we are unlucky.
Edit: Another thing.
Would you mind if I make the spring 1-1.5mm taller? Just for all types of cells to be accounted for, and small plastic deformation with aging just in case.
I do think these springs have a lot of potential though.
With sufficient traction, maybe, just maybe, we can get them in other lights, like the BLF Q8 V1.5 I posted a thread about, a new special light from someone you really like, etc.
I have had issues with springs not being tall enough but rarely had a problem with it being too tall.
So an extra 1mm height sounds good to me.
I wounder if dropping the top size to 6mm might be a good idea as well, that way you could flip it upside down for drivers that have very small spring pads (like the TA 17mm).