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  • BobM187 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder3 weeks ago
    DIY Arduino Battery Spot Welder

    Just about done with my first build, just printed the case (and fuse case) in some black PC+PBT, came out pretty nice, though debating whether or not to sand/finish the top and bottom surfaces and apply some some XTC-3D epoxy to make it really shine. Loving this PC+PBT, polycarbonate is incredibly strong, even when 3d printed (tho 3d printed PC isn't stopping nay bullets), even this thin case is extremely hard to break. Just waiting on some crimp ring lugs to finish the electrodes. Was just looking at the new ESP32 boards, these things a pretty cool, and at a great price. For $10 can get one with a 0.96" OLED built right into the dev board. Would be an interesting project ro port this over to one, would probably be easy, make a few adjustments to the control PCB, and change a ...

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    Just about done with my first build, just printed the case (and fuse case) in some black PC+PBT, came out pretty nice, though debating whether or not to sand/finish the top and bottom surfaces and apply some some XTC-3D epoxy to make it really shine. Loving this PC+PBT, polycarbonate is incredibly strong, even when 3d printed (tho 3d printed PC isn't stopping nay bullets), even this thin case is extremely hard to break. Just waiting on some crimp ring lugs to finish the electrodes. Was just looking at the new ESP32 boards, these things a pretty cool, and at a great price. For $10 can get one with a 0.96" OLED built right into the dev board. Would be an interesting project ro port this over to one, would probably be easy, make a few adjustments to the control PCB, and change a little bit of the code, and would probably be in business. Sadly I can't think of any real reason to need wifi or bluetooth (would likely just be some trivial features... BUT, if anyone can think of something useful that Wifi or BT do, please LMK... might motivate me to actually make the port)

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  • BobM187 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder3 weeks ago
    DIY Arduino Battery Spot Welder

    Oh man, Amazon's fail on their "Same day" delivery totally screwed me today (I swear, every time I specifically need the same day delivery, and even buy additional products to reach the $35 minimum of same day items to get it, they seem to fall thru. But every time I couldn't care less whether it was same day or 2 day, it's on time). I can't for the life of me find my M2.5 nuts, and I don't like the loose fitting of the M2 screws in the U plate... waiting for these nuts before I complete that board (everything else is ready to go). So disappointing. And they actually failed on 2 separate orders, both containing the critical items i need to finish 2 projects I was really wanting to today.Anyway, barring some other problem, I should have everything tomorrow... I just hope I ...

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    Oh man, Amazon's fail on their "Same day" delivery totally screwed me today (I swear, every time I specifically need the same day delivery, and even buy additional products to reach the $35 minimum of same day items to get it, they seem to fall thru. But every time I couldn't care less whether it was same day or 2 day, it's on time). I can't for the life of me find my M2.5 nuts, and I don't like the loose fitting of the M2 screws in the U plate... waiting for these nuts before I complete that board (everything else is ready to go). So disappointing. And they actually failed on 2 separate orders, both containing the critical items i need to finish 2 projects I was really wanting to today.Anyway, barring some other problem, I should have everything tomorrow... I just hope I have the time to finish. Looking forward to testing this spot welder. BTW, is there any reason I shouldn't use the M2.5 screws instead of the M2?... seems like they are a perfect fit, and the M2's definitely seem rather loose.

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  • BobM187 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder4 weeks ago
    DIY Arduino Battery Spot Welder

    Haha, that is one of the ones I listed, the one I was thinking about upgrading to. Though, the one I have isn't that much worse (~20% weaker), so might go straight to the super capacitor solution... I might try the super cap with this one, but the welder I really wanna build it for is the kWeld. If you haven't seen/heard about it, it's pretty interesting (IMO), unlike you're style which I've seen repeated a few times (setting pulse times, etc) the kWeld has you set "joules per weld", which as far as I can tell is a somewhat hard thing to do (being able to calculate in real time, and limit something with as much amps going through it for such a short period of time does not seem easy to me). So far it seems like it's a pretty solid unit, I have 1 preordered, will be doing a ...

