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by spinningmagnets
Oct 16 2021 1:38pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1479
Views: 224194

Re: kWeld - "Next level" DIY battery spot welder

Several posts here have been flagged as "off topic". They can be moved to another discussion, or deleted by the moderator board. Since I used to be a retailer for the kWeld, I am being very patient to avoid conflict. If a Malectrics discussion began receiving posts about the kWeld, the rul...
by spinningmagnets
Oct 16 2021 9:31am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1479
Views: 224194

Re: kWeld - "Next level" DIY battery spot welder

This sounds interesting. Pease start a thread about copper spot-welding your super-capacitors. Im certain quite a few builders would be interested...
by spinningmagnets
Oct 15 2021 12:24pm
Forum: General Discussion
Topic: how about a 3d printer section?
Replies: 186
Views: 3351

Re: how about a 3d printer section?

Which printer did you end up getting?
It was a gift two years ago, and I actually don't remember which model.

Sometimes I feel like I have three jobs. When I retire, maybe I can squeeze some fun projects in between the two remaining jobs...
by spinningmagnets
Oct 14 2021 3:00pm
Forum: Motor Technology
Topic: Delta Vs Star Connection...Pros and Cons
Replies: 3
Views: 270

Re: Delta Vs Star Connection...Pros and Cons

Delta has a slightly higher kV, which is RPM's per volt.

Star is sometimes called Wye
by spinningmagnets
Oct 13 2021 6:31pm
Forum: General Discussion
Topic: how about a 3d printer section?
Replies: 186
Views: 3351

Re: how about a 3d printer section?

It looks like when I'm indoors this winter, I will have some time to finally unbox my 3D printer.

What drawing programs are you all using? And/or recommend?
by spinningmagnets
Oct 13 2021 4:55pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1479
Views: 224194

Re: kWeld - "Next level" DIY battery spot welder

Thank you for the clarification about the details of that very nice machine. I was the north American retailer of the kWeld for one year. Due to sales growth, Frank was going to need someone full-time. I have a full-time job, and could not give that business the attention it needed, so Frank found s...
by spinningmagnets
Oct 13 2021 12:37pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1479
Views: 224194

Re: kWeld - "Next level" DIY battery spot welder

I was quite excited to read and share the information about the "copper / nickel sandwich" method. In fact the cheaper "nickel-plated steel" buses are best because the higher resistance of steel will convert the welding amps into enough heat with less energy. Of course, it doesn'...
by spinningmagnets
Oct 12 2021 7:47pm
Forum: Motor Technology
Topic: List of available motors and controllers
Replies: 3
Views: 172

Re: List of available motors and controllers

Here's a few names of controllers to start a search

Adaptto
Alltrax
ASI/BAC
Kelly
Mobipus
Nucular
Phaserunner
Sabvoton
Sevcon
Silixcon
Votol

QS...For cylindrical motors, its hard to compete with Quan Shun
Motenergy...Used by Zero motorcycles
AGNI/Lynch...Axial Flux
by spinningmagnets
Oct 12 2021 10:18am
Forum: Motor Technology
Topic: Building a diy friendly motor
Replies: 4
Views: 241

Re: Building a diy friendly motor

its fun to experiment, and I encourage you to explore. That being said...

For a DIY motor, I am a fan of the Lebowski Axial. Can be made with one, two, or three stators. Look in the motor section, at the stickey index...
by spinningmagnets
Oct 12 2021 10:14am
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2816

Re: How do you think solid state batteries will change how we use hardware?

this thread is straying into a discussion on voltage-switching snd adjustable throttle limits. Perhaps those interested wouldn't mind if I split this off into its own thread? [No mention of solid state batteries for a while now?] Years ago, we didn't have many choices for 72V batteries or high-amp c...
by spinningmagnets
Oct 07 2021 4:49pm
Forum: EBike Technical
Topic: Copper strips versus nickel strips on battery packs?
Replies: 9
Views: 4613

Re: Copper strips versus nickel strips on battery packs?

This is the "copper/nickel sandwich" method. Copper and aluminum take extremely high amps to spot-weld by themselves. However, if you put nickel over the vopper, the resistance of the nickel turns the current into lots of heat. This means you get an adequate amount of heat in a tiny spot, ...
by spinningmagnets
Oct 06 2021 9:29pm
Forum: General Discussion
Topic: how about a 3d printer section?
Replies: 186
Views: 3351

Re: how about a 3d printer section?

