Search found 1849 matches

by Hummina Shadeeba
Jan 06 2021 11:44am
Forum: General Discussion
Topic: Why my lights, tv, and everything else isn’t flickering.
Replies: 7
Views: 224

Re: Why my lights, tv, and everything else isn’t flickering.

Surely some electronic devices require a continuous current as apposed to one that is a sine wave going up n down through zero, no? An incandescent bulb’s flicker makes sense with a lower frequency as the current flickers and the subsequent heat in the filament going below a temp to produce light......
by Hummina Shadeeba
Jan 05 2021 1:57pm
Forum: General Discussion
Topic: Why my lights, tv, and everything else isn’t flickering.
Replies: 7
Views: 224

Why my lights, tv, and everything else isn’t flickering.

Being ac and 60hz what keeps the current continuous? Regardless of the frequency.
by Hummina Shadeeba
Jan 05 2021 1:55pm
Forum: General Discussion
Topic: Gloves for working with batteries and electronics
Replies: 9
Views: 491

Re: Gloves for working with batteries and electronics

I wear just one glove that has no possibility of ripping leaving a sweaty inlet. and glasses
by Hummina Shadeeba
Jan 04 2021 6:36pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1220
Views: 181725

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

I’m finding the battery amp ability and voltage makes a huge difference


***I CAN WELD .1MM COPPER WITH JUST 10 JOULES***
i think also depends on the cells and these a123 26650s have harder to weld positive side..but then thats the side i can even weld with just 10 joules.
by Hummina Shadeeba
Jan 02 2021 11:37am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 71
Views: 5110

Re: what is cogging torque?

i didnt do any math but hysteresis seems a loss at much higher frequencies than would be noticeable when coasting down the street at 5mph. a good test would maybe be to replace the stator with metal with a tighter or looser hysteresis loop to compare but i dont have that available. id think the swit...
by Hummina Shadeeba
Jan 02 2021 11:07am
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1220
Views: 181725

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

The 0.10mm thick copper may sound thin, but since copper is four times more conductive, with 1/4th the resistance (compared to nickel), the 0.10mm copper is equal in current-carrying ability to 0.40mm thick nickel. It's also cheaper and more readily available locally than nickel, plus easier to cut...
by Hummina Shadeeba
Jan 01 2021 9:52pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 471
Views: 62130

Re: BOSS LEVEL CUSTOM SPOT WELDER

Sure you can. But you do need some experience with a solder iron. It's not what I would call easy. im pretty good at soldering. just unscrewed the bottom plate which seems closest to the fets and its not coming off easily. i thought was just held with thermal paste to the fets but is it more?
by Hummina Shadeeba
Jan 01 2021 7:12pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1220
Views: 181725

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

What settings u use for .1mm copper? Around 50 joules with my 1500A battery. With copper amps matter a lot more because weld time should be as short as possible to make sure energy is used to weld and not just heating copper around the weld.. With nickel or steel on top method I have not tried yet ...
by Hummina Shadeeba
Dec 31 2020 11:03am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69688

Re: Spot Welding Copper Strips to 18650 Battery Cells

Why’d you make it two batteries instead of one?
by Hummina Shadeeba
Dec 31 2020 10:52am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 471
Views: 62130

Re: BOSS LEVEL CUSTOM SPOT WELDER

I see them for sale on eBay. Guess they’re still for sale. Need something stat if u know a welder that can do .1mm copper. It will do nickel plated 0.15mm copper. Like these: https://www.ebay.com/itm/Pure-Nickel-Plated-Copper-Strip-Tab-0-15mm-x-8mm-18650-US-Sales/133104900617?var=432415150001&_...
by Hummina Shadeeba
Dec 30 2020 2:59pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69688

Re: Spot Welding Copper Strips to 18650 Battery Cells

Now just need to attach some balance leads (no BMS in this pack). Any recommendations on compact connectors I can mount on the packs for the occasional balancing exercise (99% of the time these packs will just be bulk charged). Was thinking of either sub-d or pcb headers. You need reliable bullet-p...
by Hummina Shadeeba
Dec 30 2020 12:47pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 471
Views: 62130

Re: BOSS LEVEL CUSTOM SPOT WELDER

I see them for sale on eBay. Guess they’re still for sale. Need something stat if u know a welder that can do .1mm copper.
by Hummina Shadeeba
Dec 30 2020 12:37pm
Forum: Items for Sale - New
Topic: Malectrics Arduino Spot Welder v2.2 - never used
Replies: 1
Views: 334