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    Haha, that is one of the ones I listed, the one I was thinking about upgrading to. Though, the one I have isn't that much worse (~20% weaker), so might go straight to the super capacitor solution... I might try the super cap with this one, but the welder I really wanna build it for is the kWeld. If you haven't seen/heard about it, it's pretty interesting (IMO), unlike you're style which I've seen repeated a few times (setting pulse times, etc) the kWeld has you set "joules per weld", which as far as I can tell is a somewhat hard thing to do (being able to calculate in real time, and limit something with as much amps going through it for such a short period of time does not seem easy to me). So far it seems like it's a pretty solid unit, I have 1 preordered, will be doing a comparison between it, yours, and another similar android based build. Here's a link to a thread talking about it: http://www.eevblog.com/forum/projects/guesses-on-w...Of course I really like the fact that yours is open source, and you promote people getting their own PCBs manufactured (while at the same time offer the PCBs and machines aluminum, as well as everything else, at an incredibly fair, near cost, price... THANK YOU!). I bought 2 boards and aluminum from you (was gonna order from pcbway, tho the 2oz copper jacks up the price a decent amount... but since you offered the aluminum as well, I took the easy way). Just about done building the first one, just need some female headers (was having trouble finding them on arrow, which is where I ordered everything else from)... but have a ~200 piece assortment kit coming from amazon Monday. Planning to build 1 with legit IRFB7430's (from arrow) and one with Chinese copies (ebay) to compare, and see if the Chinese work just as well or not. Next project will be putting together a UniSolder 5.2, about time I upgrade from my Hakko FX-951, looking forward to getting some JBC micro tweezers (and prob the HD and Precision irons as well). Hopefully it won't be that much harder than building this (this was surprisingly easy, really great job on the design).

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  • BobM187 commented on KaeptnBalu's instructable DIY Arduino Battery Spot Welder4 weeks ago
    DIY Arduino Battery Spot Welder

    Is a car battery gonna be better than a high C rated 3S lipo... Already have a 4,000 mAh 60~120 C 3S (Turnigy Heavy Duty)... considering upgrading to a 5,000 mAh 65~130 C 3S (Turnigy Nano-tech) or possibly a 5,400 mAh 65~130C 11.4 (Turnigy Bolt High Voltage LIPO).... unless I can find better. But if need be, will go with a car battery. Also, can this device be ran on a 4S?

    Seems like 2.5mm screws are a better fit than 2mm for the U aluminum (sadly I can't ind my 2.5mm nuts anywhere). Also, is it a good idea to throw some carbon conductive grease between the aluminum and the board?

    Also considering building a bank of super capacitors (for an even stronger welder), tho possible I may make one for this too... but in the meantime... looking for about the strongest battery this can handle.

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  • 79cc Motorized Bicycle From Scratch

    OK, you clearly have some very good points, thank you for the long response. Starting to seriously consider this build... wish I had a workbench I could use for a week, but my current renting situation won't allow that. But I think if I break this into a few different days of work, I should be able to manage. I'm hoping I'm not jumping in too deep on this one, still debating on maybe building a smaller 4 stroke setup first... but you are completely correct about the GEBE kit being pretty damn overpriced. I figure building the engine mount and bracket and getting it on the bike is going to be the hardest part (I hope)... tho also hoping the engine modifications are easy enough, your instructions seem clear enough, but I am no expert on engines. I'm thinking about picking up the engi...

