Endless Sphere

Can someone please measure what is the maximum thickness of the bottom bracket to allow installation of this motor? I want to install it on a carbon frame and the BB wall on carbon frames is thicker than aluminum and SS.

I wish this topic about the extra insulation came up 2 weeks earlier... I did read a ton of information before building my battery and this never came to my attention. I just hope my battery holds with no problems for a long time. But I really doubt with all the nickel, hot glue, foam, heat shrink (...

ATOPELEC Store, Aliexpress. I bought everything necessary for the welder and battery pack from Aliexpress except the control board and electrodes for the welder and the battery cells, from Paull and Tumich in this forum respectively.

Pack ready Will post some photos in a day or two with the whole bike, only left to complete the housing and mount it on the bike.

Final update :D . My pack is ready and fully operational. Real life always turns out different that the tests.... I made the rust test for all my nickel strips again, but this time I only soak them in salt water solution for about 10 minutes and then left them outside during the night. In the mornin...

Time for update :) My batteries from Tumich just arrived this Saturday! I tested all of them by discharging all of them (4x4) in my SkyRC MC3000 charger from 3.5V to 3.3V at 1A discharge rate. Each cycle took 20 minutes and the process took me a full day. All 150 came in perfect condition, no damage...

☺ I literally hammered them straight in the middle of the copper core, with a hammer. The isolation of the cable is pretty strong and is holding all together.

Just a small update to confirm that I'm able to weld 0.2mm nickel to a battery tab with my single 72Ah car battery. I tested a few different settings and settled on 1.5 - 1 - 10 ms on the controller. Tried with 8 and 9 ms pulse, not strong enough, with 10ms I cannot pry the nickel strip from the tab...

It's great to be able to machine yourself small parts, so useful! There is no machine shops here in Botswana, so I will stick to cable lugs with cut off eye for crimping the cable and electrode....

I like this tip holders, where did you get them? I failed to find anything similar in both Aliexpress and Ebay, or other china online shops.....

I've been following this thread and others for years....cannot believe no one has turned this into a business yet......I've been wanting one of these for a long time now. SMH! :cry: See this thread below. I bought one and I'm very happy with it. Based on JP welder, but much improved. https://endles...

So cool! It looks sexy and powerfull

The board didn't arrive yet. It takes at least a month from UK to Botswana usually. I will report when here

Maybe not the best thread to discuss spot welder strips material, please move to the appropriate place if you think it doesn't belong here.... Looking for different metal strips I found this : https://www.aliexpress.com/store/product/SIZE-6x0-2mm-Leady-Solar-Busbar-Wire-Solder-Connection-Wires/40069...

Sure, the welds are beautifull! No heat buildup on the boards, no cable kicking, very little or no sparks if the electrodes are perpendicular to the tabs. The left is with the default settings, the right one with 8ms second pulse. I only have 0.15mm nickel strip ( pure, tested). I'm able to weld 3 s...

And some more :

Welder completed. I had a faulty invertor getting dust for years and decided to use its box. One of the most annoying things with my first designs was that the weld cables were not fixed to anything stable and the whole system was moving when I was moving the cables, so I just mounted the cable term...

LOL! This looks like a piece of art! Really nice. I forgot to mention that I do not get any heat on the power board, even with rapid (as fast as I can) welding. I believe its not the heat that kills the FETs.

Thanks for the link fechter and Paul, very useful information there! I'm sourcing some 0.3mm nickel, should be OK with even only 2 to 3 connections between the sub packs and I don't have to make many layers.....

Hi guys, Time for me to share my experience with the 6pence spot welder. Below are a few photos that speak more than words, so I will try to be as short as possible. Let me start with special thanks to Paul who was very helpful and assisted me big time with building the power board. The control boar...

Long vacation... Please count me for 1 power board as well.

Hi 6pence followers, Below is my attempt to design a simple Power Board for the 6 pence spot welder working closely with the OP. Not having any education (and relatively little experience) in electronics, but wanting to make one myself I came up with this . All elements dimensions are taken from the...

Hi PGUK,

How can I buy the board from you? I just joined the forum yesterday to be able to PM you, but the message is staying in the outbox....