Re: Malectrics Arduino Spot Welder v2.2 - never used

Will this do .1mmcopper? I’ll buy it
610-416-2650
John
by Hummina Shadeeba
Dec 30 2020 12:24pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1220
Views: 181725

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

What settings u use for .1mm copper?
by Hummina Shadeeba
Dec 30 2020 11:57am
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 471
Views: 62130

Re: BOSS LEVEL CUSTOM SPOT WELDER

Mine says fet error and won’t work. Anyone fix these? I’m in need of something that will weld .1mm copper so I can finish this battery. Any recommendations for something I can get fast to Cali? It said fet error after I welded without the cell being pressed firmly and causing a big blowout in the .1...
by Hummina Shadeeba
Dec 29 2020 11:23pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 433
Views: 69688

Re: Spot Welding Copper Strips to 18650 Battery Cells

Power leads have been attached. I 'butterflied' 8awg silicone cable and soldered to a piece of copper which was then welded to the cells. I formed a channel in the copper to wrap around the wire increasing the joint strength. Now just need to attach some balance leads (no BMS in this pack). Any rec...
by Hummina Shadeeba
Dec 29 2020 11:19pm
Forum: Battery Technology
Topic: BOSS LEVEL CUSTOM SPOT WELDER
Replies: 471
Views: 62130

Re: Spot Welding Copper Strips to 18650 Battery Cells

my Boss spot welder flickers "fet error" and beeps, and i turn it on and off a couple times and the flickering stops and it works again. i go back to welding and again make another big blowout with no cell behind the copper shooting blindly, and it goes back to flickering "fet error&q...
by Hummina Shadeeba
Dec 29 2020 11:54am
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 71
Views: 5110

Re: what is cogging torque?

[ Cogging analogy.jpg Where’d you get this analogy drawing or you make it? With the ball on track analogy, if using a flat track the speed and mass of the ball can determine what valley it eventually gets stuck in. The ball’s momentum determining how far it will go on the level track. I don’t under...
by Hummina Shadeeba
Dec 26 2020 9:45pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 71
Views: 5110

Re: what is cogging torque?

when your magnetic coupling lost it's lock and I guess would be cogging, you say the current draw was very nearly the same as when no magnet there but what did you see and how accurate? It was a while ago, but I was using a small ironless brushed motor as the driver and had a very precise current m...
by Hummina Shadeeba
Dec 25 2020 11:34pm
Forum: Motor Technology
Topic: what is cogging torque?
Replies: 71
Views: 5110

Re: what is cogging torque?

There aren't significant losses caused just by cogging. All the losses are like you stated, eddy currents, hysteresis, bearing friction and windage. Cogging might slightly increase bearing friction as there will be parts of the cycle where bearing loads are higher than average, but it's not signifi...
by Hummina Shadeeba
Dec 22 2020 6:03pm
Forum: Motor Technology
Topic: how do these simplest motors work?
Replies: 7
Views: 242

Re: how do these simplest motors work?

mxlemming wrote:
Dec 22 2020 4:25pm
Only strips half the insulation on the wire so for half the revolution there no conductivity. That's all.
Ooooo. Sorry just read this. I didn’t see that in the video.
by Hummina Shadeeba
Dec 22 2020 6:03pm
Forum: Motor Technology
Topic: how do these simplest motors work?
Replies: 7
Views: 242

Re: how do these simplest motors work?

ZeroEm wrote:
Dec 22 2020 4:40pm
Timing is used
?
by Hummina Shadeeba
Dec 22 2020 6:01pm
Forum: Motor Technology
Topic: how do these simplest motors work?
Replies: 7
Views: 242

Re: how do these simplest motors work?

Neither of these motors has a switch or option to stop pressure on a pedal. If using a cycling analogy it seems to me more like u just pushed hard with one foot on a pedal and will be pushing that one foot till finally disconnect the battery. The battery and coil make an electromagnet of one polarit...
by Hummina Shadeeba
Dec 22 2020 3:11pm
Forum: Motor Technology
Topic: how do these simplest motors work?
Replies: 7
Views: 242

Re: how do these simplest motors work?

making an electromagnet with battery and a wire I understand but how is the motor spinning? why doesnt the field line up with the permanent magnet and get stuck, and how is the coil instead of the magnet enabling the motor to spin?
by Hummina Shadeeba
Dec 21 2020 7:32pm
Forum: Motor Technology
Topic: how do these simplest motors work?
Replies: 7
Views: 242

how do these simplest motors work?

https://www.wikihow.com/Build-a-Simple-Electric-Motor
with a magnet.

https://www.youtube.com/watch?v=w-3C7ZA32tU
without a magnet


without an esc to switch the polarity what is making it not lock up?