Search found 11133 matches

by spinningmagnets
Dec 17 2020 2:15pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77742

Re: Spot Welding Copper Strips to 18650 Battery Cells

This is why these pics are important, few have posted the inside of the can. Use the lowest setting that forms a solid connection, and then...whatever the inside looks like is the standard to measure by. Also, if the setting you are getting good results with makes the welder very hot, you might get ...
by spinningmagnets
Dec 17 2020 1:19pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 458
Views: 77742

Re: Spot Welding Copper Strips to 18650 Battery Cells

That's a great result, and thanks for posting the pics here. Can I use these pics as an example? (of course, I would credit you)
by spinningmagnets
Dec 17 2020 8:50am
Forum: Battery Technology
Topic: 18650 spotweld vs. solder steel vs nickel rust confusion
Replies: 6
Views: 436

Re: 18650 spotweld vs. solder steel vs nickel rust confusion

There has recently been some experimentation with the "copper / nickel sandwich" method, and the results have been very good. Copper conducts well, with little resistance or waste heat. Also, it is relatively cheap and available. But it is very difficult to spot-weld. Nickel and also nicke...
by spinningmagnets
Dec 11 2020 11:46am
Forum: Battery Technology
Topic: Diagnosing potted battery pack | Premature Failure | Cells or BMS?
Replies: 21
Views: 653

Re: Diagnosing potted battery pack | Premature Failure | Cells or BMS?

Authentic 30Q's are good, but their popularity has led to the market being flooded with counterfeits. I like potting for water proofing and shock resistance. However, I would not pot the BMS. I would just have the multi-wire connection between the pack and BMS be water-proofed with dielectric grease...
by spinningmagnets
Dec 09 2020 8:10am
Forum: Battery Technology
Topic: Is a little rust normal for nickel strip in salt water
Replies: 12
Views: 720

Re: Is a little rust normal for nickel strip in salt water

I dont know if theres a purity test for copper that would be easy for DIY garage builders. Even if there is some admixture from a cheap copper recycler, just check the resistance in ohms with a multimeter. The reading wouldnt have to be precise. As long as it's very high conductivity and very low re...
by spinningmagnets
Dec 08 2020 3:15pm
Forum: Battery Technology
Topic: Is a little rust normal for nickel strip in salt water
Replies: 12
Views: 720

Re: Is a little rust normal for nickel strip in salt water

First, check out the copper/nickel sandwich discussion.
by spinningmagnets
Dec 05 2020 10:24pm
Forum: E-Scooter and Motorcycle Build Threads
Topic: 1962 Honda Benly goes electric
Replies: 33
Views: 3096

Re: 1962 Honda Benly goes electric

Beautiful work! Please continue to post the build pics as it progresses.
by spinningmagnets
Dec 05 2020 8:48am
Forum: EBike bike frame/part discussion
Topic: Suron Frame for $350?
Replies: 6
Views: 821

Re: Suron Frame for $350?

I'm certain its a scam, and any money ent will never bee seen again. However, there's only one way to find out.

Also, if you actually get the frame, where will you get the fork, wheels, battery and motor, along with all the other hundreds of parts?
by spinningmagnets
Dec 04 2020 10:16am
Forum: Battery Technology
Topic: jonescg's cylindrical cell build thread
Replies: 59
Views: 2619

Re: jonescg's cylindrical cell build thread

Beautiful work, thanks for posting.
by spinningmagnets
Dec 02 2020 10:44am
Forum: Battery Technology
Topic: jonescg's cylindrical cell build thread
Replies: 59
Views: 2619

Re: jonescg's cylindrical cell build thread

Jonescg, have you seen the threads using the copper/nickel sandwich method for series?

I dont know if it would be appropriate for this build, but I thought it was worth mentioning.
by spinningmagnets
Nov 29 2020 1:50pm
Forum: EBike Build Threads
Topic: The Wood Chopper
Replies: 2
Views: 345

Re: The Wood Chopper

Well done! Even if someone doesn't like this particular style, this is a great example of how you can affordably make a bike frame with any style you like.

There are a few bikes from Rans that I like, but the cheapest one is VERY expensive.
by spinningmagnets
Nov 26 2020 10:26am
Forum: E-Vehicles General Discussion
Topic: is my AWG holding me back?
Replies: 5
Views: 883

Re: is my AWG holding me back?

