BLF Interest list for Very High Current Beryllium Copper springs Pt1(ENDED)

[Texas_Ace]

@BlueSwordM

Two reasons actually:

1. I could go with 1.1mm or 1.2mm wire. However, the 1.1mm wire is a non standard option, so it will cost more to manufacture. But the 1.2mm wire has the same cost, so no problem there.

2. 1mm wire is already very thick for a battery spring, compared to most springs on the market already. Going with a 1.2mm wire, while better on the current handling side, will make the spring mechanically weaker.

There is a reason: free length between coils. This is for non-plastic deformation to occur at a certain compression force.

If the wire is too thick, what will happen is that under a deformation is that there’s a possibility of coils touching each other. This can end in two things: either the spring collapses at that point, or worse, the spring is stressed in a horizontal way, which will permanently deform the spring.

Either way, a thicker spring at a small size will be mechanically weaker.

Makes sense, 1mm should work for most small lights that don’t see more then 15A

[BlueSwordM]

Yeah. I’ll probably do a comparison of all the springs I currently own, which is the Fasttech Carobronze spring, the Kaidomain Phosphor Bronze Spring, and soon enough, the BLF BSM U-Spring.

From my calculations, it should handle 14-15A before it has a voltage drop of 0,100V occurs, but I will have to confirm that once I receive them.

They are looking to be quite promising.

[joechina]

Wikipedia says you shouldn’t grind CuBe without respirator.

I found also regulations for beryllium powder:
http://gestis-en.itrust.de/nxt/gateway.dll/gestis_en/008020.xml?f=templates\$fn=default.htm\$3.0
Capter regulation seems worth a read. The rest I mostly don’t understand.

So do we need a saftey note for the springs, if somebody cut them with a Dremel?

[DB_Custom (Dale)]

Use wire snips to cut them, why on earth would anyone try to grind a springy spring?

I don’t have immediate funds for this but in the next couple of weeks I should… if that is ok I’d like to speak up for…
100 large and 50 small please.

If we have leftover’s I’d probably help you (and me) out there and buy more as well, all dependent of course on the testing of the samples.

The CaroBronze springs aggravate me as they don’t take solder well and are so stiff. The heavier Intl-Outdoor spring collapses under heavy loads (high current) and is difficult to bypass because of the thick wire and short height. So yes, I would like to stock my parts box with these more ideal BSL LS springs.

Thanks JoeChina for making me think about this more…

[teacher]

Maybe we can get up an accompanying Group Buy for those that have real concerns about the safety of these springs or might want to cut them in a manner that would create & cause dust.

I present……… ‘The BLF Respirator’.
.

.
:+1: … … …
.
Optional Full Facemask model……

.
Or…. be the first on your block to be completely protected from BLF BSM U-Spring dust!

……
…….
……

[BlueSwordM]

Huh? The Carobronze springs are stiff? It has been the opposite experience for me.

And why would you cut springs with a dremel?

And the Intl Outdoor spring will almost always end up in a plastic deformation after being deformed, as the Beryllium Copper used in this spring has the weakest yield strength of all BeCus, no matter the current you pass through them. It is a great spring for IntlOutdoor lights, but not most other lights.

And you have been added to the interest list DB Custom.

[Texas_Ace]

Oh, I didn’t realize there were 2 sizes, yeah I will take 40 small springs as well.

[DB_Custom (Dale)]

Teacher, you forgot the link on the full face model.

Seriously, that is something I can see coming in very handy!

[teacher]

@DB Custom

Teacher, you forgot the link on the full face model.

Seriously, that is something I can see coming in very handy!

Sorry my friend, no links were provided on any.

Yep…. That full face mask could come in real handy from time to time. I just use my half respirator & a face shield in those situations now. BUT that combo is awkward & clumsy. :person_facepalming:

[DavidEF]

@Mr.Scott

@DavidEF

If the price per spring is more than double for quantity of 1000 versus 2000, then it is ridiculous to buy 1000 and pay actually more for fewer springs. For instance, if the price is $0.175/ea for 2000pcs but it is $0.50/ea for 1000pcs, the real total cost is $350 for 2000pcs but it is $500 for 1000pcs! There is no sense paying more for the privilege of receiving less! I’m not saying this is the actual cost per 1000. I’m just saying that if the difference is double or more, it doesn’t make sense at all to do it. From that, you can calculate the highest “premium” that would make any sense to buy, being $0.345/ea for 1000, or just under double price. Then again, you’d still have to be silly to pay such a difference, IMHO. But, if we use that number, the total cost for 2000 lg + 1000 sm springs can’t be more than $350 + $345 (+ $100 for samples) = $795 TOTAL! That makes the average price of a spring just a bit over $0.26/ea plus shipping from Bluesword to each of the group buy participants. The more you buy as an individual, the lower your per-spring cost will be!

Yes, but the cost of $0.26 assumes all are sold. Not fair if Bluesword gets stuck holding unsold springs. If this was a business, that is one of the risks, but since this is a group buy we should consider sharing the cost of unsold stock. Just not sure how to do that fairly.