A while back, I looked at some videos on using a "lost PLA" casting method. Fascinating stuff. 3D print a part with low infill and smooth/solid skin. Cover in a layer of high-temp plaster. Pack in a sand-box for casting metal. Heat to cure the plaster and drain the low-temp plastic. Then, ...
by spinningmagnets
Oct 04 2021 8:31pm
Forum: General Discussion
Topic: Orgainzing bookmarks bar
Replies: 21
Views: 372

Re: Orgainzing bookmarks bar

Start at "Home" Go to the section that might have subject matter on the topic you have a question on it. For example, go to the "Battery Technology" section... Then, go to..."Sticky thread index for Battery Technology " [the last two words can be Motor Technology, Ebike...
by spinningmagnets
Oct 03 2021 10:47pm
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2816

Re: How do you think solid state batteries will change how we use hardware?

Did you use EV Warrior parts for that bike?
It was made from scratch, but it was very similar in its operation...from 2010 (*am I really that old?)

viewtopic.php?f=28&t=21365&start=75#p336206
by spinningmagnets
Oct 03 2021 9:31pm
Forum: EBike General Discussion
Topic: How do you think solid state batteries will change how we use hardware?
Replies: 119
Views: 2816

Re: How do you think solid state batteries will change how we use hardware?

My first Ebike is was a DIY friction-drive. The "drag" when unpowered is theoretical. For me, it was never a problem. The tire-roller was held onto a shaft by two one-way clutch-bearings...
by spinningmagnets
Oct 03 2021 6:24pm
Forum: EBike Troubleshooting
Topic: Bullet to XT90 adapter?
Replies: 2
Views: 126

Re: Bullet to XT90 adapter?

Scan the pics in the article. The important part is to interlace the strands from both wires first, whether you crimp or solder.

Good for low electrical resistance/high conductivity, plus good for mechanical pull-out strength...
by spinningmagnets
Oct 03 2021 5:20pm
Forum: EBike Troubleshooting
Topic: Bullet to XT90 adapter?
Replies: 2
Views: 126

Re: Bullet to XT90 adapter?

If you buy a pigtailed XT90 set, you can connect them to the battery and controller cables with a crimping connector.

I still prefer solder and 3:1 marine heat shrink for that...using the Amberwolf method.

https://www.electricbike.com/connectors ... tle-motor/
by spinningmagnets
Oct 03 2021 3:47pm
Forum: Bike Mechanical & Structural
Topic: The wheel-building spoke-lacing thread, post your tips
Replies: 263
Views: 53673

Re: The wheel-building spoke-lacing thread, post your tips

https://www.electricbike.com/moped-rims ... hubmotors/

Thanks again, to the many ES members who contributed data and pics for this article. It has been read many thousands of times...
by spinningmagnets
Oct 02 2021 8:25pm
Forum: Bike Mechanical & Structural
Topic: The wheel-building spoke-lacing thread, post your tips
Replies: 263
Views: 53673

Re: The wheel-building spoke-lacing thread, post your tips

For a 20-inch size of bicycle wheel, I'd prefer a one-cross on a 16-inch moped rim (same actual size, but has angled nipple holes), but...nothing wrong with a radial-laced bicycle rim...
by spinningmagnets
Oct 01 2021 8:30pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1479
Views: 224194

Re: kWeld - "Next level" DIY battery spot welder

I've always spot-welded cells at room temperature. Putting them in a freezer is something that I was assured would not hurt them when I researched long-term storage of lithium cells. I had always heard that putting them where the temps were "cool", was better than storing it in a hot summe...
by spinningmagnets
Oct 01 2021 6:32pm
Forum: Motor Technology
Topic: DIY Toroidal Axial Flux PM
Replies: 271
Views: 12604

Re: DIY Toroidal Axial Flux PM

I have read about some users building an insulated box around the 3D printer to hold the heat in, which reduces the energy needed to get the bed hot enough.

One side is see-through window, either glass or polycarbonate...
by spinningmagnets
Oct 01 2021 6:29pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1479
Views: 224194

Re: kWeld - "Next level" DIY battery spot welder

how much heat does this put into the cell? I hadn't thought about putting the cells in the freezer, thats a brilliant idea. For low cell heat, use the kWeld and the "copper nickel sandwich" method, even if you don't really need the high-amp copper series buses...the moment the weld-pulse ...
by spinningmagnets
Sep 30 2021 9:34pm
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 115
Views: 9904

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

Buses not complete at the time of that pic. The two groups at the top are the end-collector cells for the positive and negative cables to the controller. Here's the same pack, a little farther along. If you look close, you can see the top right bus has the edge bent over the top, and there is a hori...
by spinningmagnets
Sep 30 2021 8:26pm
Forum: Battery Technology
Topic: "Copper/nickel sandwich" buses for series connections
Replies: 115
Views: 9904

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

From "Ian M Molina"
Facebook "18650 Battery Builders"
84V, kWeld
0.15mm copper
BatteryCNsandwich1.jpg
A
BatteryCNsandwich1.jpg (495.79 KiB) Viewed 189 times