Motors can take a lot of inductance without suffering any harm, such as heat or transient voltage spikes. Controllers have capacitors for smoothing the voltage spikes, but the higher the inductance, the more you are constantly punching them in the gut. The battery to controller wires should be short...
by spinningmagnets
Nov 25 2020 5:19pm
Forum: Forum Rules and Features
Topic: If you had the chance to start endless sphere all over again, what would you change?
Replies: 54
Views: 1940

Re: If you had the chance to start endless sphere all over again, what would you change?

I moderate about 20% on the phone, and 80% laptop.

Checking in on the phone helps to catch some issues so I can lock flame-threads as soon as possible, and split hairs when I get home....
by spinningmagnets
Nov 25 2020 7:56am
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 38
Views: 3200

Re: "Copper/nickel sandwich" buses for series connections

I haven't really investigated materials with good thermal properties that were not conductive.

It's a worthwhile study, but the frequent suggestion is using high-amp cells so they ruin cool at normal loads, and also having a pack big enough to easily supply the normal amp work-loads.
by spinningmagnets
Nov 25 2020 7:46am
Forum: Forum Rules and Features
Topic: If you had the chance to start endless sphere all over again, what would you change?
Replies: 54
Views: 1940

Re: If you had the chance to start endless sphere all over again, what would you change?

When I see a shotgun spam attack, instead of deleting them, my immediate main effort is to ban the names as quickly as possible, since some of the posts are very rapid and they can post more faster than I can delete. (edit, I now know how to use the ban-hammer) I don't know if a 5-minute freeze of t...
by spinningmagnets
Nov 24 2020 8:43am
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 38
Views: 3200

Re: "Copper/nickel sandwich" buses for series connections

The 0.15 copper sheet is what I am most interested in. It can handle the highest currents coming from 21700 cells. Even if 0.10mm copper works for the common 18650 cells, if there is a way to get the 0.15 copper to work on cylindrical cells, why not not use 0.15 on everything? It makes a great heat ...
by spinningmagnets
Nov 24 2020 8:36am
Forum: EBike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 8328
Views: 909331

Re: New "TSDZ2 Torque Sensor Central Motor"

Glad to see you back, Chalo...
by spinningmagnets
Nov 23 2020 3:15pm
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 38
Views: 3200

Re: "Copper/nickel sandwich" buses for series connections

By passing the welding current through two separate strips that are not touching, you force the current to pass through the cell-tip, instead of most of the current simply passing through the bus-strip from one probe-tip to the other...
by spinningmagnets
Nov 23 2020 1:43pm
Forum: EBike General Discussion
Topic: Shave seat tube???
Replies: 9
Views: 560

Re: Shave seat tube???

I like that you drilled a hole at the base of the split-cut.

If you didnt, a "stress riser" might develop, and a possible crack might grow in unpredictable directions...
by spinningmagnets
Nov 23 2020 1:37pm
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 38
Views: 3200

Re: "Copper/nickel sandwich" buses for series connections

Thank you for posting those results. This kind of experimentation is vital to discovering the best possible materials and methods. Since copper is four times as conductive as nickel, a 0.10mm thick copper strip (for series) is as conductive as 0.40mm thick nickel. Due to the lower resistance of copp...
by spinningmagnets
Nov 21 2020 7:53am
Forum: EBike General Discussion
Topic: Shave seat tube???
Replies: 9
Views: 560

Re: Shave seat tube???

I wanted the seat as low as possible. Slide the clamp down as low as it would go to mark a half-inch above it. Remove the clamp Slide an automotive hose-clamp onto the tube (to where the seat clamp was) to act as a guide for the hacksaw. Cut the tube at the mark Cut a slice down the back (angle grin...
by spinningmagnets
Nov 20 2020 9:45pm
Forum: EBike General Discussion
Topic: Shave seat tube???
Replies: 9
Views: 560

Re: Shave seat tube???

I did that years ago, and no cracks have formed. Seat tube still works fine.
by spinningmagnets
Nov 13 2020 1:05pm
Forum: EBike General Discussion
Topic: Wireless Backup Camera as rear view mirror.
Replies: 7
Views: 625

Re: Wireless Backup Camera as rear view mirror.

"I like high tech stuff, like my tail light with its anti-theft alarm"

Brand and part number?
by spinningmagnets
Nov 12 2020 6:03pm
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 38
Views: 3200

Re: "Copper/nickel sandwich" buses for series connections

From Rio Cole on Facebook. 0.10mm copper, 0.15 nickel-plated steel . kWeld setting 60 joules. Rio states that the steel ribbon welds easier with a lower setting compared to pure nickel ribbon. This makes sense because the higher resistance of steel would get hotter per the same amount of amps at the...