Yeah, I wouldn’t suggest he pass them on at that price, especially since he has to do all the re-packing and shipping. I also don’t like the idea of GB participants paying for ALL the springs, leaving so many extras that are “free”. I’d say that somewhere in the middle is a fair price, but I don’t pretend to know what that is. :zipper_mouth_face:

[DB_Custom (Dale)]

He’s not going to get stuck holding extra’s. I promise you that. Several of us here will up our ante in the long game and there won’t be anything left. By the time that all get’s sorted out and he see’s what is left I’ll know if I can take an extra hundred, or two. Some other’s will do the same thing, problem solved.

If this were tax return time I might be prone to buy a thousand myself. Of course, it’s not, monies are all more tightly controlled right now and we have to start thinking about Christmas soon. (I know, right?)

[teacher]

@DB Custom

He’s not going to get stuck holding extra’s. I promise you that. Several of us here will up our ante in the long game and there won’t be anything left. By the time that all get’s sorted out and he see’s what is left I’ll know if I can take an extra hundred, or two. Some other’s will do the same thing, problem solved.

Exactly…. :+1:

@DB Custom

If this were tax return time I might be prone to buy a thousand myself. Of course, it’s not, monies are all more tightly controlled right now and we have to start thinking about Christmas soon. (I know, right?)

WELL…… you could always get yourself a thousand or two & use them as stocking stuffers…. your stocking of course.

Maybe give the ’little woman’ a thousand too……. hide a piece of jewelry for her in the springs & you might actually get away with that. .

[Texas_Ace]

indeed, if there are some left over I could easily order quite a few more myself. Heck if I have the money I plan to order extras as it is. Just waiting for things to settle down so I can see how much I can afford.

[skinny_tie]

My initial request (20+20) was based on my available hobby funds, but if the price drops from the original estimate or ther are some surplus springs I’d love to get a few more. The prospect of never bypassing another spring is very appealing.

[JasonWW]

I’m sorry I haven’t read this thread, just post 1.

I wanted to ask if the large spring is going to be 7 mm on the top and 9 mm on the bottom? Typically you would want to get a smaller top so that you have more of a tapered shape. This will allow the spring to partially compress into itself allowing for a shorter compressed height and allowing a wider range of battery lengths to fit. When the spring is shaped more like a cylinder you just don’t get as much compression from it.

If this has already been discussed, just ignore my post above. Thanks

[BlueSwordM]

OK then.

You are lucky that I will only order the samples Thursday.

[teacher]

@JasonWW

I’m sorry I haven’t read this thread, just post 1.

I wanted to ask if the large spring is going to be 7 mm on the top and 9 mm on the bottom? Typically you would want to get a smaller top so that you have more of a tapered shape. This will allow the spring to partially compress into itself allowing for a shorter compressed height and allowing a wider range of battery lengths to fit. When the spring is shaped more like a cylinder you just don’t get as much compression from it.

If this has already been discussed, just ignore my post above. Thanks

Yep… from the OP.

• - Spring upper diameter: 7mm

• - Spring base diameter: 9mm

• - Spring thickness: 1mm

• - Spring height: 12mm

• - Plating: Zinc plating

[JasonWW]

@teacher

@JasonWW

I’m sorry I haven’t read this thread, just post 1.

I wanted to ask if the large spring is going to be 7 mm on the top and 9 mm on the bottom? Typically you would want to get a smaller top so that you have more of a tapered shape. This will allow the spring to partially compress into itself allowing for a shorter compressed height and allowing a wider range of battery lengths to fit. When the spring is shaped more like a cylinder you just don’t get as much compression from it.

If this has already been discussed, just ignore my post above. Thanks

Yep… from the OP.

• - Spring upper diameter: 7mm

• - Spring base diameter: 9mm

• - Spring thickness: 1mm

• - Spring height: 12mm

• - Plating: Zinc plating

No one in 180 posts has suggested to make the big spring have a 5mm top diameter?

Doing so might allow an extra millimeter or two longer battery to fit.

It’s something to think about (assuming the company is capable of doing it).

[DB_Custom (Dale)]

I would just cut off a coil if the cell was too long or if it looked like there would be issues. By cutting off a coil (or two) at the wide base the overall length would be shortened and the cell length wouldn’t be as critical.

Then again, I tend to forget what I’ve found to be optimal and find a new solution every time the problem arises…

[Texas_Ace]

@JasonWW

@teacher

@JasonWW

I’m sorry I haven’t read this thread, just post 1.

I wanted to ask if the large spring is going to be 7 mm on the top and 9 mm on the bottom? Typically you would want to get a smaller top so that you have more of a tapered shape. This will allow the spring to partially compress into itself allowing for a shorter compressed height and allowing a wider range of battery lengths to fit. When the spring is shaped more like a cylinder you just don’t get as much compression from it.

If this has already been discussed, just ignore my post above. Thanks

Yep… from the OP.

• - Spring upper diameter: 7mm

• - Spring base diameter: 9mm

• - Spring thickness: 1mm

• - Spring height: 12mm

• - Plating: Zinc plating

No one in 180 posts has suggested to make the big spring have a 5mm top diameter?

Doing so might allow an extra millimeter or two longer battery to fit.

It’s something to think about (assuming the company is capable of doing it).

This is a good suggestion, the only reason I would see for leaving it larger would be if we made a smaller spring that could fit inside of it for a double high current spring setup.

Honestly I have been to busy to even read BLF, I only found out about this because someone was nice enough to point it out to me in a PM.

We almost need a BLF highlights thread to links to important developments on BLF daily / weekly lol.