Author Topic: Looking for pcb manufacturer who can create pcbs with copper buss bars  (Read 6184 times)

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Offline ahbushnell

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Re: Looking for pcb manufacturer who can create pcbs with copper buss bars
« Reply #25 on: October 07, 2023, 05:45:09 pm »
I have used external busses that mount on a PCB. 

https://forum.digikey.com/t/board-mounted-bus-bar-to-route-big-current/7577

Andy
 

Offline coppercone2

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Re: Looking for pcb manufacturer who can create pcbs with copper buss bars
« Reply #26 on: November 16, 2023, 06:54:27 am »
The kweld is a good design, no doubt about that. Unfortunately its global distribution model is not nearly as good.  And by the time I can get one, its just not worth it.  And its an interesting thing to build somethign new.

So, I'm going to create an 'lweld'.  ( l comes after k. ).  The concept of a constant energy delivery is very solid.  Simple timing is not enough to get reliable operation.      The question of how you deliver constant energy is key to everything.

The Kweld is measuring voltage drop,  which provides a measure of currnet.   Mathematically, you can then derive energy,  as  Power x time..  Obviously the Microprocessor and A/D needs to be doing this pretty quickly, and making a LOT of measurements, in order to get resonable accuracy.     

The actual amount of energy being delivered is not really important.. We just want to be able to deliver the 'same' amount..   so, you can do some experiemental welds, and adjust up and down till dial in on the right weld.   

I dont' want to use batterys for my power supply, I'm intending on use super caps for the job..      Super caps have some interesting charactertics about them, but something we can exploit is the voltage drop between the start of the weld and the desired end of the weld.      This is a job for a comparator.. with a variable set point.   It requires that the SuperCaps are recharged back to the same voltage between charges.      There are jobs that sometimes where an analog solution  is a good fit..    I may have a microprocessor in the mix. but it will be more or less in a supervisory role, and not direclty controlling the weld switch off.

















HOwever its not the

unless its for like a spec reason, I don't recommend this. I think its a great deal... I think they are undervalued, for instance I very easily welded screen material to make a gas diffuser in mine. I thought it was a pricy proposition then I realized how much fucking around it would be to cut like frames out for the screen, join it all together, vs literarly bonding screen material to a bend loop of wire I welded together.

Like I had some various projects a few years back, radio components, etc.. I gave up on those projects because there was so much BS hardware I needed and after making some I was like fuck this, its too much work. But with a spot welder I could have flew through that stuff.


Last time I did screens I
1) had to make 2x aluminum frames
2) braze them together with edge joints (fragile, but good enough)
3) sand it flat
4) sandwich in a screen (vent filter)

Or just any battery replacement job.


IMO, if you want the maximum utility, buy the spot welder, then the part thats worth putting your time in is being able to make various tips for it, like curved tips, parallel electrode, etc. The issue with the spot welder is the interconnect to the work piece. The more you have, the more time and energy you save, and fixturing for the parts so you can put enough pressure on weird objects to spot weld them. I would easily buy a $400 kit of various tips, fixtures, whatever for it.

you might end up with a nice improved machine, but the problem is the damn connection to the work piece, which prevents you from doing alot of work.

for screens I would want a tip that has part ceramic as a brace with a concavity so you can press it on the screen and have the electrode  tip firmly touch the screen, but have the probe mostly rest on a bevel, for centering... that is the kinda weird shit you could make it improve utility. Little anti slip braces and stuff. like stop's/anchors. Very time consuming to make, but if you save on reinventing the wheel, time can be put to that purpose and then magic. Its like machining, where you want all the clamps and cutters and they do you more good then a better machine.
« Last Edit: November 16, 2023, 07:03:13 am by coppercone2 »
 


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