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  1. dssguy1

    JP spot-welder, FET-switched, timed adj. pulse

    Yep, but the Mosfets were only $6 total.
  2. dssguy1

    JP spot-welder, FET-switched, timed adj. pulse

    You sir, are crazy! I am about to add the FETS that Fechter showed. Mostly because they are a lot cheaper. Do you see any issues with this vs the diode design you are using?
  3. dssguy1

    JP spot-welder, FET-switched, timed adj. pulse

    For the occasional hobby user, Spot Welding .2mm Nickel strips using a 800CA AGM Spiral Wound Optima Red Top battery, will this add-on be helpful? If the answer is yes, I am going to install it just to be safe. Are these the FETs you suggest...
  4. dssguy1

    JP spot welder

    My comments were in reference to anybody thinking they could just strap a welder to a 3D printer for $300-$400 and get similar results as what you have put together. In reference to my comment about some of your welds being off the tabs, I should have said that you were starting to lose your...
  5. dssguy1

    JP spot welder

    I have seen the crater and huge sparks when the surface underneath is not flat. Such as when you might be on the edge of the positive electrode on a battery. I have seen that happen 2 times and both times one electrode was at the edge of the positive side of the battery. not quite over a flat...
  6. dssguy1

    JP spot welder

    How many battery packs are you guys welding that you need robotic equipment? I have a 3D printer and use it a lot. Strapping a spot welder to a carriage, building in appropriate safeguards and then programming your patterns is going to be fairly complicated and most likely take much much longer...
  7. dssguy1

    JP spot welder

    Look up a few posts. I created some 3D printed holders to help build packs. You can make them in any configuration. Worked first print for me.
  8. dssguy1

    JP spot welder

    Guys, I updated my 3D printed spot welding fixtures on Thingiverse. They work really well. I have already made small battery packs using 18650 and AAAs with no issues. Try them out and give me some feedback! http://www.thingiverse.com/thing:1205466
  9. dssguy1

    JP spot welder

    He is using these to connect normal wires to the ends of battery pack by running a nickel strip off the side and then crimping this connector to it and crimping the wire to the other side of this piece.
  10. dssguy1

    JP spot welder

    http://www.optimabatteries.com/en-us/shop/redtop/optima-batteries-8003-151-34r-redtop-starting-battery-reversed-post/ .0030 Ohms I think it is kind of a beast of a battery! Still suggest I try it? I'm only welding .15mm Nickel and have had fine results with my 500-600 CA battery. What is...
  11. dssguy1

    JP spot welder

    I have a RED top Optima battery that is rated at 1000 CA, that is better than my standard 500-600 battery? I don't want to blow up the welder!
  12. dssguy1

    JP spot welder

    So sticking is normal? Just roll the electrode off the strap?
  13. dssguy1

    JP spot welder

    Just got my assembled JP Spot Welder today and hooked it up to a 500 CCA car battery. One small issue with it operationally. The positive electrode keeps sticking to the nickel strip. Not very hard but enough that I have to wiggle free and I can see a difference in the weld. The negative...
  14. dssguy1

    JP spot welder

    Does your country have auto parts stores? They will surely have car batteries.....
  15. dssguy1

    JP spot welder

    +1 If you can't figure out how to buy a 12v car battery.....this may not be the hobby for you.
  16. dssguy1

    JP spot welder

    You could probably just get a long bar magnet and put them all in a row and they should stick to the magnet regardless of pole because they are ferrous metal.
  17. dssguy1

    JP spot welder

    Two ways I guess. 1) The holder doesn't have to be perfect, the magnets will draw the batteries into the holder so as long as you don't have the cradle cutouts too small, they will all touch eachother. 2) If you are using larger batteries than what this cradle holds perfectly, just scale it...
  18. dssguy1

    JP spot welder

    You can do whatever you want but I prefer to tackle my problems with elegance, not metal clamps on thin walled batteries. The magnetic clamp I designed doesn't leave any space. They touch each other before and after being welded.
  19. dssguy1

    JP spot welder

    Here is the model I made to 3D print a battery clamp for about $1 in material. http://www.thingiverse.com/thing:1205466
  20. dssguy1

    JP spot welder

    Do you have any details on a case for this device? I have a 3D printer and could print one if a model existed.
  21. dssguy1

    JP spot welder

    In his video on how to use it, it is on the "Negative" post. The DIY kit shows the PCB with "Battery -" on the mounting location as well. So you may want to delete your above post so as not to confuse people.
  22. dssguy1

    JP spot welder

    I made one to 3D print. I will print it tonight and of my dimensions were right, I will upload it for others to print.
  23. dssguy1

    JP spot welder

    I have purchased my Battery Tender Jrs from Amazon. Bought 3 in the past 5 years and they ranged from $17-$23 for the standard JR model. They also have a high efficiency model that they have to sell in California. I bought that a couple weeks ago figuring it might have more functionality...
  24. dssguy1

    JP spot welder

    I use a Battery Tender Jr, they cost ~$15 and have 6-8 different programs they automatically use to keep a lead acid battery properly charged.
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