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    OK, you clearly have some very good points, thank you for the long response. Starting to seriously consider this build... wish I had a workbench I could use for a week, but my current renting situation won't allow that. But I think if I break this into a few different days of work, I should be able to manage. I'm hoping I'm not jumping in too deep on this one, still debating on maybe building a smaller 4 stroke setup first... but you are completely correct about the GEBE kit being pretty damn overpriced. I figure building the engine mount and bracket and getting it on the bike is going to be the hardest part (I hope)... tho also hoping the engine modifications are easy enough, your instructions seem clear enough, but I am no expert on engines. I'm thinking about picking up the engine at Harbor freight tomorrow, even if I end up building another kit first, would be good motivation to get this thing going (and thinking it probably makes sense to just build what I want the first time).I suppose the big step now is finding the right bike. There's a ton of used bikes here in the SF Bay Area luckily, but still seeing something that looks like it'll be a good fit (at least not getting any response from people with anything that looks good). But I will keep looking.Thanks again for all the info, hoping I can piece most of the parts this week, and start figuring out how I want to break up the work and tackle this.

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  • 79cc Motorized Bicycle From Scratch

    Man, amazing write up, I am so tempted to try this... but TBH thinking I should maybe do an easier kit (or something closer to a kit build) my first go at motorizing a bicycle.Any recommendations on something a bit easier to get my feet wet... been thinking about maybe starting with a Grubee Aluminum frame (not sure on GTA or GTS yet). I definitely wanna build something with enough power to have some fun, but I'm only 160lbs and traveling on mostly flat land (tho there are some decent hills I'd also like to be able to do)... and would like to at least hit a solid 35mph, 40 would be nice. Is a kit a bad idea, where I should just get the parts separate? or are there some decent kits to get starting. I have an electrical engineering degree, and am good with my hands, but by no means an ...

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    Man, amazing write up, I am so tempted to try this... but TBH thinking I should maybe do an easier kit (or something closer to a kit build) my first go at motorizing a bicycle.Any recommendations on something a bit easier to get my feet wet... been thinking about maybe starting with a Grubee Aluminum frame (not sure on GTA or GTS yet). I definitely wanna build something with enough power to have some fun, but I'm only 160lbs and traveling on mostly flat land (tho there are some decent hills I'd also like to be able to do)... and would like to at least hit a solid 35mph, 40 would be nice. Is a kit a bad idea, where I should just get the parts separate? or are there some decent kits to get starting. I have an electrical engineering degree, and am good with my hands, but by no means an export on motors. Also don't mind spending in the 1k range (more if necessary) for my first go, tho I have a feeling I'll be building a second one very shortly after. Think the Grubee frame would be a good start? any recommendations on what to put on one? I'm hoping to build something like this on maybe my 3rd go (maybe my second if I get balsy), so think 2 steps down from the build you describe here.

    BTW, your 'this' link is not a real link.

    Thanks for the quick response. I'm now thinking about going with a Golden Eagle kit to get me started (they seem a little pricey, but also reliable and easy to build on a wide range of bikes)... then giving this a shot for my second build (I'm just worried about the time and space right now... I am renting, and while my landlord has a TON of tools and would help, sadly he's more into wood work than metal... I don't have a workspace I could take up for a week, let alone a few right now.What I am wondering is, if it would be possible, and if so how hard it would be, if I got the golden eagle mount kit (https://www.bikeengines.com/shop/mount-kit-only-without-the-engine-36-spoke-2/) and tried to attach the 79cc predator to it. I feel like that would be the ideal situation for my first bui...

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    Thanks for the quick response. I'm now thinking about going with a Golden Eagle kit to get me started (they seem a little pricey, but also reliable and easy to build on a wide range of bikes)... then giving this a shot for my second build (I'm just worried about the time and space right now... I am renting, and while my landlord has a TON of tools and would help, sadly he's more into wood work than metal... I don't have a workspace I could take up for a week, let alone a few right now.What I am wondering is, if it would be possible, and if so how hard it would be, if I got the golden eagle mount kit (https://www.bikeengines.com/shop/mount-kit-only-without-the-engine-36-spoke-2/) and tried to attach the 79cc predator to it. I feel like that would be the ideal situation for my first build, with more than enough power... and would get my feet wet enough that this build would likely not seem too hard after doing.

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