JP spot welder

[BYqSXt8Z]

Cmon guys, still available!

Pmed you

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[riba2233]

Ok guys, I've just sold out DIY kits, so I have only about 6 assembled units left.

Get it before it's all gone!

[riba2233]

One more gone, now 5 units left, hurry up!

[tomjasz]

One more gone, now 5 units left, hurry up!

Is two enough, or three too many! What’s the closeout price again? <VBG>
Just sold my unused KWeld needing updates and a fix. With the case and parts I’m eating around $100 of air. That left a bad taste. Kinda unclear how the JP is so simple and still serves users well. Or maybe the KWeld has enough upgrades to keep busier builders a step ahead.

Do you have a set of probes/weld tips? Or maybe I can collect commissions on previous sales and get a deeper discount on one of the 5? <wink>

[Cowardlyduck]

I'm tempted to grab another one as my existing one has been so useful, but the problem is Jakov, you've made it so well it's so reliable, I don't see my existing one breaking anytime soon.

That being said, the SLA I've been using for the last 4 years was getting pretty tired in my last pack build. I propped it up with some old LiPo, which worked for a time, but eventually killed the LiPo.
I had some old NiMH cells lying around from when I changed over my 04 Prius battery a few years back, so I put them into a 2S2P configuration and paralleled with my SLA.

DSC_5615.JPG (144.57 KiB) Viewed 1499 times

DSC_5617.JPG (288.34 KiB) Viewed 1499 times

This should boost the amps noticeably and extend this old SLA at least another year till I am due to get a new SLA in my car.

I also made some new tips out of copper rod as was suggested by others. Using my steel pencil sharpener and drill worked great to get them nice and pointy as you can see above.

Cheers

[tomjasz]

I'm tempted to grab another one as my existing one has been so useful, but the problem is Jakov, you've made it so well it's so reliable, I don't see my existing one breaking anytime soon.


Cheers

Because they're so budget-priced, and reliable I DID add a backup. I'd rather use it then the KWeld I sold for $50.
If I wasn't so short $$'s at the moment I think I'd have pulled the trigger for a third.

[BYqSXt8Z]

Yup, I bought the last 2 diy kits and I'll upgrade those heatsinks... I'll get amazing duty cycle

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[tomjasz]

Yup, I bought the last 2 diy kits and I'll upgrade those heatsinks... I'll get amazing duty cycle

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Which heatsinks will you use?

[cr4west]

Enjoyed reading this form. You all saved me from taking my chances on a used Sunkko 788+ welder.

I'm interested in buying one. Looks like the JP KIT versions may be all gone now. If so I will go for a JP assembled version.
I plan to use lead acid batteries.
Couple questions. (Forgive me if this has already been discussed):
1. Can enough supply batteries be attached to weld copper strip or layered nickel on top of copper strip?
2. Later on could the JB controller be modified to use an AC/DC pulse tig welder as a power supply? The reason I am asking is I saw that video about the guy welding copper strip on Y-tube using a JASIC WSE-200P TIG200P AC/DC TIG/MMA Square Wave Pulse Inverter Welder.

[BYqSXt8Z]

Yup, I bought the last 2 diy kits and I'll upgrade those heatsinks... I'll get amazing duty cycle

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Which heatsinks will you use?

I'll be putting in copper bars where the aluminum bars currently are.

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[BYqSXt8Z]

Yup, I bought the last 2 diy kits and I'll upgrade those heatsinks... I'll get amazing duty cycle

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Which heatsinks will you use?

I'll be putting in copper bars where the aluminum bars currently are. Maybe with some slots in there too.

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[riba2233]

Thank you for kind words guys, the whole idea behind the welder was that is simple, robust and reliable.

Enjoyed reading this form. You all saved me from taking my chances on a used Sunkko 788+ welder.

I'm interested in buying one. Looks like the JP KIT versions may be all gone now. If so I will go for a JP assembled version.
I plan to use lead acid batteries.
Couple questions. (Forgive me if this has already been discussed):
1. Can enough supply batteries be attached to weld copper strip or layered nickel on top of copper strip?
2. Later on could the JB controller be modified to use an AC/DC pulse tig welder as a power supply? The reason I am asking is I saw that video about the guy welding copper strip on Y-tube using a JASIC WSE-200P TIG200P AC/DC TIG/MMA Square Wave Pulse Inverter Welder.

Hey, thank you for your interest!

1. Yes, you can stack nickel strips without any problems! It can weld copper strips up to 0.1 mm, but it's very stochastic and I strongly don't recommend it.

2. I really don't think so. Maybe with some modification on the logic side.

[riba2233]

Only two pieces left! They are packed and ready to ship immediately after receiving payment!

[tomjasz]

Buy two get a discount on the third?

[riba2233]

Buy two get a discount on the third?

PM me!

[riba2233]

All the welders have been sold, big thanks to all of you who have supported me in this last few years!

As a thank you to community I will give you a little surprise later

[BYqSXt8Z]

Depends what polarity, of 12V logic supply no, it has protection diode (if it doesn't work, just reverse the polarity), but don't mix the polarity from the welding battery. Welder goes to the negative pole. If you have any doubts please ask before trying, thanks!

And once I've screwed that up, what do I do?.... Asking for umm.. For a friend

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[riba2233]

Hi guys, just wanted to let you know that I have open sourced the welder design:

viewtopic.php?f=14&t=102681

So this thread can be closed